The instrument panel cluster (IPC) illuminates the engine coolant temperature indicator when the 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 steering column module requesting the illumination of the engine coolant temperature indicator. The engine coolant temperature indicator turns ON and OFF during the bulb test to verify the indicator is working properly at the start of each ignition cycle.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, scan tool installed, perform the Coolant Temperature Telltale Test. Verify that the engine coolant temperature indicator turns ON and OFF when commanded.

⇒	If the engine coolant temperature indicator does not turn ON and OFF when commanded, replace the IPC.

2. Ignition ON, verify that the scan tool Engine Coolant Temperature parameter is less than 248°F (120°C).

⇒	If greater than the specified value, refer to Engine Overheating.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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