Engine Coolant Temperature Gage Inaccurate or Inoperative

ENGINE COOLANT TEMPERATURE GAGE INACCURATE OR INOPERATIVE

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

CIRCUIT/SYSTEM DESCRIPTION The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the powertrain control module (PCM) or the engine control module (ECM). The IPC receives a serial data message from the PCM indicating the engine coolant temperature.

REFERENCE INFORMATION

Schematic Reference
Instrument Cluster Schematics

Connector End View Reference
Instrument Panel, Gages, and Console Connector End Views

Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs

Scan Tool Reference
Scan Tool Data List

CIRCUIT/SYSTEM TESTING
1. Install a scan tool
2. Turn ON the ignition, with the engine OFF
3. With the scan tool, under Special Functions, perform the engine coolant gage sweep test.
- If the engine coolant gage does not sweep from its low to high position, replace the IPC.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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