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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 P2510 >> 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: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. With the ignition ON, disconnect the PWR/TRN relay and observe with the scan tool for loss of communication.
    • If the scan tool can still communicate with the vehicle, test the IGN 1 voltage circuit supplied by the ECM relay for a short to voltage. If the circuits test normal, replace the ECM.
  2. With the ignition OFF, probe the relay control circuit 19 X2 at the underhood electrical center with a test lamp connected to battery voltage.
    • If the test lamp illuminates test the relay control circuit for a short to ground. If the circuits test normal, replace the ECM.
  3. With the ignition ON, probe the relay control circuit 19 X2 at the underhood electrical center with a test lamp connected to a good ground.
    • If the test lamp illuminates, repair the short to voltage.
    • If the test lamp does not illuminate, replace the relay.
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