Diagnostic Aids

Inspect for the following conditions:

• Check for a faulty indicator bulb or an open in the instrument cluster power circuit if engine starts and runs okay.
• Check for a faulty main relay if there is no MIL and engine cranks but will not start.
• A MIL that is dim or not illuminated steady can be caused by an inadequate PCM ground. Inspect G102 for a clean, tight connection.
• A faulty electrical connection to the PCM.

An intermittent malfunction may be caused by a fault in the MIL electrical circuit. Inspect the wiring harness and components for an intermittent condition. Refer to INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.