1. Turn the ignition switch to the RUN position.
2. Disconnect the engine coolant temperature (ECT) sensor.
3. Connect the red lead of a J 33431-C to the ECT sensor connector.
4. Connect the other lead of the tester to ground.
5. Set the resistance dial to 1400 ohms.
6. Slowly move the resistance dial to 50 ohms.

Did the temperature gauge read COLD at first and then slowly move to the full HOT position?

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Go to Step 2

Go to Step 3

Replace the ECT sensor. Refer to one of the following procedures in Engine Controls:

Did you complete the repair?

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System OK

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1. Turn the ignition to the OFF position.
2. Disconnect the instrument cluster.
3. Use aJ 39200 DMM in order to measure the resistance between the instrument cluster connector, cavity 13 and the ECT sensor connector, cavity A.

Did the resistance measure greater than the specified value?

5.0 ohms

Go to Step 4

Go to Step 5

Repair the high resistance in CKT 35 (DK GRN) between the instrument cluster connector and the ECT sensor connector.

Did you complete the repair?

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System OK

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Replace the instrument cluster.

Did you complete the repair?

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System OK

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