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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 369 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0010 Through DTC P0442) >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the G12 fuel pump.
  2. Connect a test lamp between the control circuit terminal D and ground.
  3. Ignition ON, command the G12 fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF, as commanded.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump control module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
  4. Ignition OFF, connect a test lamp between the control circuit terminal D and the low reference circuit terminal A.
  5. Ignition ON, command the G12 fuel pump ON with a scan tool. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the low reference circuit terminal A for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
  6. If all circuits test normal, replace the fuel tank G12 fuel pump module.
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