Emission Control Systems: Service and Repair

CHECK ENGINE LIGHT RESET:

1. Turn the ignition key on.
2. Turn the diagnostic mode selector on the ECU fully clockwise until both diodes flash 4 times then turn the selector fully counterclockwise. The ECCS system is now in mode 4.
3. Turn the ignition key off. This will return the ECCS system to mode #1 (normal operating mode).
ECU memory is now erased.