Engine Temperature Sensor: Testing and Inspection

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3]

NOTE: Perform the following inspection only when directed.

ECT Sensor Resistance Inspection

1. Drain the engine coolant.
2. Remove the ECT sensor (located above the starter).
3. Place the ECT sensor in water with a thermometer, and heat the water
4. Measure the resistance between the ECT sensor terminals A and B using an ohmmeter.




- If not as specified, replace the ECT sensor.
- If the ECT sensor is normal, but PID value is out of SPECIFICATION, perform the "Circuit Open/ Short Inspection".

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- ECT sensor terminal A and PCM terminal 2AH
- ECT sensor terminal B and PCM terminal 2AY

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness,
- ECT sensor terminal A and power supply
- ECT sensor terminal A and body GND
- ECT sensor terminal B and power supply