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Home >> Saturn >> 2007 >> Relay 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0010 To DTC P0420 >> DTC P0230 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the affected fuel pump relay.
  2. Test for less than 5 ohms of resistance between the ground circuit and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the fuel pump relay.
  4. Command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the engine control module (ECM).
    • If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the fuel pump relay.
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