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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 278 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0117 (LGX) To DTC P0697) >> Diagnostic Information and Procedures >> DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135: Throttle Position Sensor/ Sensor Communication (LF4) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. If you were sent here from DTC P0068, P0101, P010B, P0106, P0236, or P1101, refer to Circuit/System Testing.
  2. Ignition ON.
  3. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set.
    • If none of the DTCs are 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 Assembly.

    • 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 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 both of the scan tool Barometric Pressure Sensor Bank 1 and Bank 2 parameters are within the range specified in the Altitude Versus Barometric Pressure table.
    • If the parameters are within the specified range 
  10. Verify the following scan tool parameters are within 3 kPa (0.4 PSI) of each other.
    • Barometric Pressure Sensor Bank 1
    • Barometric Pressure Sensor Bank 2
    • Boost Pressure Sensor
    • If within 3 kPa (0.4 PSI) 
  11. Engine idling.
  12. 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 (LF4) .

    • If between 26-52 kPa (3.8-7.5 psi) and changes 
  13. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 PSI), during a wide open throttle (WOT) acceleration at the time of the 1-2 shift.
    • If not within 20 kPa (2.9 PSI) of each other 

      Refer to the corresponding DTC P0106 (LF4) , or DTC P0236  for further diagnosis.

    • If within 20 kPa (2.9 psi) 
  14. Verify the scan tool MAF Sensor Bank 1 and Bank 2 g/s parameters change 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 Bank 1 and Bank 2 parameters frame by frame with a scan tool.
    • If one or both of the parameters do not change smoothly and gradually 

      Refer to DTC P0101 (LF4) , or DTC P010B as appropriate.

    • If both parameters change smoothly and gradually 
  15. 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.
  16. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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