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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333 >> Diagnostic Information and Procedures >> DTC P0237 or P0238: Turbocharger Boost Sensor >> Circuit/System Verification

Circuit/System Verification

  1. Verify that DTC P0641 is not set.
    • If the DTC is not set 
  2. Verify the scan tool BARO parameter is within the range specified in the Altitude Versus Barometric Pressure (With LFX) table, for the current vehicle testing altitude.
    • BARO is within range 
  3. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 PSI) .
    • The parameters are not within 3 kPa (0.4 PSI). 

      Refer to Circuit/System Testing

    • The parameters are within 3 kPa (0.4 PSI). 
  4. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 PSI) during a WOT acceleration at the time of the 1-2 shift.
    • The parameters are not within 20 kPa (2.9 PSI) 

      Refer to Circuit/System Testing.

    • The parameters are within 20 kPa (2.9 PSI) 
  5. 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.
  6. Verify a DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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