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

Coolant Temperature Sensor Test:

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.




TEMPERATURE RESISTANCE (OHMS)

°C °F MIN MAX


-40 -4O 291,490 381,710

-20 -4 85,850 108,390

-10 14 49,250 61,430

0 32 29,330 35,990

10 50 17,990 21,810

20 68 11,370 13,610

25 77 9,120 10,880

30 86 7,370 8,750

40 104 4,900 5,750

50 122 3,330 3,880

60 14O 2,310 2,670

70 158 1,630 1,870

80 176 1,170 1,340

90 194 860 970

100 212 640 720

110 230 480 540

120 248 370 410