Malfunction Indicator Lamp: Testing and Inspection

MIL CIRCUIT

CIRCUIT DESCRIPTION
The MIL is used to indicate the ECM's detection of a vehicle malfunction.
The instrument panel GAUGE fuse provides circuit power and the ECM provides the circuit ground that illuminates the MIL.

MIL operations should be checked visually:
The MIL should be illuminated when the ignition is first turned on. If the MIL is always ON or OFF, use hand-held tester or OBD II scan tool and follow the procedures below to determine the cause of the problem.

Wiring Diagram:

Step 1 - 4:

INSPECTION PROCEDURE

HINT: Troubleshoot each trouble symptom in accordance with the chart.