Check Engine/Malfunction Indicator Lamp

MALFUNCTION INDICATOR LAMP




Among the self-diagnostic items, a malfunction indicator light comes on to notify the driver of emission control items that are malfunctioning. However, when a signal returns to normal and the ECU senses that it has returned to normal, the malfunction indicator light goes out.

Immediately after the ignition switch is turned on, the malfunction indicator light is lit for 5 seconds to indicate it is operating normally. The MIL will come ON only while the engine is running and a problem is detected.

Items Indicated By The MIL (Malfunction Indicator Light)

- Computer
- Oxygen sensor
- Air-flow sensor
- Intake air temperature sensor Throttle position sensor
- Motor position sensor
- Engine coolant temperature sensor
- Crank angle sensor
- No.1 cylinder top dead center sensor
- Barometric pressure sensor
- Injector
- Fuel pump
- EGR temperature sensor (California Vehicles Only)

**TSB # 9113003, DATED FEBRUARY 1991
There are two different wiring harnesses used on this vehicle. A poor connection at a crimp may be causing the check engine light to come on. Refer to the TSB for further information.