Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection

CIRCUIT DIAGRAM







HARNESS INSPECTION PROCEDURES







SENSOR INSPECTION
1. Remove the engine coolant temperature sensor from the intake manifold.
2. With temperature sensing portion of engine coolant temperature sensor immersed in hot water, check resistance.
3. If the resistance deviates from the standard value greatly, replace the sensor.




TROUBLESHOOTING PROCEDURES

HINT: If the fast idle speed is not high enough or the engine gives off dark smoke during the engine warm-up operation, it might be caused by the engine coolant temperature sensor.




USING VOLTMETER




ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSTALLATION
1. Apply sealant LOCTITE 962T or equivalent to threaded portion.
2. Install engine coolant temperature sensor and tighten it to specified torque.

Sensor torque: 15-20 Nm (11-15 ft.lbs.)

3. Connect the harness connector securely.