ASE A6 Electrical Electronics Practice Test

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6. There are codes indicating a misfire in number 1 and 4 cylinders of a four cylinder engine. View the diagram above, and determine which of the following is MOST likely causing this condition?

  • A. There is an open at point A in the system.
  • B. There is an open at point B in the system.
  • C. There is an open at point C in the system.
  • D. There is excessive resistance at point D of the system.

6.

Answer A is wrong. Point A is a common ground for both drivers. Drivers are transistors. The computer uses them to control different actuators, like the coils shown above, usually by grounding the control circuit.

Answer B is correct. An open at point B results in no voltage input to the coil and a misfire code at both the number 1 and 4 cylinders.

Answer C is wrong. An open in the 2-3 coil’s power circuit will result in a no-spark problem with that coil only.

Answer D is wrong. Resistance in the crankshaft position sensor’s circuit will result in a corrupt signal and most likely a no-spark condition at both coils.

7. 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?

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

7.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. Electrical components that use the chassis ground will suffer high resistance in the ground circuit if the mounting bolts are loose. Many horns, windshield wiper motors, and aftermarket parts use the chassis/body ground.

Answer D is wrong. Both technicians are correct.

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8. The engine’s electric cooling fan in the illustration operates continuously whenever the ignition is switched ON or the engine is running, even when it’s cold. Which of the following would result in this continuous fan motor operation?

  • A. Excessive resistance at point A of the system.
  • B. An open at point B in the system.
  • C. A short to ground at point C in the system.
  • D. An open at point D of the system.

8.

Answer A is wrong. This is the engine coolant temperature sensor. Resistance in this circuit will corrupt the signal from the sensor.

Answer B is wrong. An open at point B results in no fan operation. This is because the control module is unable to control (ground) the open circuit.

Answer C is correct. A short to ground at point C activates the relay causing the fan to run when the ignition is switched on, even when the engine is cold.

Answer D is wrong. An open at point D will prevent fan motor operation.

Electrical symbol.

9. The electrical symbol above is a:

  • A. Splice
  • B. Connector
  • C. Inductor
  • D. Resistor

9.

Electrical symbol.

Answer A is wrong. This is the standard symbol for a connector.

Answer B is correct. It's found in automotive schematics.

Answer C is wrong. Technician B is correct. Perform a voltage drop test on a problem connector to check for excessive resistance.

Answer D is wrong. Technician B is correct.

10. A pedal mounted brake switch is being tested with a voltmeter. The pedal is depressed, and there is power at the switch, but no power coming out. Technician A says with the brake pedal depressed, there should be power present at both ends of the brake switch. Technician B says this condition indicates that there is an open in this brake switch. Who is correct?

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

10.

Answer A is wrong. When the pedal is depressed, the brake switch completes the circuit supplying power to the brake lights.

Answer B is wrong. Power should be present at both terminals of the brake switch when the brake pedal is applied.

Answer C is correct. Both A and B are correct.

Answer D is wrong. Both A and B are correct.