Engine Coolant Temperature Indicator Malfunction

Engine Coolant Temperature Indicator Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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 Verification

1. Ignition ON, verify that the engine coolant temperature indicator illuminates during the self test when the ignition is turned ON.

• If the temperature indicator does not illuminate, replace the IPC.

2. Ignition ON, verify that the scan tool Engine Coolant Temperature (ECT) Sensor parameter is within the temperature range shown on the engine coolant temperature gage.

• If not within the specified range, replace the IPC.

3. If the temperature gage is normal, refer to Engine Overheating. Engine Overheating

Repair Instructions

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