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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P2002 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 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 entire exhaust system by visually inspecting for the following conditions:
    • Any damaged components
    • Improper installation. The exhaust differential pressure lines should have a continuous downward gradient, without bends or kinks, from the differential pressure sensor to the particulate filter.
    • Improperly routed exhaust differential pressure sensor lines. The smaller line connects to the front of the exhaust particulate filter.
  2. Remove the exhaust differential pressure sensor lines. Visually inspect the lines for restrictions.
    • If a condition is found, replace the exhaust differential pressure lines.
  3. Verify the integrity of the entire air induction system by inspecting for the following conditions:
    • Restrictions in the air induction system and the turbocharger system
    • Leaks in the intake air ducts and the turbocharger ducts
    • Cracked or damaged MAF sensor housing
    • Inspect for a dirty air filter element
    • Debris blocking the air sensing filaments of the MAF sensor
    • If a condition is found, repair as necessary.
  4. Test the charge air cooler system for leaks. Refer to Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) or Charge Air Cooler Diagnosis (Full System Air Leak Test) .
    • If a charge air cooler leak is found, repair as necessary.
  5. Test the engine for gaskets leaks.
    • If an engine gasket leak is found, repair as necessary.
  6. If the air intake system, exhaust system, DPF components, and the charge air cooler test normal, replace the particulate filter.
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