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

NOTE:
To perform a complete test of the Coolant Temperature Sensor and its circuitry, refer to the DRB II diagnostic tester. Also refer to the appropriate Diagnostic Charts. To test the sensor only, refer to the following:

PROCEDURE

1. Turn the ignition key to the OFF position.

2. Disconnect wire connector from coolant temperature sensor.

NOTE: Engines with air conditioning: When removing the connector from sensor, do not pull directly on wiring harness. Fabricate an L shaped hook tool from a coat hanger (approximately eight inches long). Place the hook part of tool under the connector for removal. The connector is snapped onto the sensor. It is not equipped with a lock type tab.

3. Connect one lead of ohmmeter to one terminal of coolant temperature sensor.

4. Connect the other lead of ohmmeter to remaining terminal of coolant temperature sensor.

^ For resistance (in ohms) at given temperatures, See Specifications.

^ Replace sensor if resistance readings are incorrect.