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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 P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135: Throttle Position Sensor >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON,
  2. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set.
    • If a DTC is not set 
  3. Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90%.
    • If less than 90% 
  4. Verify that DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, or P2135 are not set.
    • If DTC P0122, P0123, P0222, P0223, or P2135 are the only DTCs set 

      Replace the Q38 Throttle Body.

    • If DTC P16A0, P16A1, or P16A2 is set with any of the DTCs  

      Refer to Circuit/System Testing

    • If none of the DTCs are set 
  5. Verify the Throttle Position Sensors 1 and 2 parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
    • If Agree is not displayed 

      Test or replace the Q38 Throttle Body Assembly.

    • If Agree is displayed 
  6. Verify DTC P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 is not set.
    • If a DTC is set 

      Refer to Circuit/System Testing.

    • If a DTC is not set 
  7. Determine the current vehicle testing altitude.
  8. Verify the scan tool MAP Sensor pressure parameter is within range specified in the Altitude Versus Barometric Pressure (With LFX) table.
    • If the MAP Sensor pressure is not in range 

      Refer to DTC P0106 .

    • If the MAP Sensor pressure is within range 
  9. Engine idling.
  10. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input.
    • If not between 26-52 kPa (3.8-7.5 PSI) or does not change 

      Refer to DTC P0106 .

    • If between 26-52 kPa (3.8-7.5 PSI) and changes 
  11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below.
    1. Engine idling
    2. Perform the scan tool snapshot function.
    3. Increase the engine speed slowly to 3,000 RPM and then back to idle.
    4. Exit from the scan tool snapshot and review the data.
    5. Observe the MAF Sensor parameter frame by frame with a scan tool.
    • If the MAF Sensor parameter does not change smoothly and gradually 

      Refer to DTC P0101 .

    • If the MAF Sensor parameter changes smoothly and gradually 
  12. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 PSI) with engine at idle.
    • If the parameters are not within 3 kPa (0.4 PSI) 

      Refer to DTC P0236 .

    • If the parameters are within 3 kPa (0.4 PSI) 
  13. 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 the parameters are not within 20 kPa (2.9 PSI) 

      Refer to DTC P0236 

    • If the parameters are within 20 kPa (2.9 PSI) 
  14. 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.
  15. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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