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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1984 (ENGINE CONTROLS AND FUEL - 3.5L - INTRODUCTION)REPAIR INSTRUCTIONSTHROTTLE/IDLE LEARNTHROTTLE LEARN
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Throttle Learn

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Throttle Learn
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Reset Procedure (Performed after the throttle body is cleaned or replaced)

  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.

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

    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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.