Clearing Codes
WARNING: This page is about a different car, the 1994 Mazda Navajo. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Disconnecting vehicle battery will erase stored operating information from Keep-Alive Memory (KAM). If battery is disconnected, refer to COMPUTER RELEARN PROCEDURES.
To clear codes from PCM memory, start KOEO SELF-TEST. When service codes appear on test equipment or CHECK ENGINE light, disconnect jumper wire from Self-Test Input (STI) connector. If using Star Series Tester, unlatch center button. This procedure erases Continuous Memory Codes from PCM memory. If problem has not been corrected or fault is still present, hard code will immediately be reset in PCM memory.
NOTE:
To clear KAM, disconnect negative battery terminal for at least 5 minutes.