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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1046 (Engine Controls And Fuel - 6.6L - DTC P0016 To DTC P02E0) >> DTC P0299 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Perform the Repair Verification after completing the Circuit/System Testing.
  1. Verify the integrity of the air induction system, the turbocharger ducts and hoses 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
  2. Test the charge air cooler for leaks. Refer to Charge Air Cooler Diagnosis (Full System Air Leak Test) or Charge Air Cooler Diagnosis (Induction System Smoke Test) or Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) .
  3. Test the turbocharger oil supply feed. Refer to Turbocharger Lack of Oil Supply .
  4. Inspect the turbocharger oil supply tube for restrictions.
    • If a restriction is found, clean or replace the oil supply tube as necessary.
  5. Inspect the turbocharger for debris, 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.
  6. If the induction system, charger air cooler system, the turbocharger, and the turbocharger oil supply test normal, replace the MAP sensor.
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