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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Testing

Circuit/System Testing

Fuel Pressure Low

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
    • If a condition exists 

      Repair as necessary.

    • If no conditions exist 

      Replace the G12 Fuel Pump.

Fuel Pressure Leaks Down

  1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief .
  2. Install the EN37287  Adapter between the chassis fuel feed hose and the high pressure fuel pump.
  3. Open the valve on the EN37287  Adapter.
  4. Ignition ON, command the Fuel Pump Enable On and then Off with a scan tool.
  5. Close the valve on the EN37287  Adapter.
  6. Verify that the Fuel Pressure Sensor parameter does not decrease greater than 34 kPa (5 psi) in 1 minute.
    • If greater than 34 kPa (5 psi) 

      Replace the G12 Fuel Pump.

    • If less than 34 kPa (5 psi) 

      Locate and replace the leaking Q17 Fuel Injector.

Fuel Pressure Drops Off

  1. Verify none of the conditions listed below exist:
    • Restricted fuel feed pipe
    • Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
    • If a condition exists 

      Repair as necessary.

    • If no conditions exist 

      Replace the G12 Fuel Pump.

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