1. Turn the ignition switch to the RUN position.
2. Disconnect the engine coolant temperature (ECT) sensor.
3. Connect a fused jumper wire from the engine coolant temperature sensor connector, cavity A to ground. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the temperature gauge move to HOT?

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Go to Step 2

Go to Step 3

Replace the ECT sensor. Refer to Engine Coolant Temperature Sensor Replacement , Engine Coolant Temperature Sensor Replacement 5.7L, Engine Coolant Temperature Sensor Replacement 6.5L (L57), Engine Coolant Temperature Sensor Replacement 6.5L (L65), or Engine Coolant Temperature Sensor Replacement 7.4L in Engine Controls.

Is the repair complete?

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System OK

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1. Remove the fused jumper wire from the ECT sensor connector.
2. Backprobe the instrument cluster with a fused jumper wire from cavity 13 to ground.

Does the temperature gauge move to HOT?

--

Go to Step 4

Go to Step 5

Repair the open in CKT 35 (DK GRN) between the instrument cluster connector, cavity 13 and the ECT sensor connector, cavity A.

Is the repair complete?

--

System OK

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Replace the temperature gauge.

Is the repair complete?

--

System OK

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