ASE A7 Heating Air Conditioning Practice Test

Automotive ECT sensor.

41. Component A in the electrical diagram above has all of the following characteristics EXCEPT:

  • A. It is a Negative Temperature Coefficient sensor.
  • B. It is a thermistor.
  • C. It is a variable resistor.
  • D. It is a switch.

41.

ECT sensor

Answer A is wrong. An ECT sensor is an (NTC) Negative Temperature Coefficient sensor.

Answer B is wrong. An engine coolant temperature sensor is a thermistor.

Answer C is wrong. An engine coolant temperature sensor is a variable resistor that modifies a 5-volt reference signal from the control module.

Answer D is correct. A/C systems use either open or closed switches. Sensors modify reference signals.

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