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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 278 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0117 (LGX) To DTC P0697) >> Diagnostic Information and Procedures >> DTC P0627-P0629: Fuel Pump Speed (LGX) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify that DTC P0627, P0628, or P0629 are not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing.

    • If none of the DTCs are set 
  3. Verify the parameters listed below do not display Malfunction when commanding the Fuel Pump Speed Increase and Decrease with a scan tool.
    • Fuel Pump Speed Output Circuit Low Voltage Test Status
    • Fuel Pump Speed Output Circuit Open Test Status
    • Fuel Pump Speed Output Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing.

    • If Malfunction is not displayed 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify DTC P0627, P0628, or P0629 are not set.
    • If a DTC sets 

      Refer to Circuit/System Testing.

    • If a DTC does not set 
  6. All OK.
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