Operate the engine and compare the actual engine coolant temperature with the temperature indicated by the instrument cluster temperature gauge.

Is the deviation between the actual engine coolant temperature and the indicated coolant temperature within the specified value?

-1°C (30°F)

Go to Step 2

Go to Step 3

This indicates that the temperature gauge is functioning properly. Check the engine cooling system operation if appropriate.

Has the condition been resolved?

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System OK

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1. Disconnect the connector at the engine coolant temperature sensor.
2. Place the ignition switch in the RUN position.
3. Connect a fused jumper wire between terminal A (Diesel) or C (Gas) of the engine coolant temperature sensor connector and ground.

Does the temperature gauge indicate hot?

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Go to Step 6

Go to Step 4

1. Disconnect the connector at the instrument cluster.
2. Connect a J 39200 DMM between terminal 16 of the instrument cluster connector C3 and terminal B of the engine coolant temperature gauge sensor connector for CKT 23, CKT 257, CKT 96, or CKT 37 (GRN).

Does the DMM indicate continuity?

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Go to Step 7

Go to Step 5

Repair the open in CKT 23, CKT 257, CKT 96, or CKT 37 (GRN) between the engine coolant temperature gauge sensor and the instrument cluster.

Is the repair complete?

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System OK

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Replace the engine coolant temperature sensor. Refer to Engine Coolant Temperature Sensor Replacement .

Is the repair complete?

System OK

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Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

System OK

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