Idle Learn Procedure

With Scan Tool - Reset Procedure

1. Ignition ON, engine OFF, with a scan tool, perform the Idle Learn Reset in Module Setup.
2. Start the engine, monitor the Throttle Body Idle Airflow Compensation parameter. The Throttle Body Idle Airflow Compensation value should equal 0% and the engine should be idling at a normal idle speed.
3. Clear the DTCs with a scan tool.

Without Scan Tool - Learn Procedure

NOTE:

Do NOT perform this procedure if DTCs are set.

1. Start and idle the engine in park/neutral for 3 min.
2. With a scan tool, monitor the desired and the actual engine speed.
3. The ECM will start to learn the new idle cells and the desired engine speed should start to decrease.
4. Ignition OFF for 60 s.
5. Start and idle the engine in park/neutral for 3 min.
6. After the 3 min run time the engine should be idling normal.
   NOTE:
   • During the drive cycle the malfunction indicator lamp (MIL) may illuminate and idle speed DTCs set. If idle speed DTCs set, clear the DTCs so the ECM can continue to learn.
   • If the vehicle is driven for more than 10 km (6 mi) a Barometric Pressure (BARO) update is necessary so the ECM can continue to learn. To update the BARO, accelerate to wide open throttle (WOT) and then release the throttle.
   • If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 MPH) with several decelerations and extended idles.
7. After the drive cycle, the engine should be idling normally.
   • If the engine idle speed has not been learned, turn OFF the ignition for 60 s and repeat step 6.
8. Once the engine speed has returned to normal, clear the DTCs with a scan tool.