Practice question

A diagnostic scanner shows a high-voltage reading from an Engine Coolant Temperature (ECT) sensor. What is the most likely circuit fault?

  1. The ECT sensor signal wire is shorted to the engine ground
  2. The ECT sensor circuit has an open circuit (break in wire or disconnected connector)
  3. The ECT sensor is overheating due to a stuck-open coolant thermostat
  4. The sensor reference voltage has dropped to zero volts

Answer: B — The ECT sensor circuit has an open circuit (break in wire or disconnected connector)

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