Engine Temperature Sensor: Testing and Inspection

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [13B-MSP]

NOTE:
- Before performing the following inspection, make sure to follow the troubleshooting flowchart. Initial Inspection and Diagnostic Overview

Resistance Inspection

1. Remove the battery cover. Removal and Replacement)

2. Disconnect the negative battery cable.

3. Remove the generator. (See Removal and Replacement)

4. Drain the engine coolant. (See Service and Repair)

5. Disconnect the ECT sensor connector.

6. Remove the ECT sensor. Service and Repair

7. Place the detection part of the ECT sensor in water and verify that the resistance between ECT sensor terminals A and B is as indicated in the table while gradually increasing water temperature.

- If the monitor item condition/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
- If not within the specification, replace the ECT sensor. Service and Repair

ECT sensor resistance





Circuit Open/Short Inspection

1. Disconnect the PCM connector.

2. Disconnect the ECT sensor connector.

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






Open circuit

- If there is no continuity in the following wiring harnesses, 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 at the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.

- ECT sensor terminal A and body ground
- ECT sensor terminal A and power supply