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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P0191: Fuel Rail Pressure Sensor >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Observe the scan tool DTC information, verify DTC P0627, P0628, P0629, P0641, P069E or U0109 is not set.
  2. Engine idling, observe the scan tool Fuel Rail Pressure Sensor parameter. The pressure should be approximately 2.96-3.24MPa (429-470 psi).
  3. Engine idling, the scan tool Fuel Rail Pressure Sensor should be close to the scan tool Desired Fuel Rail Pressure. As the engine speed increases, the Desired Fuel Rail Pressure and the Fuel Rail Pressure Sensor should closely match each other.
  4. Move related harnesses/connectors of the B47B fuel rail fuel pressure sensor and verify the engine does not stumble, stall, or change engine speed.
    • If the engine stumbles, stalls, or changes engine speed, test or repair the suspected harness or connection.
  5. Observe the DTC information with a scan tool, DTC P0191 should not set.
  6. 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 you observed from the Freeze Frame/Failure Records data.
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