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Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.6L (LGH) - DTC P0016 Through DTC P11DC >> Diagnostic Information and Procedures >> DTC P0234 >> Testing >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    Perform the Circuit /System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the air induction system and the turbocharger system by inspecting for the following conditions:
    • Any damaged components
    • Any loose or improperly installed components
    • A wet or restricted air filter
    • Any exhaust leaks before the turbocharger
    • Any exhaust restrictions after the turbocharger
    • Any snow or ice build-up in cold climates at the air cleaner and MAF sensor
    • Any water, snow, ice build-up, restrictions or coking at the MAP sensor
      • If a condition is found, clean or repair as necessary.
  2. Test the charge air cooler for leaks. Refer to Charge Air Cooler Diagnosis (Full System Air Leak Test) , Charge Air Cooler Diagnosis (Induction System Smoke Test) .
  3. Inspect the turbocharger oil supply tube for restrictions.
    • If a restriction is found, clean or replace the oil supply tube as necessary.
  4. Inspect the turbocharger and turbocharger ducts for debris, sticking vanes, worn impeller and turbine blades or damage. Refer to Turbocharger Cleaning and Inspection .
    • If worn or damaged turbocharger blades or vanes are found, replace the turbocharger assembly.
  5. If the induction system, charge air cooler system, the turbocharger and the turbocharger oil supply test normal, replace the B74 MAP sensor.
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