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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 443 (ENGINE CONTROLS AND FUEL - 4.6L - INTRODUCTION)REPAIR INSTRUCTIONSTHROTTLE LEARNTHROTTLE LEARN
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Throttle Learn

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Throttle Learn
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

With Scan Tool - Reset

  1. Ignition ON, engine OFF. With a scan tool, perform the Idle Learn Reset in Module Setup.
  2. Start the engine, monitor the TB Idle Airflow Compensation parameter. The TB Idle Airflow Compensation parameter value should equal 0 percent and the engine should be idling at a normal idle speed.
    • If the engine is not idling normally, proceed with the Learn portion of the diagnostic.
  3. Clear the DTCs and return to the diagnostic that referred you here.
IMPORTANT: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Without Scan Tool-Learn

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.
  2. The engine speed is between 450-4,000 RPM.
  3. The manifold absolute pressure (MAP) is greater than 5 kPa.
  4. The mass air flow (MAF) is greater than 2 g/s.
  5. The ignition 1 voltage is greater than 10 volts.
  6. Start and idle the engine in PARK for 3 minutes.
  7. With a scan tool, monitor desired and actual RPM.
  8. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
  9. Ignition OFF for 60 seconds.
  10. Start and idle the engine in PARK for 3 minutes.
  11. 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.
  12. 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.
  13. Once the engine speed has returned to normal, clear DTCs.
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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.