Engine Coolant Temperature Gage Inaccurate or Inoperative. Chevrolet PJJ 2001

For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Instrument Cluster Diagnostic System Check? | Go to Step 2 | Go to A Diagnostic System Check - Instrument Cluster

2

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. Observe the ECT parameter in the powertrain control module (PCM) ENGINE DATA 1 data display.

Does the scan tool indicate that the ECT parameter is the same as the engine coolant temperature gauge?

Go to A Powertrain On Board Diagnostic (OBD) System Check in Engine Controls

Go to Step 3

3 | Replace the instrument cluster (IPC). Refer to IP Cluster Replacement. Did you complete the repair? | Go to Step 4 | --
4 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2