ASE A6 Electrical Electronics Practice Test

Fan circuit.

54. An engine is overheating. The electric radiator cooling fan in the illustration does not operate under any condition. All of the following result in this condition EXCEPT:

  • A. A short to ground at point A.
  • B. An open at point B.
  • C. An open at point C.
  • D. An open at point D.
Simple fan circuit explained.

54.

Answer A is correct. All the other answers result in an inoperative fan motor. A short to ground at point A causes the fan motor to operate whenever the ignition is ON.

Answer B is wrong. An open at point B results in no fan operation because the fuse element is open.

Answer C is wrong. An open at point C results in no fan operation because the fan motor is not receiving power.

Answer D is wrong. An open at point D will prevent fan motor operation because it removes the circuit’s ground.

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