Engine Coolant Temperature Gauge Inaccurate or Inoperative

Engine Coolant Temperature Gauge Inaccurate or Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature.

Reference Information

Schematic Reference

* Instrument Cluster Schematics Instrument Cluster Schematics

* Engine Controls Schematics

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Instrument Cluster Description and Operation Instrument Cluster

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the engine coolant gauge sweep test with the scan tool, verify that the engine coolant temperature gauge sweeps from its low to high position.

If the engine coolant gauge does not sweep, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

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