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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 P2510 >> Circuit/System Testing

Circuit/System Testing

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  1. Observe the DTCs with a scan tool.
    • If DTC P2610 is also set, test the battery voltage circuit for an open, a short to ground, or a faulty ECM.
  2. With the ignition ON, disconnect the ECM 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 or a faulty ECM.
  3. With the ignition OFF, probe the relay control circuit at the underhood electrical center with a test lamp connected to battery voltage.
    • If the test lamp does not illuminate replace the ECM relay.
    • If the test lamp illuminates test the relay control circuit for a short to ground or a faulty ECM.
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