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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 P0234 or P0299: Engine Boost >> Circuit/System Verification

Circuit/System Verification

  1. Ignition On.
  2. Verify DTC P0106, P0107, P0108, P0236, P0237, P0238, P0243, P0245, P0246, P2227, P2228, P2229, or P2230 is not set.
    • If none of the DTCs are set 
  3. Verify the scan tool BARO Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure (With LFX) table for the current testing altitude.
    • If within the range. 
  4. Verify the scan tool MAP Sensor and BARO Sensor parameters are within 3 kPa (0.4 PSI) .
    • If not within 3 kPa (0.4 PSI). 

      Refer to DTC P0106 .

    • If within 3 kPa (0.4 PSI). 
  5. Verify the scan tool Boost Pressure Sensor and BARO Sensor parameters are within 3 kPa (0.4 PSI) .
    • If not within 3 kPa (0.4 PSI). 

      Refer to DTC P0236 .

    • If within 3 kPa (0.4 PSI). 
  6. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
    • If a click is heard or felt 
  7. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
    • Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
    • Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status
    • Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status
    • If Malfunction is not displayed 
  8. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15-100% with a scan tool.
    • If a series of clicks in increasing frequency is heard or felt 
  9. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15-100% with a scan tool.
    • Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status
    • Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status
    • Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status
    • If Malfunction is not displayed 
  10. 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.
    • If not within 20 kPa (2.9 PSI) 

      Refer to Circuit/System Testing.

    • If within 20 kPa (2.9 PSI) 
  11. 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.
  12. Verify a DTC does not set.
    • If a DTC sets 

      Refer to Circuit/System Testing

    • If a DTC does not set 
  13. All OK
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