Engine Coolant Temperature Indicator Always On

Engine Coolant Temperature Indicator Always On

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle. Initial Inspection and Diagnostic Overview

Circuit/System Description

The instrument panel cluster (IPC) illuminates the TEMP indicator when the engine control module (ECM) determines that the coolant temperature is more than 128°C (262°F). The IPC receives a discrete input from the ECM requesting illumination.

The IPC illuminates the TEMP indicator during the display test at the start of each ignition cycle.

Circuit/System Testing

With the engine running within the normal operating temperature range, the engine coolant temperature (ECT) indicator should not be illuminated.

If the engine coolant is not within the normal operating range, repair the overheating condition. If the engine coolant is within the normal operating range, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair. Verification Tests

^ Engine Overheating
^ Instrument Cluster Replacement

Repair Verification

Verify that the ECT indicator is OFF while the engine is operating.