PCM Reset

After a PCM reset procedure has been performed, the following conditions will be met:

All DTCs will be cleared from PCM memory.
All freeze frame data will be cleared from PCM memory.
Diagnostic monitoring results will be cleared from PCM memory.
OBD-II system monitor status will reset.
DTC P1000 will be set in PCM memory until all OBD-II system monitors or components have been tested to satisfy OBD-II drive cycle without any faults occurring. To clear DTC P1000, perform OBD-II DRIVE CYCLE. See appropriate DRIVE CYCLES under ADDITIONAL SYSTEM FUNCTIONS.

To perform PCM reset using scan tool, follow scan tool manufacturer's operating instructions. If after clearing DTCs a problem has not been corrected or fault is still present, hard code will immediately be reset in PCM memory.

CAUTION: When battery is disconnected, vehicle computer may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting the battery.