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Home >> Saturn >> 2007 >> Outlook XR, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - Troubleshooting >> Fuel Pump Electrical Circuit Diagnosis >> Circuit/System Testing
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Circuit/System Testing

  1. With the ignition OFF, remove the fuel pump relay from the rear electrical center.
  2. With the ignition ON, engine OFF, probe the control circuit of the fuel pump relay with a test lamp that is connected to a good ground. Command the fuel pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
    • If the test lamp does not turn ON and OFF, test for an open or a short to ground in the fuel pump relay control circuit or an intermittent or a poor connection at the engine control module (ECM). If the circuit tests normal, replace the control module.
    • If the test lamp remains illuminated with each command, test for a short to voltage in the control circuit of the fuel pump relay or an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the control module.
  3. Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the fuel pump relay. Command the fuel pump relay ON and OFF with a scan tool.
    • If the test lamp does not turn ON and OFF, repair the open or the high resistance in the ground circuit of the fuel pump relay.
    • If the test lamp does turn ON and OFF, test for an intermittent and for a poor connection at the fuel pump relay or a faulty fuel pump relay.
  4. Inspect the fuel pump fuse.
    • If the fuel pump fuse is open, test for a short to ground in the supply voltage circuit of the fuel pump or a faulty fuel sender.
  5. With the ignition ON, engine OFF, probe the battery positive voltage circuit of the fuel pump relay with a test lamp that is connected to a good ground.
    • If the test lamp does not illuminate, repair the open in the battery positive voltage circuit.
  6. Connect a 15-amp fused jumper wire between the battery positive voltage circuit of the fuel pump relay and the supply voltage circuit of the fuel pump.
    • If the fuel pump operates, test for an intermittent or poor connection at the fuel pump relay or a faulty fuel pump relay.
    • If the fuel pump does not operate, test for an open or high resistance in the supply voltage circuit of the fuel pump, an open or high resistance in the ground circuit of the fuel pump, an intermittent or poor connection at the fuel sender cover or a faulty fuel sender.
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