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

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. If you were sent here from DTC P0068, P0101, P0106, or P1101 refer to Circuit/System Testing.
  2. Ignition ON,
  3. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set.
    • If a DTC is not set 
  4. Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90%.
    • If less than 90% 
  5. 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 

      Test or 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 
  6. Verify the Throttle Position Sensors 1 and 2 Agree/Disagree 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 
  7. Verify DTC P0121, 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 
  8. Determine the current vehicle testing altitude.
  9. Verify the scan tool MAP Sensor pressure parameter is within range specified in the Altitude Versus Barometric Pressure table.
    • If the pressure is not in range 

      Refer to DTC P0106 .

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

      Refer to DTC P0106 .

    • If between 26-52kPa (3.8-7.5 psi) and changes 
  12. 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 changes smoothly and gradually 
  13. 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.
  14. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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