GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

DEFINITION: The Engine Hot indicator is always ON.

1

Did you perform the Engine Cooling Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Cooling

2

Start the engine.

Does the Check Gages indicator illuminate?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Install a scan tool.
  2. With the scan tool, observe the ECT Sensor parameter in the powertrain control module (PCM) data list.

Does the scan tool indicate that the ECT Sensor parameter is within the temperature range shown on the temperature gage?

Go to Engine Overheating

Go to Step 4

4

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 5

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5

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2