Engine Coolant Temperature Indicator Always On

Engine Coolant Temperature Indicator Always On

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information]. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

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
^ [Engine Overheating]
^ [Instrument Cluster Replacement]

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