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.




USING VOLTMETER




TROUBLESHOOTING PROCEDURE

TROUBLESHOOTING HINTS
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.