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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P2146, P2149, P2152, or P2155 >> Circuit/System Testing

Circuit/System Testing

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Fuel Injector Group DTC set

  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.
    • If the test lamp illuminates, test the fuel injector positive voltage circuit for a short to ground.
  4. Test the fuel injector positive voltage control circuit and the fuel injector control circuit for high resistance.
  5. Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
    • If all circuits test normal, replace the ECM.

Fuel Injector Group DTC and Fuel Injector DTCs set

  1. Turn OFF the ignition.
  2. Disconnect the ECM connector.
  3. Connect a test lamp between the fuel injector positive voltage control circuit and a ground.
    • If the test lamp illuminates, test the fuel injector positive voltage control circuit for a short to voltage.
  4. Connect a test lamp between the affected fuel injector control circuit and battery voltage.
    • If the test lamp illuminates, test both fuel injector control circuits of the affected group for a short to ground.
  5. 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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