Malfunction Indicator Lamp: Description and Operation

Check Engine Light Operation:

PURPOSE
The check engine light is used to notify the vehicle operator that a fault has occurred in the PGM-FI electronic's. It also, is used to retrieve fault codes.

LOCATION
The check engine light is mounted in the instrument cluster.

CONSTRUCTION
Optional

OPERATION
Battery voltage is present at one bulb terminal any time the ignition is turned ON this signal comes from ignition switch terminal Ign. 1. When a system fault is detected, the ECU completes ground, causing the bulb to illuminate. The light is also grounded for two seconds after engine start up to verify the light is functional.