Idle Learn Procedure - Buick 1993 Regal V6-231 3.8L VIN L SFI Service Manual

Idle Learn Procedure

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NOTE: The system has a learning ability which allows it to make corrections for minor variations in the fuel system to improve driveability. When the battery is disconnected the computer's memory is cleared and the learning process has to begin all over again. A change may be noticed in the driving performance of the vehicle. To reset the vehicles learning ability, make sure the engine is at operating temperature and operate the vehicle at part throttle, moderate acceleration, and idle conditions, until normal performance returns.

PROCEDURE
This procedure utilizes the capabilities of the Tech 1 scan tool. For the procedure to work properly, the vehicle transaxle must be in park or neutral.
1. Restore battery power.
2. Place transaxle in park or neutral.
3. Connect Tech 1 scan tool.
4. Select "IAC System," then select "Idle Learn" in the "Misc. Test" mode.
5. Proceed with idle learn as directed.

This procedure allows the ECM/PCM memory to be instantly updated with the correct IAC valve pintle position for the vehicle, and to provide a stable idle speed.