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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1344 (Engine Controls And Fuel - Hybrid (Hp2) 6.0L (LFA) - 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 and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  1. Start and idle the engine for 3 minutes.
  2. With a scan tool, monitor the Desired Idle Speed and the actual Engine Speed.
  3. The ECM will start to learn the new idle cells and Desired Idle Speed should start to decrease.
  4. Ignition OFF for 60 seconds.
  5. Start and idle the engine for 3 minutes.
  6. After the 3 minute run time the engine should be idling normal.
      NOTE: 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.
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