Test A-1: Malfunction Indicator Light (Mil) Inoperative

When ignition is on, main relay is energized and supplies PCM with battery voltage. As PCM is supplied with ignition power, MIL turns on. After engine starts, MIL will turn off if no malfunction is detected. If a malfunction is detected, MIL will remain on until system is repaired.

1. Turn ignition on. Observe instrument cluster warning lights. If all warning lights come on except MIL, go to next step. If no warning lights come on, check for blown fuses, faulty ignition switch, or poor connection at instrument cluster. Repair as necessary.
2. Attempt to start engine. If engine does not start, go to TEST A-3  . If engine starts, turn ignition off and disconnect PCM harness connectors. Using a fused jumper wire, connect PCM harness connector "A", terminal No. 17 (Purple/Yellow wire) to ground. Turn ignition on. If MIL comes on, replace PCM. If MIL does not come on, repair open in Purple/Yellow wire or replace faulty MIL bulb. Retest system.