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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0385 To DTC P2108 >> DTC P0411 >> Circuit/System Verification
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Circuit/System Verification

  1. If any other AIR DTCs are set, perform those diagnostics first.
  2. Inspect the AIR solenoid outlet pipe for leaks.
  3. Engine running, observe that the AIR Pressure Sensor parameter approximately equals barometric pressure (BARO).
  4. Engine running, enable the AIR pump with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 15-22 kPa above BARO.
  5. Engine running, enable the AIR solenoid with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.
  6. 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.
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