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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1311 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L, 6.2L - Introduction (1 Of 2)) >> Repair Instructions >> Throttle/Idle Learn >> Throttle Learn >> Learn Procedure (Performed after the ECM is flashed or replaced)

Learn Procedure (Performed after the ECM is flashed or replaced)

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Do NOT perform this procedure if DTCs are set. Refer to appropriate DTC.
  1. Start and idle the engine in PARK for 3 minutes.
  2. With a scan tool, monitor desired and actual RPM.
  3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
  4. Ignition OFF for 60 seconds.
  5. Start and idle the engine in PARK for 3 minutes.
  6. After the 3 minute run time the engine should be idling normal.
      IMPORTANT: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
    • 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 seconds and repeat step 6.
  8. Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here.
  1. Ignition ON, engine OFF, perform the Idle Learn Reset in Module Setup with a scan tool.
  2. Start the engine and monitor the TB Idle Airflow Compensation parameter. The TB Idle Airflow Compensation value should equal 0 percent and the engine should be idling at a normal idle speed.
  3. Clear the DTCs and return to the diagnostic that referred you here.
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