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Home › Hummer › 2009 › H2 4D Utility Pickup › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 6.2L - DTC P0300 To DTC P0700 › DTC P0650 › Circuit/System Testing

Circuit/System Testing

  1. If any other instrument panel cluster (IPC) indicators or gages are inoperative, refer to Symptoms - Displays and Gages .
  2. Ignition OFF, disconnect ECM X1 harness connector. Ignition ON, the MIL should not illuminate.
    • If the MIL is illuminated, test the MIL control circuit terminal X1-12 for a short to ground. If the circuit tests normal, replace the IPC.
  3. Ignition ON, connect a 3A fused jumper wire between the MIL control circuit terminal X1-12 and ground. The MIL should illuminate.
    • If the MIL does not illuminate, test the MIL control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the IPC/bulb.
  4. If all circuits/connections test normal, replace the ECM.
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