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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 2.4L - DTC P0628 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2635: Fuel Pump Flow (Fuel Pump Power Control Module) >> Repair Verification

Repair Verification

WARNING: This page is about a different variant/trim than selected.
  1. Install any components that have been removed or replaced during diagnosis.
  2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
  3. Clear the DTCs with a scan tool.
  4. Turn OFF the ignition for 60s.
  5. Operate the vehicle within the Conditions for Running the DTC.
  6. Verify the scan tool Short Term Fuel Pump Trim and the Long Term Fuel Pump Trim when multiplied together are less than 1.5.
    • If greater than 1.5 

      Refer to Circuit/System Testing.

    • If less than 1.5 
  7. Command the Fuel Pressure to 300 kPa (43.5 psi) using the scan tool Control Function: Fuel Pressure Increase/Decrease.
  8. Verify the scan tool parameter: Fuel Pressure Sensor & Desired Fuel Pressure are within 45 kPa (6.5 psi) of each other at 300 kPa (43.5 psi) request.
    • If greater than 45 kPa (6.5 psi) 

      Refer to Circuit/System Testing.

    • If less than 45 kPa (6.5 psi) 
  9. Command the Fuel Pressure to 400 kPa (58 psi) using the scan tool Control Function: Fuel Pressure Increase/Decrease.
  10. Verify the scan tool parameter: Fuel Pressure Sensor & Desired Fuel Pressure are within 60 kPa (8.7 psi) of each other at 400 kPa (58 psi) request.
    • If greater than 60 kPa (8.7 psi) 

      Refer to Circuit/System Testing.

    • If less than 60 kPa (8.7 psi) 
  11. All OK.
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