For 1990-2009 cars

### 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 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.