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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510 >> 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 positive voltage circuit for an open or a short to ground. If the circuits test normal, replace the control module.
  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. If the circuits test normal, replace the control module.
  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 illuminates test the relay control circuit for a short to ground. If the circuits test normal, replace the control module.
  4. With the ignition ON, probe the relay control circuit 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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