The instrument panel cluster (IPC) illuminates the engine coolant temperature indicator when the powertrain control module (PCM)/engine control module (ECM) determines that the coolant temperature is more than 128°C (262°F). The IPC receives a serial data message from the PCM/ECM requesting the illumination of the engine coolant temperature indicator.

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that the engine coolant temperature indicator illuminates during the self test when the ignition is turned ON.

⇒	If the temperature indicator does not illuminate, replace the IPC.

2. Ignition ON, verify that the scan tool Engine Coolant Temperature (ECT) Sensor parameter is within the temperature range shown on the engine coolant temperature gage.

⇒	If not within the specified range, replace the IPC.

3. If the temperature gage is normal, refer to Engine Overheating.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the IPC replacement, setup, and programming