The complete ASE practice test with answers and explanations

Introduction:

Becoming a certified professional in the field of automotive service and repair is a significant milestone in one’s career. The Automotive Service Excellence (ASE) certification is the industry standard, a badge of honor that demonstrates a technician’s expertise and commitment to excellence. However, mastering the ASE exam is no small feat.

It requires not only a deep understanding of automotive principles but also practice and preparation. To aid you in this journey, we present “Master the ASE Certification Exam: The Complete ASE Practice Test with Answers and Explanations.” In this article, we’ve compiled a comprehensive set of ASE practice tests, complete with precise answers and detailed explanations.

In your journey to mastering the ASE Certification Exam, understanding the questions is just one part of the equation. Equally crucial is knowing not just what the correct answers are but why they’re the right choices.

Below, you will discover the practice test, as well as all the quizzes, complete with answers and detailed explanations.

In this section, we go beyond the surface to provide you with insightful explanations. Here, you’ll gain an in-depth understanding of the principles and concepts behind each correct answer.

We believe that true mastery comes not just from rote memorization but from comprehending the ‘why’ behind every ‘what.’

So, let’s dive into the realm of answers and explanations, where knowledge is not just a destination but a well-lit path towards ASE certification success.

Practice Test

1. Which of the following is not a component of a battery?

• a. Electrolyte
• b. Positive Terminal
• c. Negative Terminal
• d. Rotor

Answer: d

Description: The rotor is a component of the alternator, not the battery.

2. The purpose of a voltage regulator is to:

• a. Regulate the engine speed
• b. Regulate the amount of current flowing to the battery
• c. Regulate the air-fuel mixture
• d. Regulate the tire pressure

Answer: b

Description: The voltage regulator regulates the amount of current flowing to the battery to prevent overcharging or undercharging.

3. Which of the following is not a type of electrical circuit?

• a. Series Circuit
• b. Parallel Circuit
• c. Series-Parallel Circuit
• d. Hybrid Circuit

Answer: d

Description: Hybrid circuits are not a recognized type of electrical circuit.

4. A typical alternator produces what type of current?

• a. AC
• b. DC
• c. Both AC and DC
• d. None of the above

Answer: a

Description: A typical alternator produces alternating current (AC).

5. All the following could cause an engine to misfire EXCEP 1:

• a. A faulty spark plug
• b. A clogged fuel injector
• c. A leaking intake manifold gasket
• d. A worn-out serpentine belt

Answer: d. A worn-out serpentine belt is not directly related to engine misfire.

Explanation: A faulty spark plug, clogged fuel injector, and leaking intake manifold gasket can all cause engine misfire. However, a worn-out serpentine belt is not directly related to engine misfire.

6. If a connector in the diagram experiences an open circuit and a 12V battery is connected to the circuit, what will be the outcome if the test light is connected as demonstrated in the figure above?

• a. The test light will light up.
• b. The test light will not light up.
• c. The test light will light up if connected to the motor ground.
• d. The test light will light up if connected to the other side of the connector.

Answer: a. The test light will light up.

Description: According to the provided information, w’hen a 12V battery is connected to a circuit that has an open circuit at the connector, and the test light is connected as shown in the diagram, the test light will indeed illuminate. This is likely due to the fact that the light can complete the circuit through its connection, enabling it to light up. The other options were incorrect based on the information provided.

7. In the diagram provided, the battery is fully charged and the switch is closed, with a voltage drop across the light of 9V as shown by the voltmeter. Technician A suggests that the light might be encountering a high resistance issue. On the other hand, Technician B posits that the circuit might be grounded between the switch and the light. Who among them has the correct diagnosis?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: d. Neither Technician A nor B

Description: The voltage drop across the light being 9V, given a fully charged battery and a closed switch, doesn’t necessarily indicate a high resistance problem in the light (Technician A’s claim) or a grounding issue between the switch and the light (Technician B’s claim). Rather, it might simply reflect the intended operation of the circuit. Without additional information, such as the rated voltage of the light or the specifications of the battery and other circuit components, neither technician’s claim can be verified as correct.

8. What issue is suggested by a subnormal amperage indication when a circuit is put into operation?

• a. A circuit break
• b. A circuit short
• c. Elevated circuit resistance
• d. A busted fuse

Answer: c. Elevated circuit resistance

Description: A lower than normal amperage reading when a circuit is activated typically indicates high resistance in the circuit. High resistance restricts the flow of current, thus resulting in a lower amperage reading. Options A (circuit break) and D (busted fuse) would lead to no current flow at all, and option B (circuit short) would cause a higher amperage than normal, which is not the case here.

9. When using an ohmmeter to inspect the components of a motor circuit, Technician A tests for internal shorts in the motor by connecting the meter across the motor’s ground and case. Meanwhile, Technician B suggests that if there’s no resistance between the power feed (or the most positive point in the circuit) and the motor’s ground, the circuit is in good condition. Who is correct in their procedure?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: a. Only Technician A

Description: Technician A is correct in their procedure of checking for internal shorts in the motor by connecting the ohmmeter across the motor s ground and case. However, Technician B’s statement is not entirely accurate. Zero resistance between the power feed and the motor’s ground does not necessarily indicate a good condition of the entire circuit. Other factors such as the state of the individual components and the integrity of the connections also need to be considered. Therefore, only Technician A’s statement is correct.

10. If the lightbulb doesn’t work in the depicted scenario, with a jumper wire from the battery’s positive terminal to the lightbulb not lighting the bulb, and a jumper wire from the ground side of the bulb to ground lighting the bulb when the switch is on, what could be the possible reason?

• a. A faulty switch causing an open circuit.
• b. An open circuit in the ground of the lightbulb.
• c. An open circuit breaker.
• d. A burned-out fuse.

Answer: b. An open circuit in the ground of the lightbulb.

Description: Given the scenario in which a jumper wire from the battery’s positive terminal to the lightbulb doesn’t illuminate the bulb, but a jumper wire from the ground side of the bulb to the ground does when the switch is on, it indicates that the issue lies in the ground side of the bulb. This means there could be an open circuit in the lightbulb’s ground. The other options such as a faulty switch, open circuit breaker, or a burned-out fuse are less likely as they would either impact the entire circuit or wouldn’t allow the bulb to light under any circumstances.

11. In the given scenario, a lightbulb in a particular setup doesn’t work. A 12V test light, which was installed instead of a fuse, remains on even after disconnecting the connector near the lightbulb. This happens despite the switch being turned on. Technician A believes that the circuit could have a ground short between the fuse and the disconnected connector, while Technician B assumes that there might be an open circuit between the disconnected connector and the lightbulb. Who among them has made the correct diagnosis?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: b. Only Technician B

Explanation: Based on the scenario, if the test light remains on when the switch is turned on, it means that the circuit from the fuse to the disconnected connector is working fine. Hence, Technician A’s claim of a short to ground between the fuse and the disconnected connector doesn’t hold. On the other hand, if the lightbulb doesn’t light up despite the test light is on, it suggests that there could be an open circuit between the disconnected connector and the lightbulb, as Technician B has diagnosed. Therefore, the correct diagnosis is provided by Technician B only.

12. During the battery drain test as illustrated, at what point is the actual battery drain recorded?

• a. When the engine is started or running
• b. Immediately when the switch is opened
• c. When the battery drain reaches 125 milliamperes
• d. When the driver’s door is open

Answer: b. Immediately when the switch is opened

Description: According to the information given, the actual battery drain during the test is recorded as soon as the tester switch is opened. This process does not depend on the engine running, the battery drain reaching a particular level, or the position of the driver’s door.

13. Technician A says that a blocked exhaust system can cause an engine to stall. Technician B says that a defective fuel pump can cause an engine to stall. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both A and B
• d. Neither A nor B

Answer: c. Both A and B

Explanation: A blocked exhaust system can cause backpressure, leading to an engine stall. A defective fuel pump can also cause a stall by not delivering enough fuel to the engine.

14. In a scenario where a circuit breaker is detached from a functioning power seat circuit, and an ohmmeter is affixed to the circuit breaker terminals, who is correct between the two technicians’ opinions? Technician A asserts that a satisfactory circuit breaker should offer an infinite reading on the ohmmeter. Meanwhile, Technician B states that the ohmmeter current might trigger the circuit breaker to open.

• a. Only Technician A is correct.
• b. Only Technician B is correct.
• c. Both Technician A and Technician B are correct.
• d. Neither Technician A nor Technician B are correct.

Answer: a.Only Technician A is correct.

Explanation: A functioning circuit breaker removed from the circuit should indeed provide an infinite reading on the ohmmeter because there’s no current flowing through it. Therefore, Technician A is correct. On the other hand, the ohmmeter’s current, which is very minimal, would typically not be enough to cause a circuit breaker to open. Hence, Technician B is incorrect.

15. What does the symbol depicted in the diagram represent?

• a. diode
• b. resistor
• c. capacitor
• d. inductor

Answer: This answer can’t be determined without the referred drawing or diagram.

Description: The answer is dependent on the symbol depicted in the diagram. Each option corresponds to a specific electronic component, each with a unique symbol. A diode typically has a triangle pointing towards a line, a resistor is generally represented by a jagged line, a capacitor usually has two parallel lines, and an inductor is often symbolized by a series of curved or looped lines. The correct answer depends on the symbol presented in the drawing.

16. What is the correct way to adjust a battery hydrometer reading based on temperature?

• a. Subtract 0.020 from the hydrometer reading if the battery temperature is 7O°F (21.1°C)
• b. Subtract 0.050 from the hydrometer reading if the battery temperature is o°F (-17.7°C)
• c. Add 0.050 to the hydrometer reading if the battery temperature is 12O°F (48.9°C)
• d. No adjustment is needed for the hydrometer reading regardless of the temperature.

Answer: b. Subtract 0.050 from the hydrometer reading if the battery temperature is o°F (-17.7°C)

Description: According to the information provided, when performing a battery hydrometer test, the hydrometer reading should be adjusted based on the temperature of the battery. If the battery temperature is o°F (-17-7°C), 0.050 should be subtracted from the hydrometer reading. This adjustment is essential to ensure the accuracy of the test results.

17. In a discussion about a battery capacity test conducted at a temperature of 70T (2i.x°C), which of the following statements is accurate?

• a. Technician A’s statement that the batteiy discharge rate can be calculated by doubling the battery’s reserve - capacity rating.
• b. Technician B’s assertion that a battery is satisfactory if its voltage stays above 9.6 V.
• c. Both Technician A and Technician B are correct.
• d. Neither Technician A nor Technician B made correct - statements.

Answer: b. Technician B’s assertion that a battery is satisfactory if its voltage stays above 9.6V.

Description: The correct answer is Technician B’s assertion that a battery is satisfactory if its voltage stays above 9.6V. This is because, during a battery capacity test, it is generally accepted that a battery is working properly if its voltage remains above 9.6 volts. On the other hand, Technician A’s statement about the battery discharge rate calculation is incorrect. The discharge rate of a battery cannot be determined merely by doubling the battery’s reserve capacity rating; it involves a more complex calculation related to the battery’s chemical composition and other factors.

18. What is the LEAST likely cause of an engine misfire?

• a. A faulty spark plug
• b. A clogged fuel injector
• c. A damaged ignition coil
• d. A malfunctioning EGR valve

Answer: d. A malfunctioning EGR valve

Explanation: Although a malfunctioning EGR valve can cause a variety of engine problems, it is the least likely cause of an engine misfire.

19. What might happen if the battery voltage is disconnected from the electrical system of a vehicle that has numerous on-board computers?

• a. All of the computers may become damaged.
• b. The vehicle’s engine may fail to start.
• c. The adaptive memories of the computers may be erased.
• d. Voltage surges might occur in the electrical system.

Answer: c. The adaptive memories of the computers maybe erased.

Explanation: Disconnecting the battery voltage from a vehicle’s electrical system, especially in vehicles with multiple on-board computers, can result in the erasure of the computers’ adaptive memories. This is because these memories often rely on continuous power to maintain stored information. While options (a), (b), and (d) could possibly occur under certain circumstances, they are not the most typical consequences of disconnecting the battery voltage.

20. While inspecting a battery, considerable dirt and corrosion are observed on the battery case, hold-downs, and terminals. Technician A suggests this could lead to battery drain, while Technician B asserts that the battery must be leaking and hence, needs replacement. Who among them is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: a. Technician A only

Explanation: The buildup of dirt and corrosion on the battery case, hold-downs, and terminals can indeed lead to a battery drain, as suggested by Technician A. This is because the corrosion can increase resistance in the battery connections, leading to inefficient battery use and potential drain. On the other hand, the presence of dirt and corrosion does not necessarily mean that the battery is leaking and needs replacement, as suggested by Technician B. While a leaking battery may cause such issues, these signs could simply indicate poor maintenance or a high-humidity environment, among other possibilities. Therefore, without further evidence of leaking, Technician B’s assertion is not necessarily correct.

21. When fast charging a battery, Technician A uses a voltmeter to ensure the voltage doesn’t exceed 15.5 volts, while Technician B monitors the battery’s temperature, ready to decrease the charging rate when the temperature gets close to 125°F. Who is using the correct procedure?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Explanation: Both technicians are employing sound battery management practices. Technician A is using a voltmeter to make sure the voltage doesn’t exceed 15.5 volts, which is important to prevent overvoltage and potential damage to the battery. Similarly, Technician B is watching the battery’s temperature and is ready to adjust the charging rate if it nears 125°F. This is crucial to prevent overheating, which can also damage the battery or even lead to a fire. Therefore, both Technician A and Technician B are correct in their respective practices.

22. During the process of jump-starting a car using another vehicle as a booster, Technician A suggests that the accessories in the booster vehicle should be switched “on” during the start-up of the vehicle being jump-started. On the other hand, Technician B asserts that the negative booster cable ought to be connected to the engine ground on the vehicle that is receiving the jump-start. Who among them is correct?

• a. Technician A alone is correct
• b. Technician B alone is correct
• c. Both Technician A and Technician B are correct
• d. Neither Technician A nor Technician B is correct

Answer: b. Technician B alone is correct

Description: The accessories in the booster vehicle should not be on when jump¬starting another vehicle, as this might result in potential damage to those accessories due to voltage variations. Therefore, 1 technician A’s claim is not correct. However, Technician B is correct as the negative booster cable should be connected to an engine ground on the vehicle being boosted. This ensures a good electrical connection and minimizes the risk of sparking, which can be potentially hazardous.

23. What is the LEAST likely cause of a rough idle?

• a. A clogged air filter
• b. A malfunctioning throttle position sensor
• c. A faulty oxygen sensor
• d. A worn timing belt

Answer: d. A worn timing belt

Explanation: Although a worn timing belt can cause engine problems, it is the least likely cause of a rough idle.

24. Technician A proposes that a battery terminal test is conducted by connecting voltmeter leads between the positive battery post and the negative battery terminal. On the other hand, Technician B believes that the state of the terminal can be assessed by evaluating the voltage drop from the negative battery post to the negative battery terminal. Who has the correct approach?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: b. Only Technician B

Description: The correct answer is “b. Only Technician B’. Technician B is right as assessing the terminal condition by measuring the voltage drop between the negative battery post and the negative battery terminal is a common method used. The voltage drop test can help to identify resistance in an electrical circuit. Technician A’s approach, however, is not correct as connecting the voltmeter leads directly between the positive and negative battery terminals is a way to test the battery’s voltage, not specifically the terminal condition.

25. During a current draw test on a starter, if you observe that the current draw exceeds the specified amount, while the cranking speed and battery voltages are below the specified levels, what could be a probable reason for this issue?

• a. The starter motor has degraded bushings.
• b. There is high resistance in the field windings.
• c. The battery-positive cable is presenting high - resistance.
• d. The solenoid disc and terminals have been burnt.

Answer: a. The starter motor has degraded bushings.

Description: High current draw combined with low cranking speed and battery voltages can indicate mechanical resistance to rotation. This can be due to worn bushings in the starter motor. Worn bushings can increase friction, causing the motor to work harder (draw more current) and slow down the cranking speed. The other options do not adequately explain the combination of symptoms as they primarily relate to electrical resistance, not mechanical, which wouldn’t typically result in an increased current draw and decreased cranking speed.

26. In the given diagram, the voltmeter is being utilized to examine the voltage decrease across which component?

• a. positive battery wire.
• b. starter solenoid coils.
• c. starter earth circuit.
• d. starter solenoid disk and terminals.

Answer: d. starter solenoid disk and terminals.

Description: In the provided scenario, the voltmeter is connected to monitor the voltage drop across the starter solenoid disk and terminals. This helps in determining if there’s an appropriate voltage supply for the starter solenoid to operate effectively.

27. Upon switching the ignition to the “start” position, a voltmeter attached to the starter solenoid’s battery and motor terminals registers 12 volts. The solenoid emits a clear click, yet the starter doesn’t turn. Technician A believes the circuit between the battery and the starter solenoid has an excessive voltage drop. Technician B insists the starter solenoid must be replaced. Who has the correct diagnosis?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: b. Only Technician B

Description: Given that the voltmeter reads 12 volts (which is a normal reading for a car battery) when the ignition switch is turned to the “start” position, this suggests that there is no excessive voltage drop in the circuit, making Technician A’s statement incorrect. The fact that a click is heard from the solenoid but the starter does not rotate could suggest that the solenoid is faulty, supporting Technician B’s diagnosis. Hence, only Technician B is correct.

28. A car is brought into the auto repair shop because it won’t crank and there is no noise from the solenoid. The mechanic switches on the headlights and attempts to start the car. The headlights remain just as bright and the issue is confirmed. Which of the following is least likely to be causing the problem?

• a. The battery is not fully charged.
• b. The clutch switch is malfunctioning.
• c. The starter motor is defective.
• d. 1 here’s an open circuit in the starter system.

Answer: a. The battery is not fully charged.

Description: When the technician turned the ignition to the “start” position, the brightness of the headlights did not change. If the battery were undercharged, the load of the starter motor would have resulted in the headlights dimming. Therefore, an undercharged battery is least likely to be the problem in this scenario. Options b, c, and d could potentially cause a no-crank/no sound from the solenoid issue without affecting the brightness of the headlights.

29. A rebuilt starter motor is ready to be installed in a vehicle. Technician A suggests performing a free spin test prior to installation, while Technician B recommends removing the terminal connector to the starter field coils for easier inspection of the pinion flywheel clearance. Who provides the correct advice?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both technicians are offering valid advice in their own respect. Technician A’s suggestion to perform a free spin test before installing the starter ensures that the motor is operating correctly, and this can prevent any possible failures or issues once it’s installed. Technician B’s advice to remove the terminal connector to the starter field coils before installation facilitates the checking of the pinion flywheel clearance. This is important as an improper clearance could cause damage to the starter or the engine flywheel.

30. When a customer reports a non-starting engine, two technicians propose different initial checks. Technician A suggests manually turning the crankshaft pulley nut to verify if the engine turns over, while Technician B recommends evaluating the condition of the battery first. Whose approach is correct?

• a. Only Technician A
• b. Only Technician B
• c. Both Technician A and B
• d. Neither Technician A nor B”

Answer: b. Only Technician B

Explanation: While both the engine crankshaft and battery are vital components when starting a car, the first basic check should be the condition of the battery. A faulty or discharged battery is one of the most common reasons an engine won’t turn over. Technician B’s approach is thus more accurate in this case. I echnician A’s method could also be useful in diagnosing certain problems, but it’s not typically the first step in troubleshooting this issue.

31. When discussing an alternator with zero output, Technician A says the alternator field circuit may have an open circuit. Technician B says the fuse link may be open in the alternator to the battery wire. Which technician is correct?

• a. Technician A
• b. Technician B
• c. Both Technicians A and B
• d. Neither Technician A nor B

Answer: c. Both technicians A and B

Description: Technician A is correct because if the alternator field circuit has an open circuit, it can result in zero output from the alternator. I echnician B is also correct because if the fuse link in the alternator to the battery wire is open, it can prevent the flow of current and result in zero output from the alternator. Therefore, both technicians A and B are correct in their statements.

32. Which of the following statements about using a lab scope for diagnosis is correct EXCEPT?

• a. An upward movement of the trace means the voltage has increased and a downward movement means the voltage has decreased.
• b. The size and clarity of the trace are dependent on the cleanness of the connection and the component or circuit being tested.
• c. A flat waveform means the voltage is staying at that level.
• d. As the trace moves across the screen of the oscilloscope, frequency is represented.

Answer: d.

As the trace moves across the screen of the oscilloscope, frequency is represented. Description: Option D is incorrect because it states that as the trace moves across the screen of the oscilloscope, frequency is represented. In reality, as the trace moves across the screen, time is represented, not frequency. The horizontal axis of the oscilloscope represents time, while the vertical axis represents voltage.

33. Test results of a voltage output test are being discussed. Technician A says if the charging system is too high, there may be a loose or glazed drive belt. Technician B says if the charging system was too low, the fault might be a grounded field wire from the regulator (full fielding the alternator). Who is right?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B are correct in their statements. Technician A is correct because a loose or glazed drive belt can cause the charging system to become too high. If the belt slips or loses tension, it may not rotate the alternator pulley effectively, resulting in insufficient charging. This can lead to an overcharged or high-voltage output. Technician B is also correct because a grounded field wire from the regulator can cause the charging system to become too low. The field wire is responsible for controlling the output of the alternator. If it becomes grounded, it can bypass the regulator’s control and force the alternator to operate at full field, producing a low voltage output. Therefore, both technicians provide valid explanations for the possible causes of high and low voltage outputs in the charging system.

34. Which of the following could be the cause of a low alternator output during an output test using the full-field method for a 100-ampere alternator with an integral regulator?

• a. A shorted diode in the alternator.
• b. A broken brush lead wire in the alternator.
• c. An open circuit in the voltage regulator.
• d. A defective alternator capacitor.

Answer: c. An open circuit in the voltage regulator.

Description: In an alternator with an integral regulator, the voltage regulator is responsible for regulating the output of the alternator. If there is an open circuit in the voltage regulator, it can prevent the alternator from producing its full output. This can result in a low alternator output, such as the 60 amperes observed in the given scenario. A shorted diode in the alternator (option A), a broken brush lead wire in the alternator (option B), or a defective alternator capacitor (option D) may cause other issues, but they are not directly related to the low alternator output in this case.

35. The charging system voltage on a vehicle is 16.2V. Which of the following problems is likely to occur due to this condition EXCEPT?

• a. An undercharged battery.
• b. Burned-out electrical components.
• c. Electrolyte gassing in the battery.
• d. Reduced headlight brilliance.

Answer: a. An undercharged battery.

Description: When the charging system voltage on a vehicle is 16.2V, it is considered to be an overcharged battery condition. This high voltage can cause various issues, including burned-out electrical components, electrolyte gassing in the battery, and reduced headlight brilliance. However, it is unlikely to result in an undercharged battery, as the voltage is above the normal range for charging.

36. A vehicle’s batteiy discharges in a very short period of time due to a shorted cell. Before replacing the battery, a charging system test is performed. The engine is started and all accessories are turned off. Technician A says the charging system’s amperage output will be lower than normal. Technician B says the generator’s field current will be high when the engine is running. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B are correct. Technician A is correct because when a vehicle’s battery has a shorted cell, it will discharge quickly. As a result, the charging system’s amperage output will be lower than normal because the battery cannot hold a charge efficiently. Technician B is also correct because when the engine is running, and the battery needs to be charged, the generator’s field current will be high. This is necessary to generate a sufficient electrical current to charge the battery and power the vehicle’s electrical systems. Therefore, both technicians are correct in their statements.

37. Charging system voltage is being measured at two places simultaneously. Connecting the voltmeter’s leads across the batteiy results in a reading of 12.8 volts, while connecting the voltmeter to the generator output terminal and the case results in a reading of 14.2 volts. Technician A says there may be excessive resistance on the ground side of the charging system. Technician B says there may be excessive resistance on the positive side of the charging system. Who is right?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B are correct in their assessments. The voltage drop across the charging system components suggests that there is excessive resistance on both the ground side and the positive side. Excessive resistance on the ground side can prevent the battery from receiving the full charging voltage, leading to a lower reading when measured directly across the battery. Excessive resistance on the positive side can cause a voltage drop between the generator output terminal and the battery, resulting in a higher reading when measured at the generator output terminal. Therefore, both A and B are correct. The question pertains to a charging system in a drawing, where a charge indicator bulb is at full brilliance with the engine running. An alternator output test indicates satisfactory output. Two technicians, A and B, provide possible explanations for the issue.

38. Technician A suggests that there may be an opening in the wire from the alternator battery terminal to the battery-positive terminal. Technician B proposes that there may be an opening in the wire from regulator terminal #1 to the charge indicator bulb. Which technician is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: b.Technician B only

Description: Technician B is correct in this scenario. If the charge indicator bulb is at full brilliance with the engine running, it indicates that the bulb is receiving voltage from regulator terminal #1. Therefore, if there is an opening in the wire connecting regulator terminal #1 to the charge indicator bulb, it would result in the bulb being constantly illuminated. Technician A’s explanation is incorrect because if there was an opening in the wire from the alternator battery terminal to the battery-positive terminal, it would result in no charging at all, leading to a discharged battery.

39. When testing diodes, what meter readings can be expected when the ohmmeter leads are connected across a satisfactory diode and then reversed?

• a. One high meter reading and one low meter reading.
• b. Two-meter readings of infinity.
• c. Two low meter readings.
• d. A meter reading of 2 ohms and 40 ohms.

Answer: b. Two-meter readings of infinity.

Description: When testing a satisfactory diode, the ohmmeter leads should be connected across the diode and then reversed. In this case, two-meter readings of infinity (or open circuit) are expected. This indicates that the diode is functioning correctly by allowing current to flow in one direction (forward-biased) and blocking it in the reverse direction (reverse-biased).

40. The headlights on a vehicle go out intermittently and come back on in a few minutes. Technician A says this problem may be caused by an intermittent short to ground. Technician B says this problem maybe caused by a faulty hi adlight switch. Who is right?

• a. A only
• b. B only
• c. Both A and B
• d. Neither A nor B

Answer: b only

Description: 1 echnician B is correct. The intermittent loss and restoration of the headlights are more likely to be caused by a faulty headlight switch rather than an intermittent short to ground. The headlight switch controls the flow of electricity to the headlights, so if it is malfunctioning, it can cause the headlights to turn off and on intermittently. Technician A’s suggestion of an intermittent short to ground is not a probable cause for this specific issue.

41. Which of the following statements about halogen headlight bulb replacement is NOT true?

• a. Handle the halogen bulb only by the base.
• b. Do not drop or scratch the bulb.
• c. Change the bulb with the headlights on.
• d. Keep moisture away from the bulb.

Answer: c

Description: The correct answer is C. The statement “change the bulb with the headlights on” is not true. When replacing a halogen headlight bulb, it is important to turn off the headlights before attempting to change the bulb to avoid the risk of electrical shock or damage to the bulb. Therefore, all the other statements (A, B, and D) are true and should be followed when replacing a halogen headlight bulb.

42. If fuse S in the circuit shown is open, what would be the consequence?

• a. Inoperative taillights
• b. Inoperative stoplights
• c. Inoperative instrument cluster lights
• d. Inoperative low-beam headlights

Answer: b. Inoperative stoplights

Description: If fuse S in the circuit shown is open, it would result in the inoperative stoplights. Fuses are safety devices designed to protect electrical circuits from excessive current flow. When a fuse is open (blown), it breaks the circuit and prevents the flow of electricity to the components connected to that circuit. In this case, the open fuse S would interrupt the circuit responsible for powering the stoplights, rendering them inoperative.

43. What is the LEAST likely cause for an inoperative retractable headlight door?

• a. A defective headlight motor
• b. Loose or broken vacuum lines
• c. A poor headlamp ground
• d. A faulty limit switch

Answer: c. A poor headlamp ground

Description: The least likely cause for an inoperative retractable headlight door is poor headlamp ground. Headlamp ground issues typically affect the functionality of the headlight itself and may cause flickering or improper lighting. I lowever, when it comes to the retractable headlight door, other factors such as a defective headlight motor, loose or broken vacuum lines, or a faulty limit switch are more likely to be the cause. These components directly control the movement and operation of the headlight door.

44. When diagnosing nonfunctional daytime running lights, Technician A checks the circuit between the headlamp switch and the control module, while Technician B starts by checking the vehicle’s high-beam lamps. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: a. Technician A only

Description: Technician A is correct. When diagnosing nonfunctional daytime running lights, it is important to check the circuit between the headlamp switch and the control module to ensure proper functionality. Technician B’s approach of checking the vehicle’s high-beam lamps is not directly relevant to diagnosing nonfunctional daytime running lights.

45. A vehicle has one dim taillight, and the other taillights have normal brilliance. Technician A says the dim taillight might have a high resistance between itself and the ground. Technician B says there might be a defect in the taillight contacts in the headlight switch. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B could be correct in this scenario. Technician A suggests that there might be high resistance between the dim taillight and the ground, which could result in reduced brightness. This can happen due to a poor connection or a faulty ground wire. Technician B proposes that there might be a defect in the taillight contacts in the headlight switch. If there is a problem with the contacts, it could prevent the full voltage from reaching the dim taillight, causing it to appear dimmer than the others. Therefore, both technicians’ explanations are plausible and could contribute to the dimness of the taillight.

46. Which of the following issues could result from the open circuit in the rear light ground connection on the left side of the figure?

• a. Inoperative LR taillight, stop light, and side marker lights.
• b. No change in the operation of the rear lights.
• c. Inoperative LR tail and stoplights only.
• d. Inoperative backup lights.

Answer: a. Inoperative LR taillight, stop light, and side marker lights.

Description: An open circuit in the rear light ground connection on the left side would cause a loss of electrical continuity. As a result, the LR (left rear) taillight, stop light, and side marker lights would not receive the necessary electrical ground, rendering them inoperative. The ground connection on the right side of the figure is satisfactory, meaning the lights connected to it should still function properly. However, the LR lights on the left side would be affected by the open circuit. Therefore, option A is the correct answer.

47. lhe instrument cluster bulbs are completely inoperative. Technician A says one of the instrument cluster bulbs might have an open circuit. Technician B says the rheostat in the headlight switch might have an open circuit. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: In this scenario, both Technician A and Technician B are correct. When the instrument cluster bulbs are completely inoperative, it indicates a problem with the electrical circuit. Technician A suggests that one of the instrument cluster bulbs might have an open circuit, which means there is a break in the electrical path, preventing current from flowing. Technician B proposes that the rheostat in the headlight switch might have an open circuit. The rheostat controls the brightness of the instrument cluster bulbs, so if it has an open circuit, it can cause the bulbs to be inoperative. Therefore, both technicians’ explanations are valid and contribute to the diagnosis of the issue.

48. What is the most likely cause of the intermittent on-and-off behavior of all the instrument cluster bulbs while driving the vehicle?

• a. Loose connection of one instrument cluster bulb in the printed circuit board.
• b. Intermittent open in the ground circuit of the instrument cluster.
• c. Grounded circuit between the rheostat and the instrument cluster bulbs.
• d. Defective circuit breaker in the instrument light circuit.

Answer: b. Intermittent open in the ground circuit of the instrument cluster.

Description: The most likely cause of the problem is an intermittent opening in the ground circuit of the instrument cluster. This means that there is a disruption or break in the connection between the instrument cluster and its grounding point, causing the bulbs to intermittently turn on and off while driving. This issue should be addressed by inspecting and repairing the ground circuit to ensure a proper and consistent electrical connection.

49. Which of the following could be the cause of the courtesy lights being completely inoperative in a courtesy light circuit with insulated side doorjamb switches?

• a. An open circuit in one doorjamb switch.
• b. An open circuit between the fuse and the doorjamb switches.
• c. A grounded circuit in one of the doorjamb switches.
• d. A grounded circuit between the doorjamb switches and the bulbs.

Answer: a. An open circuit in one doorjamb switch.

Description: In a courtesy light circuit with insulated side doorjamb switches, if the courtesy lights are completely inoperative and the courtesy light fuse is not blown, the likely cause of the problem is an open circuit in one door jamb switch. An open circuit means that there is a break or interruption in the electrical path, preventing current flow.

50. The purpose of a powertrain control module (PCM) is to:

• a. Control the operation of the engine and transmission
• b. Control the operation of the suspension
• c. Control the operation of the brakes
• d. All of the above

Answer: a.

Description: The powertrain control module (PCM) is responsible for controlling the operation of the engine and transmission.

51. The purpose of an antilock brake system (ABS) is to:

• a. Prevent skidding during braking
• b. Improve fuel economy
• c. Improve engine performance
• d. None of the above

Answer: a.

Description: An antilock brake system (ABS) is designed to prevent skidding during braking by automatically adjusting the braking pressure at each wheel.

52. What is the potential outcome of circuit 156 being shorted to ground at terminal splice 5363?

• a. Continual operation of the courtesy lights.
• b. No operation of the courtesy lights and lighted mirror.
• c. Continual operation of the under-hood light.
• d. A burned-out courtesy light fuse.

Answer: b. No operation of the courtesy lights and lighted mirror.

Description: When circuit 156 is shorted to ground at terminal splice 5363, it will result in the absence of operation for both the courtesy lights and the lighted mirror. This means that neither the courtesy lights nor the lighted mirror will function as expected.

53. While diagnosing an instrument panel lighting circuit, Technician A says the power source for the lamps is provided through the headlight switch and/or a rheostat. Technician B says all printed circuit boards should be replaced if they are faulty and cannot be repaired. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: a. Technician A only

Description: In this scenario, Technician A is correct. The power source for the lamps in an instrument panel lighting circuit can be provided through the headlight switch and/or a rheostat. This allows for control and adjustment of the panel lighting. Technician B, on the other hand, is incorrect. Not all faulty printed circuit boards need to be replaced; some can be repaired depending on the specific issue.

54. Which of the following could cause premature failure of a composite bulb, EXCEPT?

• a. High charging voltage.
• b. Excessive resistance in the bulb ground circuit.
• c. Improper bulb installation.
• d. Cracked lamp cover or housing.

Answer: c. Improper bulb installation.

Description: Improper bulb installation can lead to premature failure of a composite bulb. If the bulb is not properly installed, it may not be seated correctly or securely in the socket, causing poor electrical connections. This can result in increased resistance, excessive heat, and ultimately, the failure of the bulb. High charging voltage (option A) can also cause premature failure by overloading the bulb, excessive resistance in the bulb ground circuit (option B) can lead to insufficient current flow and bulb failure, and a cracked lamp cover or housing (option D) can expose the bulb to the elements, causing damage and premature failure. However, out of the given options, improper bulb installation (option C) is the most likely cause of premature failure.

55. The left turn signals of a vehicle are flashing very slowly; the right turn signals are operating correctly. Technician A says excessive circuit resistance in the left turn signal circuit may cause the problem. Technician B says this problem may have occurred because someone installed a bulb with higher-than-normal wattage ratings on the left side of the vehicle. Who is correct?

• a. Technician A
• b. Technician B
• c. Both Technician A and B
• d. Neither Technician A nor B"

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B are correct. Slow flashing of the left turn signals can be caused by excessive circuit resistance, which can impede the proper flow of electrical current. This can occur due to loose connections, corroded terminals, or damaged wiring. Additionally, if someone installed a bulb with a higher wattage rating than normal on the left side of the vehicle, it can disrupt the electrical balance and cause the turn signals to flash slowly. Iherefore, both excessive circuit resistance and a higher wattage bulb can contribute to the problem of slow flashing left turn signals.

56. Which of the following is the most likely cause of the dim right rear signal light in the signal light circuit depicted in the figure?

• a. High resistance in the DB 180G RD wire from the signal light switch to the rear lamp wiring.
• b. A short to ground in the DB 180G RD wire from the signal light switch to the rear lamp wiring.
• c. High resistance in the D7 18BR RD wire from the signal light switch to the rear lamp wiring.
• d. High resistance in the DZ 18 RD wire from the signal light flasher to the switch.

Answer: a. High resistance in the DB 180G RD wire from the signal light switch to the rear lamp wiring.

Description: The most likely cause of the dim right rear signal light in the signal light circuit is a high resistance in the DB 180G RD wire from the signal light switch to the rear lamp wiring. High resistance in a wire can result in reduced electrical current flow, leading to dim light. The other options (B, C, and D) do not directly address the issue of a dim light in the right rear signal light and are therefore less likely to be the cause.

57. Which of the following could be the cause of the inoperative backup lights, given that the voltage measured on both sides of the backup lightbulbs is 12V with the gear selector in reverse and the ignition switch on?

• a. Shorted filaments in the backup lightbulbs.
• b. An open circuit between the backup lights and ground.
• c. High resistance in the backup light switch contacts.
• d. The wire from the backup switch to the bulbs is shorted to 12V.

Answer: b. An open circuit between the backup lights and ground.

Description: If the voltage measured on both sides of the backup lightbulbs is 12V, it indicates that power is reaching the bulbs. However, since the lights are inoperative, the problem lies in the return path or ground circuit. Option B suggests that there is an open circuit between the backup lights and ground, meaning that the circuit is not completing properly and preventing the lights from functioning. This could be due to a broken wire, a loose connection, or a faulty ground connection. The other options (A, C, and D) do not address the issue of a missing ground connection and are therefore less likely to be the cause of the problem.

58. Which technician is correct about the consequences of the right-hand backup light circuit being grounded on the switch side of the bulb? lechnician A says this condition may cause the backup light fuse to fail. Technician B says the left-hand backup light may work normally while the right-hand backup light is inoperative.

• a. Technician A
• b. Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B are correct. When the right¬hand backup light circuit is grounded on the switch side of the bulb, it can cause the backup light fuse to fail (as stated by Technician A). Additionally, the left¬hand backup light may still work normally while the right-hand backup light is inoperative (as stated by Technician B). Therefore, both technicians are right in their statements.

59. Which of the following could be the cause of the fuel gauge continuously reading full when the ignition switch is on?

• a. High resistance in the sending unit ground wire.
• b. High resistance between the instrument voltage regulator and the gauge.
• c. A short to ground between the gauge and the sending unit.
• d. An open circuit in the wire from the gauge to the sending unit.

Answer: c. A short to ground between the gauge and the sending unit.

Description: The most likely cause of the fuel gauge continuously reading full when the ignition switch is on is a short to ground between the gauge and the sending unit. A short to ground creates a direct path for electrical current to flow, bypassing the resistance that the gauge relies on to accurately measure the fuel level. This results in the gauge constantly showing a full reading.

60. In a vehicle instrument cluster with thermal-electric gauges and an instrument voltage limiter, all the gauges are erratic. Which technician’s statement is correct?

• a. Technician A: The alternator may be defective.
• b. Technician B: The instrument voltage limiter may be defective.
• c. Both Technician A and Technician B are correct.
• d. Neither Technician A nor Technician B is correct.

Answer: c. Both Technician A and Technician B are correct.

Description: In this scenario, both Technician A and Technician B are correct. The erratic behavior of all the gauges in the instrument cluster suggests a problem with the electrical system. Technician A suggests that the alternator may be defective, which is a valid possibility as the alternator is responsible for charging the battery and providing electrical power to the vehicle. Technician B suggests that the instrument voltage limiter may be defective, and this is also a plausible explanation since the instrument voltage limiter regulates the voltage supplied to the instrument cluster. Therefore, both Technician A and Technician B could be right in this situation.

61. Which component should be tested to correct the problem of unilluminated segments in the fuel gauge during the initial display on a digital instrument cluster?

• a. The fuel gauge segments
• b. The fuel gauge circuit from the gauge to the sending unit
• c. The digital instrument display
• d. The instrument voltage limiter

Answer: b. The fuel gauge circuit from the gauge to the sending unit

Description: To correct the problem of unilluminated segments in the fuel gauge, it is recommended to test the fuel gauge circuit from the gauge to the sending unit. This test will help identify any potential issues in the circuit that may be causing the problem. Options A, C, and D are not the most appropriate solutions based on the given information.

62. A digital speedometer constantly reads zero mph. Technician A says a faulty speed sensor may cause the problem. Technician B says the cause maybe an open throttle position sensor. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B are correct in this scenario. A faulty speed sensor can indeed cause the digital speedometer to constantly read zero inph. The speed sensor provides the necessary input for the speedometer to display the correct speed. If the sensor is faulty or not sending any signals, the speedometer will not receive any data and will remain at zero. Similarly, an open throttle position sensor can also cause the speedometer to read zero mph. The throttle position sensor measures the position of the throttle valve and sends this information to the engine control module. If the sensor is open or not functioning properly, it can affect the overall engine performance, including the speedometer reading. Therefore, both technicians are correct in their assessments.

63. Which of the following CANNOT cause the vehicle’s warning lights not to work?

• a. A burned-out bulb.
• b. A short to ground in the sending unit circuit.
• c. An open in the sending unit circuit.
• d. A disconnected battery.

Answer: d. A disconnected battery.

Description: A disconnected battery does not directly affect the vehicle’s warning lights. The warning lights are typically powered by the vehicle’s electrical system, and even if the battery is disconnected, the warning lights can still function as long as the vehicle’s electrical system is operational. On the other hand, options A, B, and C (burned-out bulb, short to ground, and open in the sending unit circuit) can all disrupt the electrical circuitry necessary for the warning lights to function properly.

64. While diagnosing the cause of a chime (audible warning) that intermittently and unpredictably sounds, Technician A says the problem could be caused by an opening in the circuit to the warning chime. Technician B suspects that the switch circuit may be shorted to ground. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B could be correct in this scenario. An intermittent and unpredictable chime could be caused by an opening in the circuit to the warning chime, as suggested by Technician A. This means that the circuit is not properly closed, resulting in sporadic chime activation. On the othei hand, Technician B s suspicion that the switch circuit may be shorted to the ground is also valid. If the switch circuit is indeed shorted to ground, it can create a continuous path for the electrical current, leading to the chime sounding at unexpected times. Therefore, both Technician A and Technician B could be right in identifying potential causes for the issue.

65. Which of the following is the most likely cause ot the seat belt buzzer and seat belt light operating continually with the ignition switch on and the driver seat belt buckled?

• a. The timer contacts are stuck in the closed position.
• b. The circuit is shorted to ground at Terminal 3 on the buzzer.
• c. The timer contacts and the seat belt switch are stuck closed.
• d. The circuit is open at Terminal 2 on the buzzer relay.

Answer: a. The timer contacts are stuck in the closed position.

Description: In this scenario, the most likely cause of the problem is that the timer contacts are stuck in the closed position. This means that the timer, which is responsible for controlling the operation of the seat belt buzzer and light, is not functioning properly and remains closed even when the driver’s seat belt is buckled. This causes the buzzer and light to operate continually. To resolve the issue, the timer contacts should be checked and repaired or replaced if necessary.

66. While troubleshooting a tone generator system on a late-model vehicle, Technician A states that if the device does not work at all, the sounding device is bad or there is an open in the circuit. Technician B claims that the tone generator should be checked for operation by running it through the prescribed self-test mode. Which technician is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and B are correct. Technician A suggests that if the tone generator does not work at all, it could indicate a faulty sounding device or an open circuit. This means that the problem could be with the device itself or with the electrical connection. Technician B recommends checking the operation of the tone generator by running it through the prescribed self-test mode, which is a common procedure to verify the functionality of the device. By combining the approaches suggested by both technicians, one can effectively troubleshoot the tone generator system by examining the sounding device, checking for circuit continuity, and running the self-test mode. Therefore, option C is the correct answer.

67. The horn in a vehicle is sounding continuous. Technician A suggests that the wire from the relay winding to the horn switch might be grounded, while Technician B suggests that the relay points might be stuck in the open position. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B could be correct in this scenario. Technician A suggests that the wire from the relay winding to the horn switch might be grounded, which could create a continuous circuit and result in the horn continuously sounding. Technician B suggests that the relay points might be stuck in the open position, which would prevent the circuit from being completed and cause the horn to stay on. Both of these conditions can lead to the horn sounding continuously, so both technicians’ explanations are valid.

68. Which of the following is a potential cause of the problem with the horns not sounding EXCEPT?

• a. An open ground circuit on the left horn.
• b. An open circuit in the horn relay winding.
• c. An open circuit at the horn brush/slip ring.
• d. An open fuse link in the relay power wire.

Answer: d. An open fuse link in the relay power wire.

Description: The text states that the cause of the problem may be “all of the following EXCEPT” one option. Options A, B, and C are potential causes that could result in the horns not sounding. However, option D, an open fuse link in the relay power wire, is excluded as a potential cause. This means that a problem with the fuse link in the relay power wire is not responsible for the horns not sounding.

69. Which technician is correct about the possible cause for the windshield wipers operating at only low speed regardless of switch position?

• a. Technician A, who says the problem may be the switch.
• b. Technician B, who says the cause of the problem may be a worn high¬speed brush.
• c. Both Technician A and Technician B.
• d. Neither Technician A nor Technician B.

Answer: c. Both Technician A and Technician B.

Description: Both Technician A and Technician B could be correct about the possible cause for the windshield wipers operating at only low speed regardless of switch position. The problem could indeed be the switch, as suggested by Technician A, which might be faulty and not allowing the wipers to engage at higher speeds. On the other hand, Technician B’s suggestion of a worn high¬speed brush could also be a valid cause, as a worn brush could hinder the wipers from functioning at higher speeds. Therefore, it is possible that both factors could contribute to the issue.

70. The intermittent wiper function is not working, but the wipers move through the set speeds without a problem. Technician A says the resistance of the variable resistor in the intermittent wiper control module should be checked. Technician B says some intermittent wiper systems are incorporated into the body control module (BCM), and resistance reading should not be taken through the module. Rather, the BCM’s self-diagnostic routine should be used. Who is right?

• a. Technician A only.
• b. Technician B only.
• c. Both Technician A and Technician B.
• d. Neither Technician A nor Technician B.

Answer: c. Both Technician A and Technician B.

Description: Both Technician A and Technician B are correct in this scenario. Technician A suggests checking the resistance of the variable resistor in the intermittent wiper control module, which is a valid troubleshooting step. The resistance reading can help identify any issues with the variable resistor that might be causing the intermittent wiper function to malfunction. Technician B, on the other hand, points out that some intermittent wiper systems are integrated into the body control module (BCM). In such cases, it’s not recommended to take resistance readings through the module. Instead, the BCM’s self-diagnostic routine should be utilized to diagnose and troubleshoot the intermittent wiper system. I his ensures that the diagnostic process is carried out correctly and doesn’t interfere with the BCM’s functioning. Therefore, since both technicians provide relevant and accurate information, the correct answer is C. Both Technician A and Technician B.

71. While diagnosing slower-than-normal wiper operation, Technician A says the wiper linkage may be binding. Technician B says there may be excessive resistance in the control circuit. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Technician A is correct in stating that slower-than-normal wiper operation can be caused by a binding wiper linkage. The wiper linkage connects the wiper motor to the wiper arms, and if it becomes stuck or restricted in movement, it can result in slower wiper operation. Technician B is also correct in mentioning excessive resistance in the control circuit as a potential cause for slower wiper operation. The control circuit includes components like switches, relays, and wiring that enable the wiper system to function. If there is excessive resistance in this circuit, it can impede the flow of electrical current and lead to slower wiper operation. Therefore, both Technician A and Technician B are correct in their respective statements, and the correct answer is C. Both Technician A and Technician B.

72. Which of the following is the LEAST likely cause for an inoperative windshield washer system, if the windshield wipers work properly?

• a. Low fluid levels
• b. Defective switch
• c. Defective pump
• d. Blown fuse

Answer: d. Defective pump

Explanation: If the windshield wipers are working properly, it indicates that the fuse responsible for the wipers is intact and functioning correctly. Therefore, a blown fuse (option D) is the least likely cause for an inoperative windshield washer system when the wipers are working properly.

73. A customer complains about the intermittent operation of their windshield washers. The fluid level has been verified and is adequate. Technician A suggests that the issue could be a loose ground at the washer pump, while Technician B proposes that an open in the control circuit to the pump might be the cause. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B are correct in their assessments. The intermittent operation of the windshield washers can indeed be attributed to either a loose ground at the washer pump (as suggested by Technician A) or an open in the control circuit to the pump (as suggested by Technician B). A loose ground connection can result in inconsistent electrical contact, leading to intermittent functionality. Similarly, an open circuit in the control circuit can disrupt the flow of electricity, causing the washers to work sporadically. Therefore, both technicians’ explanations are valid in this scenario.

74. Which of the following is the most likely cause of the power window not working when using the window switch shown in the figure?

• a. An open circuit between the ignition switch and the window switch.
• b. An open circuit in the window switch movable contacts.
• c. An open circuit in the master switch ground wire.
• d. A short to ground at the circuit breaker in the motor.

Answer: b. An open circuit in the window switch movable contacts.

Description: The provided information states that the power window operates normally from the master switch but fails to work when using the window switch shown in the figure. Based on this, the most likely cause of the problem is an open circuit in the window switch’s movable contacts. An open circuit in the movable contacts prevents the flow of electrical current and disrupts the functioning of the window switch. It is important to check the integrity of the contacts and ensure they are properly connected to rectify the issue.

75. Technician A says the open circuit between the RR power window switch and the ground is causing the issue. Technician B says the up/down contacts in the RR power window switch may be open. Who is correct?

• a. Technician A
• b. Technician B
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B are correct. Technician A suggests that there may be an open circuit between the RR power window switch and the ground, which could prevent the window from operating. Technician B suggests that the up/down contacts in the RR power window switch may be open, indicating a possible issue with the switch itself. Both of these scenarios could lead to the RR power window not functioning. Therefore, both technicians’ statements are accurate and contribute to the diagnosis of the problem.

76. Which of the following is a possible cause of a power seat moving very slowly or not working at all EXCEPT?

• a. Poor ground connections.
• b. An open switch.
• c. Binding linkages.
• d. A faulty motor.

Answer: b. An open switch.

Description: An open switch is not a possible cause of a power seat moving very slowly or not working at all. An open switch refers to a switch that is not making proper electrical contact when activated, which would prevent the power from reaching the motor. However, in this case, the question specifically asks for an exception. Poor ground connections, binding linkages, and a faulty motor are all potential causes of a power seat malfunction. Poor ground connections can interrupt the flow of electricity, causing the seat to operate slowly or not at all. Binding linkages occur when the mechanical components that allow the seat to move become stuck or restricted, hindering its movement. A faulty motor refers to a malfunctioning motor that tails to generate the necessary power to move the seat properly.

77. Which of the following is a possible cause of the problem with the six-way power seat described in the text EXCEPT?

• a. A newspaper jammed in the seat track mechanism.
• b. An open circuit between the switch and the horizontal motor.
• c. An open circuit in the circuit from the switch assembly to ground.
• d. Burned contacts in the horizontal seat switch.

Answer: a. A newspaper jammed in the seat track mechanism.

Description: The text states that there is no horizontal seat movement in the figure. However, a newspaper jammed in the seat track mechanism would affect the vertical movement, not the horizontal movement. Therefore, it is the only option that is NOT a possible cause of the problem described.

78. Which of the following statements about rear defoggers is true EXCEPT?

• a. Many rear defoggers are controlled by a timer.
• b. When the defogger is on, 9.5 volts are supplied to the grid.
• c. Each track in the grid is parallel to the other tracks.
• d. In many defogger circuits, the timer energizes the defogger relay.

Answer: b.

Description: The statement that is NOT true is option B. The correct voltage supplied to the grid when the defogger is on may vaiy depending on the specific system, but it is not necessarily 9.5 volts. The other statements, A, C, and D are all true. Rear defoggers can be controlled by a timer, the tracks in the grid are parallel to each other, and in many defogger circuits, the timer energizes the defogger relay.

79. Which of the following statements is true when diagnosing and testing a rear defogger circuit?

• a. The voltage drop from the ground side of the grid to an engine ground should not exceed one volt.
• b. A 12 V test light should be illuminated at half brilliance at any place on a grid track.
• c. If a 12V test light is not illuminated on part of a grid track, the track is open.
• d. A 12V test light should become brighter as it is moved to the ground side of the track.

Answer: a. The voltage drop from the ground side of the grid to an engine ground should not exceed one volt.

Description: When diagnosing and testing a rear defogger circuit, it is important to ensure that the voltage drop from the ground side ot the grid to an engine ground does not exceed one volt. This helps to identify any potential issues with the circuit’s grounding. Options B, C, and D are incorrect as they do not accurately describe the expected behavior or indicators of a properly functioning rear defogger circuit.

80. The RR door power lock is inoperative, but all the other power door locks operate normally. Technician A says the door lock relay winding might have an open circuit. Technician B says the door unlock relay contacts might have an open circuit. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. oth Technician A and Technician B

Explanation: Both Technician A and Technician B could be correct in this scenario. Technician A suggests that the door lock relay winding might have an open circuit, which could explain why the RR (right rear) door power lock is inoperative. Technician B suggests that the door unlock relay contacts might have an open circuit, which could also cause the same issue. Both possibilities should be considered, and further diagnostic steps should be taken to determine the exact cause of the inoperative RR door power lock. Therefore, both technicians could be right in their assessments.

81. Which of the following could be the cause of the door locks not functioning in lock mode when the lock button is depressed, with 12V supplied to the lock relay?

• a. An open ground connection at the unlock relay contacts.
• b. An open circuit in the LF door lock motor armature.
• c. An open circuit between the master switch and the lock relay winding.
• d. A failed fuse connected to the door lock switches.

Answer: c. An open circuit between the master switch and the lock relay winding.

Description: The cause of the problem in this scenario could be an open circuit between the master switch and the lock relay winding. This means that there is a break in the electrical connection between the master switch (which controls the door locks) and the lock relay winding, preventing the proper functioning of the door locks in lock mode.

82. Which statement is correct regarding remote keyless entry systems?

• a. Most remote controls are a remote transmitter.
• b. Most remote controls contain a replaceable battery.
• c. Both A and B are correct.
• d. Neither A nor B is correct.

Answer: c. Both A and B are correct.

Description: Both Technician A and Technician B are correct. Remote keyless entry systems typically consist of a remote control, which acts as a transmitter, allowing the user to lock and unlock the vehicle remotely. Therefore, Technician A is correct. Additionally, most remote controls use replaceable batteries for power, making Technician B’s statement also correct.

83. Which of the following statements about remote keyless entry systems is true EXCEPT?

• a. When the unlock button on the remote control is pressed, the interior lights are illuminated on many systems.
• b. The interior lights, turned on by the remote keyless entry system, automatically turn off after approximately one minute.
• c. The interior lights, turned on by the remote keyless entry system, go off when the ignition switch is turned on.
• d. The remote control unlocks the doors when the remote transmitter is loo yards (91 meters) from the vehicle.

Answer: d. The remote control unlocks the doors when the remote transmitter is 100 yards (91 meters) from the vehicle.

Description: The statement that is NOT true is option D. Remote keyless entry systems do not typically unlock the doors when the remote transmitter is 100 yards (91 meters) from the vehicle. The distance at which the remote control can unlock the doors varies depending on the specific system, but it is generally within a shorter range than 100 yards.

84. Which of the following is a possible cause for the complete inoperability of the power sunroof, as depicted in the figure?

• a. An open circuit in the power saver relay winding.
• b. An open circuit in the close relay winding.
• c. An open circuit at the right-hand contact in the close switch.
• d. An open circuit between the close relay winding and close switch.

Answer: c. An open circuit at the right-hand contact in the close switch.

Description: In this scenario, an open circuit at the right-hand contact in the close switch could be the cause of the power sunroofs complete inoperability. This means that there is a break in the electrical connection at the right-hand contact, preventing the flow of current required for the close switch to function properly.

85. Which technician’s statement correctly identifies the potential location of the short circuit in the power sunroof circuit?

• a. Technician A: The wire between fuse 17 and the power saver relay winding might be shorted to the ground.
• b. Technician B: The wire might be shorted to the ground between the power saver relay winding and the ground connection.
• c. Both Technician A and Technician B are correct.
• d. Neither Technician A nor Technician B is correct.

Answer: c. Both Technician A and Technician B are correct.

Description: In the given scenario, Technician A suggests that the wire between fuse 17 and the power saver relay winding might be shorted to the ground. Technician B, on the other hand, proposes that the wire might be shorted to the ground between the power saver relay winding and the ground connection. Both statements are plausible and complementary, as they address different sections of the circuit. Therefore, both Technician A and Technician B are correct in their assessments of the potential location of the short circuit

86. Which statement accurately describes the power mirrors when diagnosing and servicing, as shown in the figure?

• a. Each mirror contains a combination up/down and left/right motor.
• b. Each mirror contains a separate up/down and left/right motor.
• c. The mirror motors are grounded at the mirror assemblies.
• d. When one of the switches is pressed, 9.SV are supplied to a mirror motor.

Answer: b. Each mirror contains a separate up/down and left/right motor.

Description: When diagnosing and servicing power mirrors, each mirror contains a separate up/down and left/right motor. This means that the mirror assemblies have distinct motors for vertical (up/down) movement and horizontal (left/right) movement, allowing independent control over both directions.

87. Technician A says that some electrically heated mirror elements are operated by the rear defogger timer. Technician B says that after it is energized, the electrically heated mirror timer remains closed until the operator turns it off. Who is correct?

• a. Technician A only
• b. Technician B only
• c. Both Technician A and B
• d. Neither Technician A nor B

Answer: c. Both Technician A and B

Description: Both Technician A and Technician B are correct. Some electrically heated mirror circuits are indeed operated by the rear defogger timer. 1 his means that when the rear defogger timer is activated, it also powers the electrically heated mirror elements. Additionally, after the electrically heated mirror timei is energized, it remains closed until the operator manually turns it off. This allows the mirrors to continue heating until the operator decides to deactivate the function. Therefore, both technicians are providing accurate statements.

88. While discussing a radio static problem, Technician A says there may be a poor metal-to-metal connection between the hood and other body components. Technician B says the suppression coil may be defective on the instrument voltage limiter. Who is correct?

• a. Technician A
• b. Technician B
• c. Both Technician A and Technician B
• d. Neither Technician A nor Technician B

Answer: c. Both Technician A and Technician B

Description: Both Technician A and Technician B are correct in their statements. A poor metal-to-metal connection between the hood and other body components can cause radio static issues. Additionally, a defective suppression coil on the instrument voltage limiter can also contribute to radio static problems. Therefore, both potential causes mentioned by I echnician A and Technician B should be considered when troubleshooting the radio static issue.

89. Which of the following statements about radio antenna diagnosis with an ohm¬meter is true EXCEPT?

• a. Continuity should be present between the end of the antenna mast and the center pin on the lead-in wire.
• b. Continuity should be present between the ground shell of the lead-in wire and the antenna mounting hardware.
• c. No continuity should be present between the center pin on the lead-in wire and the ground shell.
• d. Continuity should be present between the end of the antenna mast and the antenna mounting hardware.

Answer: c. No continuity should be present between the center pin on the lead-in wire and the ground shell.

Description: When using an ohm- meter to diagnose a radio antenna, all of the given statements are generally true except for statement C. Normally, there should be continuity (a low resistance) between the center pin on the lead-in wire and the ground shell. This connection allows for the proper functioning of the antenna system. Therefore, the lack of continuity between the center pin and the ground shell indicates a potential issue with the antenna.

90. Refer the above figure. Which component might be causing the power antenna to stay up even when the car is turned off?

• a. Radio fuse.
• b. Antenna fuse.
• c. Down limit switch.
• d. Antenna motor.

Answer: c. Down limit switch.

Description: The down limit switch is responsible for controlling the movement of the power antenna. If there is an open circuit in the down limit switch, it can prevent the antenna from retracting when the car is turned off.

91. Which technician is correct when diagnosing a nonfunctional cruise control system?

• a. Technician A, who begins the diagnosis with a check of the brake light switch.
• b. Technician B, who checks the mechanical parts of the cruise control system before moving on to the electrical circuit.
• c. Both Technician A and Technician B.
• d. Neither Technician A nor Technician B.

Answer: c. Both Technician A and Technician B.

Description: Both Technician A and Technician B are correct in their approach to diagnosing a nonfunctional cruise control system. Technician A starts by checking the brake light switch because the brake light switch is often tied to the cruise control system and can affect its functionality. Technician B, on the other hand, checks the mechanical parts of the cruise control system before moving on to the electrical circuit, which is a logical step to ensure that the mechanical components are working properly before investigating the electrical components. Therefore, both technicians’ approaches are valid and complementary in diagnosing the issue with the cruise control system.

92. Which of the following defects is likely to cause the whining noise in the radio that increases with engine speed and stops when the alternator field wire is disconnected EXCEPT?

• a. a defective stator.
• b. a defective diode.
• c. a defective capacitor.
• d. an open field winding.

Answer: a. a defective stator.

Description: The whining noise in the radio that increases with engine speed and stops when the alternator field wire is disconnected is likely caused by electrical interference from the alternator. When the field wire is disconnected, the alternator is no longer producing electrical power and the noise ceases. The other options, B (defective diode), C (defective capacitor), and D (open field winding), are all potential causes of electrical issues that can result in the whining noise. However, a defective stator is not directly related to the alternator’s electrical output and is therefore less likely to be the cause of the problem.

93. Which of the following could be the cause of the repeated fuse replacements in the cigar lighter?

• a. High resistance in the lighter element.
• b. A high resistance connector on the cigar lighter.
• c. A shorted lighter element.
• d. A grounded wire between the lighter and the chassis.

Answer: c. A shorted lighter element.

Description: The repeated fuse replacements in the cigar lighter could be caused by a shorted lighter element. A short circuit in the lighter element creates a direct path for the electrical current, causing an excessive flow of current and subsequently blowing the fuse.

94. Which of the following defects is a possible cause of the inoperative clock in the figure EXCEPT?

• a. A grounded circuit on the SB wire at Connector 5IM.
• b. An open circuit at body ground B.
• c. An open circuit terminal Bin the clock connector.
• d. A grounded circuit on wire B/R at the clock connector.

Answer: b. An open circuit at body ground B.

Description: The inoperative clock in the figure can have various causes that result in its malfunction. However, an open circuit at body ground B is not among the potential causes. Grounding issues or open circuits at the clock connector or the SB wire (A and C) and a grounded circuit on wire B/R at the clock connector (D) can all disrupt the clock’s functionality.

95. Which component might cause erratic cruise control operation in a vehicle with electronic cruise control and a stepper motor?

• a. Coolant temperature sensor
• b. Cable adjustment from the stepper motor to the throttle
• c. Defective mass airflow sensor
• d. Kinked speedometer cable

Answer: a.Coolant temperature sensor

Description: In a vehicle with electronic cruise control and a stepper motor, a defective coolant temperature sensor can cause erratic cruise control operation. The coolant temperature sensor provides information about the engine’s temperature to the cruise control system. If the sensor is faulty, it may send incorrect signals to the cruise control module, resulting in unstable or inconsistent cruise control operation.

96. In the given scenario, what should the technicians do to disarm the anti-theft system of the vehicle?

• a. Technician A should try the key in the driver’s door.
• b. Technician B should check the wiring diagram of the system.
• c. Both Technician A and B should work together to disarm the system.
• d. Neither Technician A nor B can disarm the system.

Answer: a. Technician A should try the key in the driver’s door.

Description: According to the text, Technician A tries the key in the driver’s door to disarm the anti-theft system of the vehicle. Therefore, Technician A is the correct one in this situation. Technician B’s action of checking the wiring diagram is not relevant to disarming the system, so option B is incorrect. Option C is incorrect because only Technician A’s action is necessary. Option D is incorrect because Technician A’s action can disarm the system.

97. Which technician’s advice is correct for diagnosing the issue with the alarm system?

• a. Technician A suggests checking the driver door ajar switch for corrosion.
• b. Technician B suggests checking that the interior lights are on when the driver door is open.
• c. Both Technician A and B are correct.
• d. Neither Technician A nor B is correct.

Answer: c. Both Technician A and B are correct.

Description: The text states that the alarm system does not activate when the driver door is opened. In this scenario, both Technician A and Technician B provide valid suggestions for diagnosing the issue. Technician A’s advice to check the driver door ajar switch for corrosion is important because if the switch is corroded, it may not properly detect when the door is open. Technician B’s advice to verify that the interior lights are on when the driver door is open is also relevant because it indicates whether there is a problem with the door sensor or the circuit that controls the interior lights. Therefore, both Technician A and B are correct in their recommendations for troubleshooting the problem.

98. Which component is found on modern-day factory installed anti-theft systems EXCEPT?

• a. Control module.
• b. Siren.
• c. Starter interrupt relay.
• d. Trunk ajar switch.

Answer: d. Trunk ajar switch.

Description: Modern-day factory installed anti-theft systems typically include a control module, siren, and starter interrupt relay to enhance security and prevent unauthorized access to the vehicle. However, the trunk ajar switch is not commonly included as a standard component in these systems.

99. An air bag warning light is illuminated intermittently with the engine running. Which statement correctly identifies the possible cause and consequence of this issue?- a. Technician A: The air bag system has an electrical defect.

• b. Technician B: This defect may cause the air bag to inflate accidentally.
• c. Both Technician A and B are correct.
• d. Neither Technician A nor B is correct.

Answer. c. Both lechnician A and B are correct.

Description: When the air bag warning light illuminates intermittently with the engine running, it indicates a potential issue with the air bag system. Technician A is correct in stating that the air bag system has an electrical defect, as this could be the underlying cause of the warning light being illuminated. Technician B is also correct in suggesting that this defect may cause the air bag to inflate accidentally. Therefore, both Technician A and B are correct in their statements.

100. All the following statements about air bag system service is true EXCEPT?

• a. The negative battery cable should be disconnected and manufacturer’s recommended waiting period completed.
• b. Safety glasses and gloves should be worn when handling deployed air bags.
• c. A 12V powered test light may be used to test continuity between the inflator module and the sensors.
• d. Sensor operation may be affected if the sensor brackets are bent or twisted.

Answer: c.A 12V powered test light may be used to test continuity between the inflator module and the sensors.

Description: The false statement is option C. A12V powered test light should not be used to test continuity between the inflator module and the sensors. The air bag system contains sensitive components, and using a test light may cause damage to the system or lead to unintentional air bag deployment. Proper diagnostic tools and procedures should be followed to ensure the safe and accurate testing of the air bag system.

101. The purpose of a load tester is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Test the ability of a battery to deliver power under load
• d. None of the above

Answer: c

Description: A load tester is used to test the ability of a battery to deliver power under load conditions and can be used to diagnose battery problems or determine the state of charge of a battery.

102. The purpose of a battery charger is to:

• a. Regulate the voltage of a circuit
• b. Amplify electrical signals
• c. Recharge a discharged battery
• d. None of the above

Answer: c

Description: A battery charger is used to recharge a discharged battery and maintain its state of charge and can be used to ensure that the battery is ready for use when needed.

103. The purpose of a multimeter is to:

• a. Test the voltage, current, and resistance of a circuit
• b. Test the continuity of a circuit
• c. Measure the frequency of an electrical signal
• d. None of the above

Answer: a

Description: A multimeter is used to test the voltage, current, and resistance of a circuit, and can be used to diagnose a wide range of electrical problems in a vehicle.

104. The purpose of a thermal imaging camera is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Detect and visualize changes in temperature
• d. None of the above

Answer: c

Description: A thermal imaging camera is used to detect and visualize changes in temperature and can be used to diagnose problems with electrical components that generate heat or have a thermal signature.

105.    The purpose of a pressure gauge is to:
     

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the pressure of a fluid or gas
• d. None of the above

Answer: c

Description: A pressure gauge is used to measure the pressure of a fluid or gas and can be used to diagnose problems with hydraulic or pneumatic systems in a vehicle.

106. The purpose of a vacuum gauge is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the vacuum pressure in a system
• d. None of the above

Answer: c

Description: A vacuum gauge is used to measure the vacuum pressure in a system and can be used to diagnose problems with vacuum-operated components or systems.

107. The purpose of a fuel pressure gauge is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the fuel pressure in a system
• d. None of the above

Answer: c

Description: A fuel pressure gauge is used to measure the fuel pressure in a system and can be used to diagnose problems with fuel delivery or pressure regulation.

108. The purpose of an exhaust gas analyzer is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Analyze the composition of exhaust gases
• d. None of the above

Answer: c

Description: An exhaust gas analyzer is used to analyze the composition of exhaust gases and measure the levels of various pollutants, which can be used to diagnose problems with the engine or emissions system.

109. The purpose of an air/fuel ratio meter is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the air/fuel ratio in a system
• d. None of the above

Answer: c

Description: An air/fuel ratio meter is used to measure the air/fuel ratio in a system and can be used to diagnose problems with the fuel delivery or combustion process.

110. The purpose of a smoke machine is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Generate smoke to locate leaks in a system
• d. None of the above

Answer: c

Description: A smoke machine is used to generate smoke and locate leaks in a system, such as in an emissions system or vacuum-operated component.

111. The purpose of a refrigerant identifier is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Identify the type and purity of refrigerant in a system
• d. None of the above

Answer: c

Description: A refrigerant identifier is used to identify the type and purity of refrigerant in a system and can be used to ensure that the correct refrigerant is being used and that it is not contaminated.

112. The purpose of a leak detector is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Detect and locate leaks in a system
• d. None of the above

Answer: c

Description: A leak detector is used to detect and locate leaks in a system, such as in an air conditioning or fuel system, and can be used to diagnose problems with the system or components.

113. The purpose of a power probe is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Provide power and ground to a circuit for testing and diagnosis
• d. None of the above

Answer: c

Description: A power probe is used to provide power and ground to a circuit for testing and diagnosis and can be used to activate components or test for proper operation.

114. The purpose of a fuel injection tester is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Test the operation and fuel delivery of fuel injectors
• d. None of the above

Answer: c

Description: A fuel injection tester is used to test the operation and fuel delivery of fuel injectors and can be used to diagnose problems with fuel delivery or injector operation.

115.    The purpose of a digital storage oscilloscope is to:
     

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure and display electrical signals over time, and store the waveform for analysis
• d. None of the above

Answer: c

Description: A digital storage oscilloscope is used to measure and display electrical signals over time and store the waveform for analysis and further diagnosis.

116. The purpose of a non-contact thermometer is to.

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the temperature of a component or system without contact
• d. None of the above

Answer: c

Description: A non-contact thermometer is used to measure the temperature ot a component or system without contact and can be used to diagnose problems with overheating or temperature-related issues.

117. The purpose of an amp clamp is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure the current flowing through a wire or cable
• d. None of the above

Answer: c

Description: An amp clamp is used to measure the current flowing through a wire or cable and can be used to diagnose problems with electrical systems or components.

118. The purpose of an endoscope is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Visualize and inspect hard-to-reach areas or components
• d. None of the above

Answer: c

Description: An endoscope is used to visualize and inspect hard-to-reach areas 01 components and can be used to diagnose problems with components or systems that are difficult to access.

119. The purpose of a wire tracer is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Trace the path of a wire or cable through a system
• d. None of the above

Answer: c

Description: A wire tracer is used to trace the path of a wire or cable through a system and can be used to diagnose problems with wiring or locate specific wires or connections.

120. The purpose of a breaker bar is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Apply torque to a fastener or bolt
• d. None of the above

Answer: c

Description: A breaker bar is used to apply torque to a fastener or bolt and can be used to remove stubborn or difficult-to-remove bolts or nuts.

121. The purpose of a torque wrench is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Apply a specific amount of torque to a fastener or bolt
• d. None of the above

Answer: c

Description: A torque wrench is used to apply a specific amount of torque to a fastener or bolt and can be used to ensure that fasteners are tightened to the correct specifications.

122. The purpose of a bearing puller is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Remove bearings from shafts or housings
• d. None of the above

Answer: c

Description: A bearing puller is used to remove bearings from shafts or housings and can be used to replace worn or damaged bearings in various components or systems.

123. The purpose of a valve spring compressor is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Compress valve springs for removal or installation
• d. None of the above

Answer: c

Description: A valve spring compressor is used to compress valve springs for removal or installation and can be used to replace worn or damaged valve components or perform engine repairs.

124. The purpose of a feeler gauge is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Measure small gaps or clearances in components or systems
• d. None of the above

Answer: c

Description: A feeler gauge is used to measure small gaps or clearances in components or systems and can be used to ensure proper fit or clearance in various applications.

125. The purpose of a wire crimping tool is to:

• a. Test the voltage of a circuit
• b. Test the continuity of a circuit
• c. Crimp electrical connectors onto wires or cables
• d. None of the above

Answer: c

Description: A wire crimping tool is used to crimp electrical connectors onto wires or cables and can be used to make secure electrical connections or repairs.

Electrical and Electronic Systems Diagnosis - Quizz

1. What tool is used to check continuity in an electrical circuit?

• a. Ammeter
• b. Ohmmeter
• c. Test light
• d. Voltmeter

Answer: c. Test light

Description: A test light is used to check continuity in an electrical circuit by connecting the lead to the ground and probing various terminals in the circuit. The test light illuminates when there is continuity and does not when there is an open circuit.

2. How can a technician measure the voltage drop across a component in a circuit?

• a. With an ammeter in series
• b. With a test light
• c. With an ohmmeter
• d. With a voltmeter across the component

Answer: d. With a voltmeter across the component

Description: A voltmeter is connected across a component in a circuit to measure the voltage drop. The current must be flowing through the circuit during the voltage drop test.

3. Which instrument is used to measure current flow in electrical/electronic circuits?

• a. Ammeter
• b. Voltmeter
• c. Ohmmeter
• d. Oscilloscope

Answer: a. Ammeter

Description: An ammeter is used to measure current flow in electrical/electronic circuits. It has a low internal resistance and must be connected in series with the circuit.

4. Which of the following is NOT a suitable method for checking continuity and resistances in electrical/electronic circuits?

• a. Ammeter
• b. Ohmmeter
• c. Oscilloscope
• d. Test light

Answer: a. Ammeter

Description: An ammeter is used for measuring current flow in a circuit, not for checking continuity and resistances. An ohmmeter is used for checking continuity and resistances in electrical/electronic circuits.

5. What does a flat trace on an oscilloscope indicate?

• a. High voltage
• b. Low voltage
• c. Constant voltage
• d. Voltage spike

Answer: c. Constant voltage

Description: A flat trace on an oscilloscope indicates that the voltage is staying constant at that level.

6. What is the purpose of a scan tool in diagnosing electronic systems?

• a. To measure voltage
• b. To communicate with the vehicle’s computer
• c. To check continuity
• d. To display waveforms

Answer: b. To communicate with the vehicle’s computer

Description: A scan tool is designed to communicate with the vehicle s computer. It accesses trouble codes, runs tests, and monitors system activity.

7. What is the purpose of using a fused jumper wire when diagnosing electrical circuits?

• a. To measure voltage
• b. To bypass a part of a circuit to locate a defect
• c. To check for shorts and opens
• d. To measure resistance

Answer: b.To bypass a part of a circuit to locate a defect

Description: A fused jumper wire is used to bypass a part of a circuit to locate a defect. When the bypassed component is causing the issue, the circuit operation is restored to normal.

8. Which of the following is the correct method for diagnosing a short to the ground in a circuit?

• a. Using an ohmmeter
• b. Connecting a 12V test light in place of the circuit fuse
• c. Measuring voltage drop with a voltmeter.
• d. Measuring current flow with an ammeter

Answer: b. Connecting a 12V test light in place of the circuit fuse

Description: To diagnose a short to the ground, connect a 12V test light in place of the circuit fuse. With the circuit switch on, disconnect connectors beginning at the load. The test light remaining on indicates a short to the ground between the test light and the disconnected connector. If the test light goes out, the short to the ground is between the disconnected connector and the load.

9. What is the recommended method for measuring abnormal key-off battery drain (parasitic draw)?

• a. Using a test light
• b. Using a voltmeter
• c. Using a tester switch connected in series at the negative battery terminal.
• d. Using an ammeter in parallel with the circuit

Answer: c. Using a tester switch connected in series at the negative battery terminal

Description: Measuring abnormal key-off battery drain (parasitic draw) is often done with a tester switch connected in series at the negative battery terminal. A multimeter with a milliampere scale is connected in parallel to the tester switch to measure the current drain.

10. Which of the following should be used to inspect, test, and replace fusible links, circuit breakers, fuses, and other current limiting devices?

• a. Ammeter
• b. Test light
• c. Ohmmeter
• d. Voltmeter

Answer: c. Ohmmeter

Description: An ohmmeter is used to inspect, test, and replace fusible links, circuit breakers, fuses, and other current limiting devices. A properly functioning component should read zero ohms, while an open circuit breaker, fuse, or fuse link will cause an infinite ohmmeter reading

Battery Diagnosis and Service - Quizz

1. When performing a battery state of charge test with a hydrometer, how many specific gravity points should be subtracted from the hydrometer reading for every io°F (5-6°C) of electrolyte temperature below 8o°F (26.7°C)?

• a. 0.001
• b. 0.002
• c. 0.003
• d. 0.004

Answer: d. 0.004

Description: For every io°F (5.6°C) of electrolyte temperature below 8o°F (26.7°C), 0.004 specific gravity points should be subtracted from the hydrometer reading during a battery state of charge test.

2. What is the battery discharge rate for a capacity test?

• a. One-quarter of the cold cranking rating
• b. One-third of the cold cranking rating
• c. One-half of the cold cranking rating
• d. Two-thirds of the cold cranking rating

Answer: c. One-half of the cold cranking rating

Description: The battery discharge rate for a capacity test is usually one-half of the cold cranking rating.

3. Which of the following is NOT a result of disconnecting the battery from a vehicle’s computer?

• a. Loss of radio presets
• b. Erratic engine operation
• c. Erratic transmission shifting
• d. Increased fuel efficiency

Answer: d. Increased fuel efficiency

Description: Disconnecting the battery from a vehicle’s computer can cause the loss of radio presets, erratic engine operation, and erratic transmission shifting, but it does not affect fuel efficiency.

4. What should you do if the electrolyte level is low in a maintenance-free battery with a built-in hydrometer?

• a. Add distilled water
• b. Add electrolyte
• c. Replace the battery
• d. Charge the battery

Answer: c.Replace the battery

Description: In maintenance-free batteries with built-in hydrometers, a low electrolyte level indicates that the battery should be replaced.

5. When disconnecting battery cables, which cable should be disconnected first?

• a. Positive cable
• b. Negative cable
• c. Both at the same time
• d. It doesn’t matter

Answer: b. Negative cable

Description: When disconnecting battery cables, always disconnect the negative cable first to prevent electrical shorts or damage to the vehicle’s electrical system.

6. Which of the following is NOT a suitable method for cleaning battery terminal contact surfaces?

• a. Wire brush
• b. Sandpaper
• c. Baking soda and water solution
• d. Grease

Answer: d. Grease

Description: Grease is not a suitable method for cleaning battery terminal contact surfaces. Suitable methods include using a wire brush, sandpaper, or a baking soda and water solution.

7. When jump-starting a vehicle, where should the negative boostei cable be connected in the vehicle being boosted?

• a. Positive terminal of the dead battery
• b. Negative terminal of the dead battery
• c. Unpainted metal part of the engine block or chassis
• d. Positive terminal of the booster battery

Answer: c. Unpainted metal part of the engine block or chassis

Description: When jump-starting a vehicle, the negative booster cable should be connected to an unpainted metal part of the engine block or chassis in the vehicle being boosted, away from the battery itself.

8. When charging a battery, what should you do if the temperature exceeds 125°F (51.7°C)?

• a. Continue charging
• b. Increase the charging rate
• c. Decrease the charging rate
• d. Stop charging and let the battery cool

Answer: d. Stop charging and let the battery cool

Description: If the battery temperature exceeds 125°F (51.7°C) while charging, stop charging immediately and allow the battery to cool before resuming the charging process to prevent damage.

9. What is the purpose of protective pads that go under the clamp and around the battery terminal?

• a. To improve electrical conductivity
• b. To inhibit corrosion
• c. To provide additional support
• d. To help with cable routing

Answer: b.To inhibit corrosion

Description: Protective pads that go under the clamp and around the battery terminal are designed to inhibit corrosion, which can cause poor electrical connections and reduced battery performance.

10. When jump-starting a vehicle, which booster cable should be connected first?

• a. Positive cable in the booster vehicle
• b. Negative cable in the booster vehicle
• c. Positive cable in the dead vehicle
• d. Negative cable in the dead vehicle

Answer: a. Positive cable in the booster vehicle

Description: When jump-starting a vehicle, always connect the positive booster cable first, followed by the negative booster cable. This sequence helps pievent electrical shorts or damage to the vehicles involved.

Starting System Diagnosis and Repair - Quizz

1. What is a typical indication of a defective starter or internal engine problem in a vehicle?

• a. High starter current draw, high cranking speed, high cranking voltage
• b. High starter current draw, low cranking speed, low cranking voltage
• c. Low starter current draw, high cranking speed, low cranking voltage
• d. Low starter current draw, low cranking speed, high cranking voltage

Answer: b

Description: High starter current draw, low cranking speed, and low cranking voltage typically indicate a defective starter or internal engine problems, such as partially seized bearings.

2. Which test is used to identify excessive resistance in the starter circuit?

• a. Starter current draw test
• b. Starter circuit voltage drop test
• c. Starter control circuit test
• d. Starter relay and solenoid test

Answer: b

Description: The starter circuit voltage drop test is used to identify excessive resistance in the starter circuit by measuring the voltage drop across each component in the circuit while the starting motor is operating.

3. What should an ohmmeter reading be when connected across open relay or switch contacts?

• a. Zero
• b. Infinite
• c. Low but not zero
• d. Slightly above zero

Answer: b

Description: When an ohmmeter is connected across open relay or switch contacts, it should provide an infinite reading, indicating that the contacts are not connected.

4. To test the pull-in winding of a solenoid, where should the ohmmeter leads be connected?

• a. Across the solenoid terminal and the field coil terminal
• b. From the solenoid terminal to the ground
• c. Across the solenoid terminal and the battery terminal
• d. Across the solenoid terminal and the starter motor terminal

Answer: a

Description: To test the pull-in winding of a solenoid, connect the ohmmeter leads across the solenoid terminal and the field coil terminal. The ohmmeter should indicate the specified resistance.

5. What is the purpose of the starter current draw test?

• a. To measure the voltage drop across the starter circuit components
• b. To identify excessive resistance in the starter circuit
• c. To determine the condition of the starter and identify any internal engine problems
• d. To test the functionality of the starter control circuit components

Answer: c

Description: The purpose of the starter current draw test is to determine the condition of the starter and identify any internal engine problems by measuring the starter current draw, cranking speed, and cranking voltage.

6. During a starter circuit voltage drop test, where should the voltmeter leads be connected?

• a. Positive batteiy terminal and positive cable on the starter solenoid
• b. Negative battery terminal and negative cable on the starter solenoid
• c. Across the starter relay contacts
• d. Across the starter solenoid contacts

Answer: a

Description: During a starter circuit voltage drop test, connect the voltmetei leads to the positive battery terminal and the positive cable on the starter solenoid to measure the voltage drop across the positive battery cable.

7. What is a common cause of many starting problems in vehicles?

• a. Worn out starter motor
• b. Faulty ignition switch
• c. Battery problems
• d. Damaged solenoid

Answer: c

Description: Many starting problems can be attributed to battery problems. Performing a complete series of battery tests can help confirm the condition of the battery and identify any issues.

8. What should the clearance be between the pinion gear and the flywheel ring gear during starter installation?

• a. o.ooi to o.oio in (0.03 to 0.25 mm)
• b. 0.010too.
• c. 040 in (0.25 to 1.01 mm)
• d. 0.050 to 0.100 in (1.27 to 2.54 mm)
• e. 0.100 to 0.200 in (2.54 to 5.08 mm)

Answer: b

Description: During starter installation, the clearance between the pinion gear and the flywheel ring gear should typically be between 0.010 to 0.040 in (0.25 to 1.01 mm).

9. What should be the first step when diagnosing a starting problem in a vehicle?

• a. Inspect the starter motor
• b. Check the ignition switch
• c. Check the battery condition
• d. Inspect the starter solenoid

Answer: c

Description: The first step when diagnosing a starting problem should be to check the battery condition, as many starting problems can be attributed to battery issues.

10. When the engine fails to turn over after a visual inspection of the staitei system, what is the next step to diagnose the issue?

• a. Check the starter solenoid
• b. Inspect the ignition switch
• c. Try to turn the engine over manually using a laige socket wiench
• d. Test the battery cables for continuity

Answer: c

Description: When the engine fails to turn over after a visual inspection of the starter system, try to turn the engine over manually using a large socket wrench to turn the crankshaft pulley nut. If the engine cannot be rotated, it may be seized.

Charging System Diagnosis and Repair - Quizz

1. What is the primary cause of an undercharged battery.

• a. Loose alternator belt
• b. Defective voltage regulator
• c. Excessive resistance in the wire from the alternator battery terminal to the positive battery terminal
• d. Defective alternator

Answer: b. Defective voltage regulator

Description: A defective voltage regulator or alternator can result in a reduced charging rate, leading to an undercharged batteiy. Other possible causes include a loose alternator belt or excessive resistance in the wire from the alternator batteiy terminal to the positive batteiy terminal.

2. What tool can be used to test the tension of the alternator belt.

• a. Torque wrench
• b. Belt tension gauge
• c. Ohmmeter
• d. Multimeter

Answer: b. Belt tension gauge

Description: A belt tension gauge or measuring the belt deflection in the center of the belt span can be used to test the tension of the alternator belt.

3. What is the purpose of performing a charging system output test.

• a. To check the condition of the battery
• b. To measure the voltage regulator’s efficiency
• c. To determine the alternator’s output
• d. To inspect the condition of the alternator belt

Answer: c.To determine the alternator’s output

escription: The purpose of performing a charging system output test is to determine the alternator’s output and identify any needed repairs.

4. How can you test the generator (alternator) output?

• a. By using a commercially available charging system tester
• b. By measuring the resistance of the alternator belt
• c. By checking the voltage across the battery terminals
• d. By connecting an ammeter in series with the alternator

Answer: a. By using a commercially available charging system tester

Description: A commercially available charging system tester (e.g., VAT-40) can be used to determine the generator (alternator) output.

5. What is the primary cause of an overcharged battery?

• a. Loose alternator belt
• b. Defective voltage regulator
• c. Excessive resistance in the charging circuit
• d. Damaged alternator diodes

Answer: b. Defective voltage regulator

Description: A defective voltage regulator that allows high charging circuit voltage is the primary cause of an overcharged batteiy.

6. What is the primary cause of a no-charge condition?

• a. Open alternator field circuit
• b. Defective voltage regulator
• c. Loose alternator belt
• d. Damaged alternator diodes

Answer: a. Open alternator field circuit

Description: A no-charge condition may be caused by an open alternator field circuit or an open fuse link in the wire leading from the alternator batteiy terminal to the positive batteiy terminal.

7. What type of solder should be used when repairing electrical circuits by soldering?

• a. Acid core solder
• b. Rosin core solder
• c. Lead-free solder
• d. Silver solder

Answer: b.Rosin core solder

Description: Rosin core solder should always be used when repairing electrical circuits by soldering to ensure proper electrical connections and prevent corrosion.

8. What is the first step in removing a generator (alternator)?

• a. Disconnect the negative battery terminal
• b. Remove the alternator belt
• c. Disconnect the electrical connections
• d. Loosen the tensioner

Answer: a. Disconnect the negative battery terminal

Description: The first step in removing a generator (alternator) is to disconnect the negative battery terminal to ensure safety and prevent electrical shorts. To check the condition of the battery.

9. What is the purpose of performing a charging circuit voltage drop test?

• a. To determine the alternator’s output
• b. To identify excessive resistance in the charging circuit
• c. To measure the voltage regulator’s efficiency
• d. To check the condition of the battery

Answer: b.To identify excessive resistance in the charging circuit

Description: The purpose of performing a charging circuit voltage drop test is to identify excessive resistance in the charging circuit, which can cause an undercharged battery or other charging system issues.

10. What is the recommended method for insulating bare wires after soldering?

• a. Electrical tape
• b. Heat shrink tubing
• c. Liquid electrical tape
• d. Both a and b

Answer: d. Both a and b Description: After soldering, always insulate bare wires with heat shrink tubing or high-quality electrical tape properly applied to ensure a secure and lasting connection.

Lighting Systems Diagnosis and Repair - Quizz

1. What is the likely cause of dim headlights?

• a. A blown fuse
• b. A short circuit in the headlight wiring
• c. High resistance in the headlight circuit
• d. Excessive charge system voltage

Answer: c.

High resistance in the headlight circuit can cause dim headlights.

2. What is the purpose of a daytime running light (DRL) module?

• a. To increase the intensity of high beams
• b. To reduce battery voltage to approximately 6 volts
• c. To provide power to the headlight door motors
• d. To operate the dimmer switch

Answer: b.

The DRL module reduces battery voltage to approximately 6 volts to prolong the life of the bulbs.

3. What should you do before changing a halogen bulb?

• a. Turn on the lights
• b. Handle the bulb by the glass
• c. Coat the terminals of the bulb with grease
• d. Scratch or drop the bulb

Answer: c.

Coat the terminals of the bulb with grease to minimize corrosion.

4. What is the function of a headlight door module?

• a. 1 o provide power to the headlight door motors
• b. 10 operate the dimmer switch
• c. 10 reduce battery voltage to approximately 6 volts
• d. Io turn off the headlights when the circuit breaker opens

Answer: a.

The headlight door module provides power to the headlight door motors in response to signals received from the headlight circuit.

5. What is the likely cause of brighter than normal parking lights?

• a. A blown fuse
• b. Excessive voltage to the battery
• c. Loose or poor connections
• d. Corroded bulbs

Answer: b.

Excessive voltage to the battery can cause parking lights to be brighter than normal.

6. How can technicians verify a burned-out lightbulb?

• a. By inspecting the printed circuit for cracks
• b. By checking for loose connections
• c. By using an ohmmeter
• d. By testing the switch or relay

Answer: c.

Lightbulbs can be checked with an ohmmeter, and an infinite reading indicates an open (burned-out) bulb.

7. What is the function of a rheostat in the instrument cluster?

• a. To operate the dimmer switch
• b. To reduce battery voltage to approximately 6 volts
• c. To turn on the courtesy lights
• d. To provide power to the headlight door motors

Answer: a.

The rheostat operates the dimmer switch, which determines the brightness of the instrument cluster bulbs.

8. What is the likely cause of intermittent operation of courtesy lights?

• a. A short circuit in the control circuit
• b. A blown fuse
• c. Loose or poor connections
• d. Corroded bulbs

Answer: c.

ntermittent operation of courtesy lights is often caused by loose or poor connections.

9. What should technicians use to test switches, relays, bulbs, sockets, connectors, wires, and controllers of courtesy light circuits?

• a. A hammer
• b. A multimeter or other testing equipment
• c. A screwdriver
• d. A wrench

Answer: b.

Technicians should use a multimeter or other testing equipment to test these components.

10. Why is it essential to use parts that meet the vehicle manufacturer’s specifications when repairing or replacing components of courtesy light circuits?

• a. To ensure proper function and compatibility
• b. To increase the intensity of high beams
• c. To provide power to the headlight door motors
• d. To reduce battery voltage to approximately 6 volts

Answer: a.

Using parts that meet the vehicle manufacturer’s specifications is essential to ensure proper function and compatibility.

Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair - Quizz

1. What is the primary function of vehicle gauges?

• a. To monitor the weather conditions
• b. To provide entertainment to the driver
• c. To provide accurate information about the vehicle’s operating conditions
• d. To help the driver navigate through traffic.

Answer: c. To provide accurate information about the vehicle’s operating conditions

Description: Gauges are installed in a vehicle to monitor various parameters, such as fuel level, engine temperature, speedometer, and so on. The primary function of these gauges is to provide the driver with accurate information about the vehicle’s operating conditions.

2. What is the role of a voltage limiter in gauge readings?

• a. To increase the voltage output from the gauge
• b. To reduce the voltage output from the gauge
• c. To keep the voltage output from the gauge constant
• d. To limit the number of gauges installed in the vehicle.

Answer: c.To keep the voltage output from the gauge constant

Description: The voltage limiter supplies about 5V to the gauges, regardless of the charging system voltage. Its role is to keep the voltage output from the gauge constant, ensuring that the gauge readings are accurate.

3. What is the most likely cause of constant operation of a warning or indicator light?

• a. Loose wire or connector
• b. Burned-out bulb
• c. Short circuit in the controlling circuit
• d. Defective sensor or sending unit.

Answer: c. Short circuit in the controlling circuit

Description: If a warning or indicator light is constantly on, the most likely cause is a short circuit in the controlling circuit. This means that the circuit is bypassing the switch or sender and completing the circuit, causing the light to stay on.

4. What is the role of the Body Control Module (BCM) in operating warning lights?

• a. It sends input signals to the BCM for door ajar switches and low washer fluid switches.
• b. It monitors lamp status using a fiber-optic system.
• c. It grounds the appropriate circuit to activate the warning light.
• d. It opens the timer contacts after eight seconds to turn off the warning light.

Answer: c. It grounds the appropriate circuit to activate the warning light.

Description: The BCM grounds the appropriate circuit to activate the warning light. For example, when the door is ajar or the washer fluid is low, the BCM receives input signals from the switches and then grounds the appropriate circuit to activate the warning light.

5. What is the primary difference between analog and digital electronic gauges?

• a. Analog gauges show a constant change in value, while digital gauges operate in one of two states: on or off.
• b. Analog gauges are more reliable than digital gauges.
• c. Digital gauges show a constant change in value, while analog gauges operate in one of two states: on or off.
• d. Digital gauges are easier to repair than analog gauges.

Answer: a. Analog gauges show a constant change in value, while digital gauges operate in one of two states: on or off.

Description: Analog gauges show a continuous change in value, while digital gauges operate in one of two states: on or off. This means that digital gauges do not show continuous changes, but rather show changes in a step-wise manner.

6. What is the role of a timer in audible warning devices?

• a. To activate the buzzer when the key is left in the ignition switch or the headlights are on.
• b. To emit a tone to warn the driver that something in the system is not functioning properly.
• c. To ground the appropriate circuit to activate the warning sound.
• d. To open the timer contacts after eight seconds to turn off the warning sound.

Answer: d. To open the timer contacts after eight seconds to turn off the warning sound.

Description: A tinier is used in audible warning devices to turn off the warning sound after a set amount of time, usually around eight seconds. This prevents the warning sound from being continuous and ensures that the driver is aware of the issue without being overly distracted.

7. What is the primary function of self-diagnostic capabilities in electronic instrument displays?

• a. To monitor the weather conditions
• b. To ensure that all segments of the display are functioning properly.
• c. To provide entertainment to the driver
• d. To help the driver navigate through traffic.

Answer: b. To ensure that all segments of the display are functioning properly

Description: Self-diagnostic capabilities in electronic instrument displays are used to ensure that all segments of the display are functioning properly. During the initial illumination of all segments, any segments that are not illuminated indicate that there is an issue with the display and it should be replaced.

8. What is the primary function of a sending unit in a gauge circuit?

• a. To monitor the weather conditions
• b. To provide entertainment to the driver
• c. To change resistance in response to the change in fluid level or operating condition of the engine
• d. To help the driver navigate through traffic.

Answer: c. To change resistance in response to the change in fluid level or operating condition of the engine

Description: A sending unit is a variable resistor that changes resistance in response to the change in fluid level or operating condition of the engine. This change in resistance causes a change in voltage to the gauge and in current flow through the circuit, allowing the gauge to accurately display the information.

9. What is the most likely cause of an erratic gauge reading?

• a. Loose wire or connector
• b. Burned-out bulb
• c. Short circuit in the controlling circuit
• d. High operating voltages and defective sending units

Answer: d.High operating voltages and defective sending units

Description: An erratic gauge reading can be caused by various issues, but the most likely cause is high operating voltages and defective sending units. I his can cause the gauge to read incorrectly or not at all.

10. What is the role of a magnet in a temperature gauge?

• a. To attract the sending unit to the hot position
• b. To increase the resistance in the sending unit
• c. To attract the pointer to the cold position
• d. To decrease the resistance in the sending unit

Answer: c. To attract the pointer to the cold position

Description: A magnet is used in a temperature gauge to attract the pointer to the cold position. The sending unit is connected to the hot coil and the cold coil is grounded. When the coolant temperature is cold, the sending unit has a high resistance, causing current to flow through the lower resistance of the cold coil. The magnetism around the cold coil attracts the magnet and the pointer to the cold position. As the coolant temperature increases, the sending unit resistance decreases, causing current to flow through the lower resistance of the hot coil and sending unit, attracting the magnet and the pointer to the hot position.

Horn and Wiper/Washer Diagnosis and Repair - Quizz

1. Which of the following components of a wipei’ system is responsible for moving the wiper arms back and forth across the windshield?

• a. Wiper switch
• b. Wiper blade
• c. Wiper motor
• d. Wiper arm

Answer: c. Wiper motor

Description: The wiper motor is responsible for moving the wiper arms back and forth across the windshield.

2. In most intermittent wiper controls, what provides a voltage input to the intermittent wiper module?

• a. Relay
• b. Shunt coil
• c. Variable resistor
• d. Series field coil

Answer: c. Variable resistor

Description: In most inteimittent wiper controls, a variable resistor provides a voltage input to the intermittent wiper module.

3. What is the most likely cause for the constant operation of a wiper system?

• a. A faulty or stuck switch
• b. A defective park mechanism
• c. Excessive resistance in the circuit
• d. A shorted controlling circuit

Answer: a. A faulty or stuck switch

Description: The most likely cause for the constant operation of a wiper system is a faulty or stuck switch.

4. When checking the wiper system, what should you never allow the wipers to do?

• a. Operate at high speed
• b. Run continuously across a dry windshield
• c. Park in the wrong position
• d. Operate intermittently

Answer: b. Run continuously across a dry windshield

Description: When checking the wiper system, you should never allow the wipers to run continuously across a dry windshield.

5. Which component of the windshield washer system forces washer fluid through the hoses to the washer nozzles?

• a. Washer switch
• b. Washer pump
• c. Washer reservoir
• d. Washer nozzle

Answer: b. Washer pump

Description: The washer pump forces washer fluid through the hoses to the washer nozzles.

6. If the wipers work intermittently, what is the most likely cause?

• a. A loose wire or connector
• b. A defective park mechanism
• c. Excessive resistance in the circuit
• d. A shorted controlling circuit

Answer: a. A loose wire or connector

Description: The most likely cause for intermittently working wipers is a loose wire or connector.

7. What provides the voltage for the horn circuit in many vehicles?

• a. Horn switch
• b. Fuse link
• c. Horn relay
• d. Positive battery terminal

Answer: d. Positive battery terminal

Description: The voltage for the horn circuit in many vehicles is supplied from the positive battery terminal.

8. What is the purpose of the shunt coil in a wiper motor?

• a. To create a strong magnetic field
• b. To induce a voltage in the armature windings
• c. To reduce current flow through the series coil
• d. To slow the armature

Answer: a. To create a strong magnetic field

Description: The purpose of the shunt coil in a wiper motor is to create a strong magnetic field.

9. What is the most likely cause for the weak operation of a horn?

• a. A misadjusted horn
• b. A faulty horn relay
• c. A loose wire or connector
• d. Excessive resistance in the circuit

Answer: d. Excessive resistance in the circuit

Description: The most likely cause for the weak operation of a horn is excessive resistance in the circuit.

10. What should be checked first when diagnosing the cause of a malfunctioning windshield washer system?

• a. Washer pump
• b. Fluid level in the reservoir
• c. Wiring connections
• d. Washer switch

Answer: b.Fluid level in the reservoir

Description: When diagnosing the cause of a malfunctioning windshield washer system, the fluid level in the reservoir should be checked first. If the fluid level is low, it should be refilled before moving on to other components of the system.

Accessories Diagnosis and Repair - Quizz

1. When diagnosing a cruise control system, which component might cause erratic or no operation?

• a. Speedometer cable
• b. Brake switch
• c. Throttle linkage
• d. Fuel pump

Answer: b. Brake switch

Description: A defective brake switch can cause erratic or no cruise control operation.

2. What is the purpose of a vent and vacuum solenoid in a cruise control system?

• a. To supply power to the control module
• b. To supply the proper vacuum to the servo diaphragm
• c. To control the throttle opening
• d. To adjust the cruise control cable

Answer: b. To supply the proper vacuum to the servo diaphragm

Description: The vent and vacuum solenoids supply the proper vacuum to the servo diaphragm, which provides the desired throttle opening.

3. What is the most common cause of false alarms in anti-theft systems?

• a. Overly adjusted sensors
• b. Rusty door sensors
• c. Misplaced sensors
• d. Worn-out moving parts

Answer: c. Misplaced sensors

Description: Misplaced sensors are the most common cause of false alarms in anti-theft systems.

4. What is the primary function of a passive anti-theft system?

• a. To sound the vehicle’s horn
• b. To disable the starter system, fuel delivery system, ignition system, or any or all of these systems
• c. The system is armed when a sequence of events happens that automatically arm the system
• d. To detect attempts to break into one of its coverage zones

Answer: b. To disable the starter system, fuel delivery system, ignition system, or any or all of these systems

Description: A passive anti-theft system is designed only to start the car when the correct key is inserted into the ignition. The system will disable the starter system, fuel delivery system, ignition system, or any or all of these systems if the right ignition key is not used.

5. What tool is recommended for testing the components of an anti-theft system?

• a. Ohmmeter
• b. Powered test light
• c. Voltmeter
• d. Pneumatic tool

Answer: c. Voltmeter

Description: A voltmeter is recommended for testing the components of an anti¬theft system.

6. When servicing an airbag system, what should you do first?

• a. Test the airbag system
• b. Disconnect the negative battery cable
• c. Inspect the airbags for any signs of damage
• d. Use a diagnostic tool to retrieve any stored codes

Answer: b. Disconnect the negative battery cable

Description: When sei-vicing an airbag system, the first step is to disconnect the negative battery cable and wait for the manufacturer’s specified time period to elapse.

7. What should you wear when handling deployed airbags?

• a. Safety glasses and gloves
• b. A lab coat and goggles
• c. A respirator and a face shield
• d. A hazmat suit and gloves

Answer: a. Safety glasses and gloves

Description: When handling deployed airbags, wear safety glasses and gloves to protect against residual chemicals.

8. What should you do after repairing or replacing components of an airbag system?

• a. Test the airbag system
• b. Inspect the airbags for any signs of damage
• c. Clear any stored codes using a diagnostic tool
• d. Disconnect the negative battery cable

Answer: c. Clear any stored codes using a diagnostic tool

Description: After repairing or replacing components of an airbag system, clear any stored codes using a diagnostic tool.

9. What can cause improper operation of motorized seat belts?

• a. Faulty motors, switches, modules, and limit switches
• b. Worn-out brake switches and cables
• c. Debris or obstructions in the door tracks
• d. Rusty door sensors

Answer: a. Faulty motors, switches, modules, and limit switches

Description: Improper operation of motorized seat belts can be caused by faulty motors, switches, modules, and limit switches.

10. How should you diagnose a motorized seat belt system?

• a. Check the fuses, motors, and the module
• b. Use an ohmmeter to test the circuit
• c. Use a powered test light to diagnose the system D Inspect the airbags for any signs of damage

Answer: a. Check the fuses, motors, and the module

Description: When diagnosing a motorized seat belt system, check the fuses, motors, and the module for any defects or issues.

Good Luck!

👉 Mastering Electrical and Electronic Systems Diagnosis

👉 Mastering ASE Testing - The Ultimate Guide for Success

👉 Batteries - The Heart of Vehicle Power - Diagnosis and Service

👉 Ignition Unveiled - Starting System Diagnosis and Repair

👉 Keeping Current - Charging System Diagnosis and Repair

👉 Illuminating the Road - Lighting Systems Diagnosis and Repair](/posts/illuminating-the-road-lighting-systems-diagnosis-and-repair)

👉 Monitoring and Alert Systems - Gauges, Warnings, and Driver Info Diagnosis

👉 Sounding Off - Horn and Wiper/Washer Systems Diagnosis

👉 Enhancing the Ride - Accessories Diagnosis and Repair