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Home >> Buick >> 2008 >> Allure CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0335 To DTC P2097 >> DTC P0627, P0628, or P0629 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool DTC information. Verify DTC P2105 is not set.
    • If DTC P2105 is set, refer to refer to DTC P2105 for further diagnosis.
  2. Command the Fuel Pump Relay ON and OFF with a scan tool. You should hear an audible click.
  3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
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