Emission Control Systems: Service and Repair

NOTE: If the "CHECK ENGINE" light is on, there is a fault in the computer system. Refer to Computers and Control Systems for testing and inspection procedures.

ECM And A/T Control Unit Location:

ERASING DIAGNOSTIC CODES
1. Turn the ignition key on.
2. Turn the diagnostic mode selector on the ECM 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).
ECM memory is now erased.