Did you perform the Instrument Cluster System Check?

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Go to Step 2

Go to Instrument Cluster System Check

1. Disconnect the connector at the Engine Coolant Temperature Sender.
2. Connect one red lead of the J 33431-C to connector cavity A of the Engine Coolant Temperature Sender connector.
3. Connect the other lead of the J 33431-C to ground.
4. Turn the ignition switch to the RUN position.
5. Adjust the resistance dial to 1305 ohms and then to 49.5 ohms.

Does the temperature gauge match the values given?

1305ohms Cold, approx. 100°F (Gas)/160°F (Diesel). 49.5ohms Hot, approx. 260°F.

Go to Step 3

Go to Step 4

Replace the Engine Coolant Temperature Sender. Refer to Engine Coolant Temperature Sensor Replacement in Engine Cooling, 1999 C/K Service Manual.

Is the repair complete?

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Go to Instrument Cluster System Check

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1. Remove the I/P Cluster.
2. Connect a B+, 10 amp fused jumper wire to cavity 31 of the I/P Cluster assembly.
3. Connect one red lead of the J 33431-C to cavity 9 of the I/P Cluster assembly.
4. Connect the other lead of the J 33431-C to ground.
5. Adjust the resistance dial to 1305 ohms and then to 49.5 ohms.

Does the temperature gauge match the values given?

1305ohms Cold, approx. 100°F (Gas)/160°F (Diesel). 49.5ohms Hot, approx. 260°F.

Go to Step 5

Go to Step 6

Locate and repair the cause of resistance in CKT 35 (DK GRN) between the I/P Cluster and the Engine Coolant Temperature Sender. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Instrument Cluster System Check

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Replace the I/P Cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Instrument Cluster System Check

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