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Home >> Pontiac >> 2010 >> Solstice Base, 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls And Fuel - 2.0L - Troubleshooting And Diagnosis) >> Fuel System Diagnosis (Saturn) >> Circuit/System Testing

Circuit/System Testing

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    NOTE:
    • The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
    • DO NOT start the engine.
  1. Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool and observe the fuel pressure gauge while the fuel pump is operating. Verify the fuel pressure is between 395-464 kPa (57-67 psi).
    • If the fuel pressure is greater than the specified range, replace the fuel pump module.
    • If the fuel pressure is less than the specified range, test, inspect, and repair the items listed below. If all items test normal, replace the fuel pump module.
      • Restricted fuel feed pipe
      • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
  2. Verify that the fuel pressure does not decrease greater than 34 kPa (5 psi) in 5 minutes.
    • If the fuel pressure decreases greater than the specified value, perform the following procedure:
      1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief (Low Pressure without Special Tool) or Fuel Pressure Relief (Low Pressure with CH 48027) or Fuel Pressure Relief (Low Pressure Side with CH 48027-100) or Fuel Pressure Relief (High Pressure Side) .
      2. Disconnect the chassis fuel feed hose from the engine compartment fuel pipe. Refer to Metal Collar Quick Connect Fitting Service .
      3. Connect the chassis fuel feed hose to the inlet side of SA9127E-7:  Fuel Pressure/Flow Adapter using the J 43937:  Adapter Lines.
      4. Connect the engine compartment fuel pipe to the ON/OFF valve side of the SA9127E-7:  Fuel Pressure/Flow Adapter using the J 43937:  Adapter Lines.
      5. Cap the pressure test port on the SA9127E-7:  Fuel Pressure/Flow Adapter with the J 43936:  Fuel Pressure Adapter Cap.
      6. Open the valve on the SA9127E-7:  Fuel Pressure/Flow Adapter.
      7. Ignition ON, command the fuel pump relay ON with a scan tool and bleed the air from the CH 48027-100:  Gauge.
      8. Command the fuel pump relay ON with a scan tool.
      9. Close the valve on the SA9127E-7:  Fuel Pressure/Flow Adapter.
      10. Monitor the fuel pressure for 1 minute.
        • If the fuel pressure does not decrease greater than 34 kPa (5 psi) within the specified time, replace the fuel pump module.
  3. Relieve the fuel pressure to 69 kPa (10 psi). Verify that the fuel pressure does not decrease greater than 14 kPa (2 psi) in 5 minutes.
    • If the fuel pressure decreases greater than the specified value, replace the fuel pump module.
  4. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH 48027-100:  Gauge. The fuel pressure should not drop off during acceleration, cruise, or hard cornering.
    • If the fuel pressure drops off, test, inspect, and repair the items listed below. If all items test normal, replace the fuel pump module.
      • Restricted fuel feed pipe
      • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
  5. If the fuel system tests normal, refer to Symptoms - Engine Controls , Fuel Injector Solenoid Coil Test , and Fuel Injector Balance Test .
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