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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1385 (Engine Controls And Fuel - 6.6L - DTC P1448 To DTC P2510) >> DTC P2146, P2149, P2152, or P2155 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  1. Turn OFF the ignition.
  2. Disconnect the ECM connector.
  3. Connect a test lamp between the fuel injector positive voltage control circuit and battery voltage. The test lamp should not illuminate.
    • If the test lamp illuminates, test the fuel injector positive voltage control circuit and both injector control circuits for a short to ground.
  4. Connect a test lamp between the affected fuel injector positive voltage control circuit and a ground. The test lamp should not illuminate.
    • If the test lamp illuminates, test the fuel injector positive voltage control circuit for a short to voltage.
  5. Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.
    • If the test lamp illuminates, test both fuel injector control circuits of the affected group for a short to ground.
  6. Test the affected fuel injector positive voltage control circuit and the fuel injector control circuit for high resistance.
  7. Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
    • If all circuits test normal, replace the ECM.
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