Engine Coolant Temperature Indicator Malfunction

Engine Coolant Temperature Indicator Malfunction

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) illuminates the engine coolant temperature indicator when the engine control module (ECM) determines that the coolant temperature is more than 128°C (262°F). The IPC receives a serial data message from the BCM requesting the illumination of the engine coolant temperature indicator. The IPC turns the engine coolant temperature indicator ON and OFF during the display test to verify the indicator is working properly at the start of each ignition cycle.

Reference Information

Schematic Reference

* Instrument Cluster Schematics Instrument Cluster Schematics

* Engine Cooling Schematics [1][2]Cooling System

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (MN5)

Description and Operation

* Instrument Cluster Description and Operation Instrument Cluster

* Cooling Fan Description and Operation (2.4L) Cooling Fan (2.4L)Cooling Fan Description and Operation (3.0L) Cooling Fan (3.0L)

* Indicator/Warning Message Description and Operation Indicator/Warning Message

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 Programming and Relearning for scan tool information

Circuit/System Verification

1. Ignition ON, verify that the engine coolant temperature indicator performs a bulb test when the ignition is turned ON.

• If the engine coolant temperature indicator does not perform a bulb test, replace the IPC.

2. Ignition ON, verify that the scan tool Engine Coolant Temperature (ECT) Sensor parameter is less than 248°F (120°C).

• If greater than the specified value, refer to Engine Overheating Engine Overheating.

Repair Instructions

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

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