Component Testing
- Ignition OFF, disconnect the harness connector at the engine coolant temperature (ECT) sensor.
- Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance - Engine Coolant Temperature Sensor
table and verify that the resistance is within 5 % of the specification.
- If not within the specified range, replace the ECT sensor.
NOTE:
A thermometer can be used to test the sensor off the vehicle.