Emission Control Systems: Service and Repair

Engine Control Module (ECM) And Diagnostic Light Emitting Diode (LED) Locations:

ERASING DIAGNOSTIC TROUBLE CODES (DTC)'s
- Turn the ignition key on.
- Turn the diagnostic mode selector on the Engine Control Module (ECM) fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The Electronic Concentrated Engine Control System (ECCS) is now in mode 2.
- Turn the diagnostic mode selector on the ECM fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 1 and the ECM memory is now erased.