A6 Electrical and Electronic Test

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1. All the lights in a brake light circuit illuminate except one. The MOST likely cause is:
Wastespark ignition system.
2. The number 2 and 3 cylinders of a four cylinder engine are producing less secondary voltage than the 1 and 4 cylinders. According to the diagram above which of the following is causing this condition?
3. If a technician reversed the leads of a digital voltmeter on a 12 volt circuit the readout would show:
4. The hazard and turn signal lights are inoperative. Technician A says that they share the same circuit. Technician B says the vehicle may have a faulty flasher. Who is correct?
Automotive electrical symbol.
5. The electrical symbol in the illustration above indicates:
Door lock circuit.
6. The power door locks in the diagram above unlock only. There is no locking action. Which of the following is causing this condition?
7. Technician A says the OBD II DLC connector is located in the cabin near the steering wheel. Technician B says to use the OBD II DLC connector to test resistance in the CAN (Controller Area Network). Who is correct?
8. A CAN-FD controller area network is being discussed. Which of these is correct?
Fan circuit.
9. The electric radiator cooling fan in the illustration does not operate under any condition. All of the following result in an inoperative fan motor EXCEPT:
10. With the brake pedal depressed there is 12.6 volts present at the input to the brake switch, but no voltage at the output. Technician A says there should be battery voltage present at both ends of the brake switch. Technician B says these results indicate that the brake switch is faulty. Who is correct?
Automotive electrical symbol
11. The electrical symbol above is:
12. Two technicians are discussing a burned fuse element in a fan circuit. Technician A says the burned fuse was caused by high resistance in the fan circuit. Technician B says the burned fuse was the result of an open in this circuit. Who is correct?
13. Technician A says to use a scan tool and a multimeter to test the cruise control switch in an inoperative cruise control system. Technician B says the cruise control system may not disengage if there’s a problem with the brake switch. Who is correct?
14. An electric seat will not move backward or forward. A noise is heard coming from the seat when the switch is pressed. The MOST likely cause of this problem is:
15. Two technicians are discussing an analog transmission range sensor on a late model vehicle. Technician A says that since these sensors use resistance to indicate gear selection, they can be tested with an ohmmeter. Technician B says to start the car and make sure the circuit is powered before using the ohmmeter. Who is correct?
16. Which solder should be used when repairing an automotive electrical connection?
17. A technician is testing a clutch safety switch in a vehicle with a no-start condition. All of the following are correct about this switch EXCEPT:
18. Technician A says a voltage limiter is used in an instrument panel to keep the voltage at 5 volts. Technician B says if the limiter is faulty, it may result in high gauge readings. Who is correct?
Multimeter reading
19. The display on the multimeter above indicates:
Oscilloscope TP Sensor waveform
20. Two technicians are discussing the waveform in the image above. Technician A says the TP sensor in the image is defective. Technician B says the vehicle may hesitate during acceleration. Who is correct?
21. A vehicle's factory alarm system activates on its own. Technician A says this could be a faulty courtesy light switch. Technician B says the alarm system's control module uses current sensitive switches. Who is correct?
Electrical symbol
22. The electrical symbol above is:
23. A vehicle’s battery discharges overnight even after it passes testing and has been fully charged the day before. Technician A says to ensure that all lighting, accessories and control modules power down and remain OFF when the vehicle is shut down. Technician B says to run a parasitic drain test to find the circuit causing the battery drain. Who is correct?
Electric AC compressor.
24. During an inspection the technician notices a large orange cable leading to a component. Technician A says this could be a high voltage cable powering the vehicle’s AC compressor. Technician B says manufacturers use cable coloring, warning labels, and signs to warn technicians of possible hazards. Who is correct?
25. An alternator output test is being performed on a vehicle's charging system. Technician A says engine idle must be increased during this test. Technician B says the vehicle's accessories must be turned on during this test. Who is correct?
26. A technician is performing a starter current draw test on a four-cylinder engine. The engine cranks slowly and has a current draw of 340 amps. Which of these is correct?
27. A vehicle’s dome light is inoperative. The technician replaces the recommended 15 amp fuse and the element melts immediately. Technician A says this could be caused by a short circuit. Technician B says to use a 20 amp fuse for added protection. Who is correct?
28. The driver's power window moves very slowly and the window switch must be pressed several times to open or close the window. All of these could cause this problem EXCEPT:
Parking Brake Circuit
29. The parking brake warning light in the diagram is continuously illuminated. Which of the following is causing this condition?
30. Technician A says to use the scan tool's datastream to evaluate input from the (ECT) engine coolant temperature sensor. Technician B says the resistance of a (NTC) negative temperature coefficient sensor decreases as temperature increases. Who is correct?
Heated Seat Circuit
31. There’s an open at point A in the heated seat circuit above. Technician A says this will only affect the heating element in the backrest. Technician B says the two heating elements are part of a parallel circuit. Who is correct?
32. Technician A says changing the alternator’s field current changes the alternator's voltage output. Technician B says the control module adjusts voltage regulation according to battery temperature and voltage. Who is correct?
33. A technician is looking for the wire to an airbag sensor. The color of this airbag sensor's wire is MOST likely:
34. The engine ground strap is burned and separated. Which of the following is correct?
35. A vehicle's engine will not crank. Technician A says to check the starter circuit first. Technician B says to check the condition of the battery first. Who is correct?
Starter voltage drop test.
36. An engine's starter is cranking slowly. The battery has passed all testing. While cranking the engine, the voltage readings at the battery and starter both indicate 10.03 volts. Technician A says these test results indicate a bad starter. Technician B says there is too much resistance in the positive battery cable. Who is correct?
Electrical symbol
37. The electrical symbol above is :
38. An alternator suffers from low voltage output. The alternator outputs maximum voltage when full-fielded. Which of the following is MOST likely at fault?
39. Technician A says a fully charged lead acid automotive battery has a specific gravity of 1.265 at 80° F. Technician B says the battery's specific gravity is affected by temperature. Who is correct?
40. A vehicle's air conditioner blower motor will only work if the selector is in the high position. Technician A says to check the blower motor resistor. Technician B says this is most likely a loose ground connection. Who is correct?
41. A full-fielded 70 amp alternator only produces 45 amps. The MOST likely cause of this is:
42. The cruise control system of a vehicle is being diagnosed for intermittent operation. Which of the following components is LEAST likely to affect its operation?
43. There are no brake lights when the brake pedal is depressed. Technician A says this is most likely caused by a bad brake light bulb. Technician B says this is most likely caused by a blown stop light fuse. Which technician is correct?
44. The headlights get brighter as a vehicle is accelerated. Technician A says this is caused by a high capacity battery. Technician B says this is caused by high charging system voltage. Who is correct?
45. A scan indicates the electronic battery sensor located on the negative battery terminal is faulty. Technician A says the faulty battery sensor can affect the vehicle’s charging system. Technician B says this will affect the vehicle’s auto start/stop system. Who is correct?
Multimeter amperage reading
46. A vehicle’s battery has discharged overnight. After replacing the battery, a battery drain test is performed. The reading on the multimeter above indicates the parasitic drain. Which of the following is correct?
47. A vehicle has a starting problem. Technician A says to use an ammeter to test starter current draw. Technician B says that worn brushes result in high resistance. Who is correct?
48. The dome light in a vehicle flickers on and off with the switch in the ON position. The MOST likely cause of this problem is:
49. A technician is testing a Negative Temperature Coefficient (NTC) temperature sensor for resistance. Technician A says set the multimeter to Ohms. Technician B says the sensor's resistance should decrease as its temperature increases. Who is correct?
50. All of the following are true about battery replacement EXCEPT:
Wastespark ignition system.
51. The number 1 and 4 cylinders of a four-cylinder engine are misfiring. According to the diagram above, which of the following is MOST likely causing this condition?
52. Technician A says loose mounting can result in an inoperative horn. Technician B says loose mounting can cause an inoperative windshield wiper motor. Who is correct?
Engine cooling fan circuit.
53. The engine’s electric cooling fan operates continuously when the ignition is switched ON, even when cold. According to the diagram above, which of the following is causing this continuous operation?
Electrical symbol.
54. The electrical symbol above is a:
55. All of the following are true statements about a fully charged lead acid battery EXCEPT:
56. A vehicle's battery is being tested for capacity. Technician A says during a battery capacity test the voltage should not drop below 9.6 volts at 70° F. Technician B says a battery's voltage reading should increase as temperature decreases. Who is correct?
Heated seat circuit.
57. There is an NTC negative temperature coefficient sensor in the heated seat circuit above. Technician A says that control modules use NTC sensors to measure temperature. Technician B says the two heating elements run in series with each other. Who is correct?
Door lock circuit.
58. All of the following are true about the circuit in the diagram above EXCEPT:
59. Technician A says that the charge indicator of a maintenance free battery is a hydrometer measuring the density of the electrolyte solution. Technician B says that as the battery is discharged the electrolyte solution’s specific gravity gets closer to 1.0. Who is correct?
60. The wiper motor is receiving battery voltage and functioning properly, but the windshield wipers are slow and dragging across the windshield. Technician A says this could be an open circuit at the motors ground. Technician B says the wiper linkage is binding. Who is correct?
Please select an answer
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