ASE A7 Heating Air Conditioning Practice Test

Diagram of automotive ac control circuit.

37. Corrosion at point A of the electrical diagram above results in:

  • A. Excessive resistance in the splice leading to the high-pressure sensor.
  • B. Voltage drop at the connector of the signal circuit for the high-pressure sensor.
  • C. Excessive resistance in the reference circuit of the high-pressure sensor.
  • D. Voltage drop at the connector of the ground circuit for the high-pressure sensor.

37.

Answer A is wrong. The symbol indicates that the component is a connector, not a splice.

Answer B is correct. This is a three-wire sensor. There is a ground circuit, then the signal circuit back to the control module, and the third wire is the 5-volt reference circuit.

Answer C is wrong. The signal circuit's connector is corroded.

Answer D is wrong. It's a sensor; A/C systems also use switches that are either open or closed. They don't modify reference signals like sensors do.

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