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 «DRIVE CYCLES»(ref-91102-S24383971062001030200000) 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. |
Resetting Keep-Alive Memory (KAM)
- Resetting KAM will return PCM memory to its default setting. If not using a scan tool, disconnect negative battery terminal for a minimum for 5 minutes then go to next step. If using New Generation Star (NGS) scan tool, turn ignition on. Select ACTIVE COMMAND MODES, then RESET KEEP ALIVE MEMORY. Go to next step.
- After KAM has been reset, engine must idle for 15 minutes to learn new idle air trim values. Idle quality will improve as strategy adapts. Adaptation occurs in 4 separate modes with engine idling, transmission selector and A/C in specified position. See «IDLE AIR TRIM LEARNING MODES»(ref-91102-S29504596562001030200000) table. IDLE AIR TRIM LEARNING MODES Transmission Gear Selector Position A/C Mode Neutral On Neutral Off Drive On Drive Off