Protege DX L4-2.0L DOHC (2002)
Engine - Coolant Temperature Sensor/Switch: Testing and Inspection
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION
NOTE: Perform the following test only when directed.
ECT Sensor Resistance Inspection
1. Drain the engine coolant.
2. Remove the ECT sensor.
3. Place the ECT sensor in water with a thermometer, and heat the water gradually.
Specification
4. Measure the resistance between the ECT sensor terminals A and B using an ohmmeter.
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If not as specified, replace the ECT sensor.
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If the ECT sensor is okay, but PID value or PCM terminal 38 voltage are out of specification, carry out the "Circuit Open/Short Inspection".
ECT sensor signal characteristic (reference)
Circuit Open/Short Inspection