Check Engine Light

All 1991 models are equipped with a CHECK ENGINE light. Light comes on if component related to fuel injection and/or ignition system fails. The CHECK ENGINE light is installed in oil temperature/pressure gauge cluster. Light comes on as a self-test when ignition switch is in ON position.

After the engine starts, the throttle valve closes, and the CHECK ENGINE light goes out to indicate that no codes are present. If the CHECK ENGINE light remains on, a fault is present (hard failure) in the DME engine management system. If the CHECK ENGINE light comes on (flickers) while driving, a fault in the DME engine management system has been identified (intermittent failure).

If the idle speed switch is open during the starting sequence, the CHECK ENGINE light will come on. As soon as the idle speed switch closes while driving, the CHECK ENGINE light goes out after a 4-second delay.

If full throttle switch is faulty (shorted to ground), the CHECK ENGINE light will remain on constantly. Some fault codes CANNOT be displayed using the CHECK ENGINE light. In such cases, retrieve the fault code(s) through diagnostic connector, and repair condition(s) causing the CHECK ENGINE light to come on. See USING DIAGNOSTIC CONNECTOR under RETRIEVING CODES.