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Home >> Buick >> 2017 >> Verano Base, Gas >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 2.4L (Lea) - DTC P0010 To DTC P0328 >> Diagnostic Information and Procedures >> DTC P0101: Mass Air Flow (MAF) Sensor Performance >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, verify that DTC P0641, P0651, P0697, or P06A3 is not set.
    • If none of the DTCs are set 
  2. If you were sent here from DTC P0068, P0106, P0121, or P1101; refer to Circuit/System Testing.
  3. Ignition ON.
  4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
    • If less than 90% 
  5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
    • If Agree 
  6. Determine the current vehicle testing altitude.
  7. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure table.
    • If the MAP Sensor parameter is not in range 

      Refer to DTC P0106  for further diagnosis.

    • If the MAP Sensor parameter is in range 
  8. Engine idling, 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  for further diagnosis.

    • If between 26 - 52 kPa (3.8 - 7.5 PSI) and changes 
  9. 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 Circuit/System Testing.

    • If the MAF Sensor parameter does change smoothly and gradually 
  10. 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.
  11. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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