Malfunction Indicator Lamp (MIL) On Steady

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

When the ignition is turned ON, the Malfunction Indicator Lamp (MIL) will momentarily flash ON then OFF and remain ON until the engine is running, if no Diagnostic Trouble Codes (DTC) are stored. Battery voltage is supplied through the ignition switch directly to the MIL telltale. The Powertrain Control Module (PCM) controls the MIL by providing a ground path through the MIL control circuit to turn ON the MIL.


TEST DESCRIPTION

The number(s) below refer(s) to the step number(s) on the Diagnostic Table.

1. The Powertrain OBD System Check prompts you to complete some of the basic checks and to store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data captured when the malfunction occurred. The scan tool stores this information for later reference.

2. When the ignition switches turned ON, the MIL should momentarily flash ON and OFF, then remain ON until the engine is running or it an emission related DTC stores.

3. This step checks the ability of the PCM to control the MIL. The scan tool has the ability to command the MIL ON and OFF.

5. A shorted MIL circuit can be diagnosed with a scan tool. Refer to PCM Outputs Diagnosis.
PCM Outputs Diagnosis

6. For Instrument Panel Cluster (IPC) replacement procedures, refer to Instrument Panel.

7. Reprogram the PCM and perform the crankshaft position system variation learning procedure. Refer to the latest Techline information for PCM programming and Crankshaft Position (CKP) System Variation Learn Procedure for the Crankshaft Position System Variation Learning Procedure.