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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0013 To DTC P0315 >> DTC P025A >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the FPCM.
  2. Ignition OFF, connect a test lamp between the control circuit terminal 13 and ground.
  3. Ignition ON, command the fuel pump ON and OFF with a scan tool ECM fuel pump output control. The test lamp should turn ON and OFF when changing between the command states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • 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 ECM.
  4. If all circuits test normal, replace the FPCM.
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