ASE A6 Electrical Electronics Practice Test

56. A vehicle's body ground strap is burned and beginning to separate. Which of these could be the cause?

  • A. Worn starter brushes.
  • B. Resistance in the starter ground circuit.
  • C. A loose body ground connection.
  • D. A loose engine ground connection.

56.

Answer A is wrong. Worn starter brushes result in a slow cranking starter.

Answer B is wrong. Resistance in the starter ground circuit results in a slow cranking starter.

Answer C is wrong. The body ground is of a smaller gauge and provides a ground for the vehicle's accessories.

Answer D is correct. Electricity always seeks the easiest path to ground. A loose engine ground causes excessive current to flow through smaller body ground on its way back to the battery. The excessive current will damage the thinner cable.

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57. Full-fielding an alternator:

  • A. Bypasses the alternator's stator.
  • B. Produces zero voltage output.
  • C. Bypasses the alternator's voltage regulator.
  • D. Has no effect on voltage output.

57.

Answer A is wrong. The stator produces a magnetic field in an alternator.

Answer B is wrong. Charging voltage can be regulated using an electro-mechanical, electronic, or computer-controlled regulator.

Answer C is correct. Full-fielding an alternator bypasses the voltage regulator and produces maximum output.

Answer D is wrong. The increased field current increases the magnetic field created inside the alternator.

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58. The plug leading from the harness to an airbag sensor is MOST likely:

  • A. Yellow
  • B. Red
  • C. White
  • D. Black

58.

Answer A is correct. The plug will most likely be yellow.

Answer B is wrong. The airbag module contains the airbag and the inflator assembly incorporated into a module compact enough to fit into a steering wheel, passenger dash, or the side of the front seat.

Answer C is wrong. Sensors are behind the front bumper and inside the passenger compartment.

Answer D is wrong. Yellow tape is also available for airbag systems.

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59. There is excessive resistance at point A in the heated seat circuit above. Technician A says the two heated seat elements are part of a series circuit. Technician B says this resistance will affect both heating elements. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

59.

Answer A is wrong. This is a diagram of a series circuit; series circuits are different from parallel circuits. In parallel circuits, one of the components can fail without affecting the others.

Answer B is wrong. In a series circuit, an open or resistance in a wire or plug affects both elements.

Answer C is correct. Both technicians are correct.

Answer D is wrong. The module uses the signal from the NTC sensor for safety and to regulate temperatures for HI and LOW settings. Learn more about this circuit in the read more section.

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60. With the engine running the voltage between pin 6 and ground measures 3.00 Vdc and the voltage between pin 14 and ground measures 2.00 Vdc. Technician A says this is normal. Technician B says these readings indicate crossed wires or shorted connector pins. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

60.

Answer A is correct. The reading changes with the activity on the bus. Typically the measurement is taken from the OBD II DLC of a system without a gateway or by back-probing the CAN HI and CAN LO pins of an easy-to-access control module's connector on a system with a gateway. The signal should be above 2.5 Vdc on the CAN HI wire and below 2.5 Vdc on the CAN LO wire.

Answer B is wrong. When CAN HI shorts to CAN LO, the voltage will remain around 2.5 Vdc on both wires.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

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