For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit/System Description
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.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, scan tool installed, perform the Coolant Temperature Telltale Test. Verify that the engine coolant temperature indicator turns ON and OFF when commanded.
- Ignition ON, verify that the scan tool Engine Coolant Temperature parameter is less than 248°F (120°C).
| ⇒ | If the engine coolant temperature indicator does not turn ON and OFF when commanded, replace the IPC. |
| ⇒ | If greater than the specified value, refer to Engine Overheating. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the IPC replacement, setup, and programming
