Malfunction Indicator Lamp (MIL) Diagnosis (Without OBD II Emissions)

Malfunction Indicator Lamp (MIL) Diagnosis (Without OBD II Emissions)

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

Ignition 1 voltage is supplied directly to the malfunction indicator lamp (MIL). The engine control module (ECM) turns the MIL ON by sending a request to the instrument panel cluster (IPC) via the CAN communication circuit. The MIL should be on steady with the ignition ON and the engine OFF. When the engine is started, the MIL should turn OFF.

Reference Information

Schematic Reference

* Engine Controls Schematics (LE9) [1][2]Electrical Diagrams

* Instrument Cluster Schematics Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left (DH6)

Description and Operation

Instrument Cluster Description and Operation Instrument Cluster

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 Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON, verify that there are no diagnostic trouble codes (DTCs) set.

• If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

2. Engine running, command the MIL ON and OFF with a scan tool. The MIL should respond to the scan tool commands.

• If the MIL does not respond properly, replace the instrument panel cluster.

Repair Instructions

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

Control Module References Control Module References for instrument panel cluster replacement, setup, and programming