Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

1: The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2: Disconnecting the PCM will determine whether the malfunction is caused by a short to ground in the MIL control circuit or a faulty PCM.

Malfunction Indicator Lamp (MIL) Always On

Step	Action	Yes	No
Schematic Reference: Engine Controls Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC information
2	Turn OFF the ignition. Disconnect the powertrain control module (PCM) electrical connector with the malfunction indicator lamp (MIL) control circuit. Turn ON the ignition, with the engine OFF. Is the MIL ON?	Go to Step 3	Go to Step 4
3	Repair the short to ground in the MIL control circuit between the PCM and the instrument panel cluster (IPC) assembly. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Is the action complete?	Go to Step 5	-
4	Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the action complete?	Go to Step 5	-
5	Start the engine and observe the MIL. Does the MIL turn OFF approximately 1 to 2 seconds after the engine is started?	Go to Step 6	Go to Step 2
6	With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed?	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC information	System OK