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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P2510 >> Circuit/System Testing

Circuit/System Testing

  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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