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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0010 - P034B)) >> Diagnostic Information And Procedures >> DTC P0101: Mass Air Flow (MAF) Sensor Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition On.
  2. Verify that DTC P0102, P0103, P0641, P0651, P0697, P06A3 or P06D2 is not set.
    • Go to next step: If none of the DTCs are set 
  3. If you were sent here from DTC P0068, P0106, P0121, P0236, or P1101; refer to Circuit/System Testing.
  4. Ignition On, verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
    • Go to next step: 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.
    • Go to next step: 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 not within the specified range 

      Refer to DTC P0106  for further diagnosis.

    • Go to next step: If within the specified range 
  8. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure table.
    • If not within the specified range 

      Refer to DTC P0236 .

    • Go to next step: If within the specified range 
  9. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine.
    • If the parameter does not decrease 

      Refer to DTC P0236  for further diagnosis.

    • Go to next step: If the parameter does decrease 
  10. 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 within the specified range or does not change 

      Refer to DTC P0106 .

    • Go to next step: If within the specified range 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 parameter does not change smoothly and gradually 

      Refer to Circuit/System Testing.

    • Go to next step: If the parameter changes smoothly and gradually 
  12. 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.
  13. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If the DTC does not set 
  14. All OK
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