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Home › Pontiac › 2009 › G3 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 1.6L (LXV) › Diagnostic Information and Procedures › DTC P0230 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the fuel pump relay.
  2. Verify a test lamp illuminates between the relay ground circuit terminal 85 and B+.
    • If the test lamp does illuminate, repair the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 86 and ground.
  4. Command the fuel pump relay ON with a scan tool. The test lamp should turn ON and OFF with each command.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If 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 circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the fuel pump relay.
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