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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 3.6L (LF4 LGX) - DTC P0121 LF4 To DTC P0685 LF4) >> Diagnostic Information and Procedures >> DTC P0191: Fuel Rail Pressure Sensor >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set.
    • If none of the DTCs are set 
  3. Verify that DTC P0182, P0183, P0192, P0193, P0187, P0188, P111F, P126E, P126F, P128A, P128B, P128C, P128D, P128F, P16E4, or P16E5 is not set.
    • If DTC P0191 is the only DTC set 

      Test or replace the B47B Fuel Rail Pressure Sensor.

    • If DTC P0191 is set with any of the DTCs 

      Refer to Circuit/System Testing.

    • If none of the DTCs are set 
  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 the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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