1

Allow the engine to cool to room temperature.

With the ignition ON, does the temperature gage always read at the high end of the scale?

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Go to Step 7

Go to Step 2

Disconnect engine control module (ECM) electrical connector.

Does the temperature gage indicator drop to the low end of the scale?

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Go to Step 3

Inspect for a short to ground between the ECM and the temperature gage.

Is there a short to ground?

--

Go to Step 4

Go to Step 5

Repair the short to ground.

Is the repair complete?

--

System OK

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Replace the temperature gage.

Is the repair complete?

--

System OK

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1. Disconnect the ECM.
2. Turn the ignition ON.
3. Check the voltage at the ECM.

Does the voltage equal the value specified?

11-14 V

Go to Step 9

Go to Step 7

Inspect for an open circuit between the ECM and the temperature gage.

Is there an open circuit?

--

Go to Step 8

Go to Step 5

Repair the open circuit between the ECM and the temperature gage.

Is the repair complete?

--

System OK

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1. Disconnect the ECM.
2. Connect a jumper wire between the ECM connector and ground.
3. Turn the ignition ON.

Does the temperature gage move to the high end of the scale?

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Go to Step 5