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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0201-P0208 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Observe the DTC information with a scan tool. If DTC P2146, P2149, P2152 or P2155 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

One Fuel Injector DTC Sets

  1. Disconnect the affected fuel injector connector.
  2. With ignition OFF, connect a test lamp between the affected fuel injector control circuit and a ground.
    • If the test lamp illuminates, test the injector control circuit for a short to voltage.
    • If the test lamp did not illuminate, test the affected fuel injector control circuit for an open.
  3. Test the affected fuel injector for high resistance. Refer to Component Testing .
    • If all circuits test normal, replace the ECM.

Two or More Fuel Injector DTCs Set

  1. Test the affected group injector positive voltage control circuit for an open.
  2. Test the affected fuel injector for high resistance. Refer to Component Testing .
    • If all circuits test normal, replace the ECM.
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