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

CIRCUIT DIAGRAM





USING SCAN TOOL








HARNESS INSPECTION PROCEDURES

SENSOR INSPECTION

Sensor Inspection
1. Remove 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.

Installation
1. Apply sealant LOCTITE 962T or equivalent to threaded portion.
2. Install engine coolant temperature sensor and tighten it to specified torque.





3. Connect the harness connector securely.

TROUBLESHOOTING HINTS
If the fast idle speed is not enough or the engine gives off dark smoke during the engine warm-up operation, the engine coolant temperature sensor might be the cause.