Clearing Diagnostic Trouble Codes

Switching Diagnostics Modes:

1. Turn the ignition key on.
2. Turn the diagnostic mode selector on the Engine Control Module (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.