Keep Alive Random Access Memory Reset Procedure
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 Random Access Memory (RAM) will return PCM memory to its default setting. Adaptive learning contents such as idle and fuel trim are included. PCM reset procedure is part of keep alive RAM reset. See PCM RESET PROCEDURE . If an error message is received or scan tool is unable to perform keep alive RAM reset procedure, disconnect negative battery terminal for a minimum for 5 minutes, then go to next step. If using Worldwide Diagnostic System (WDS) or New Generation Star (NGS) scan tool, turn ignition switch to ON position. Select ACTIVE COMMAND MODES, then select RESET KEEP ALIVE MEMORY. Go to next step.
- After keep alive RAM 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. See IDLE AIR TRIM LEARNING MODES table.IDLE AIR TRIM LEARNING MODES
Transmission Gear Selector Position A/C Mode Neutral On Neutral Off Drive On Drive Off