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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 1.4L (LUJ, LUV) - DTC P0010 To P0246 >> Diagnostic Information and Procedures >> DTC P0068 or P1101: Throttle Body/Intake Air Flow >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify that DTC P0641, P0651, P0697 or P06A3 is not set.
    • If none of the DTCs are set 
  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 within range 
  8. Verify the engine is equipped with a turbocharger.
    • If not equipped with a turbocharger 

      Refer to Step  11.

    • If equipped with a turbocharger 
  9. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure table.
    • If the Boost Pressure Sensor parameter is not in range 

      Refer to DTC P0236  for further diagnosis.

    • If the Boost Pressure Sensor parameter is within range 
  10. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine.
    • If the Boost Pressure Sensor parameter does not decrease 

      Refer to DTC P0236  for further diagnosis.

    • If the Boost Pressure Sensor parameter is within range 
  11. 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 
  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 does not change smoothly and gradually 

      Refer to DTC P0101  for further diagnosis.

    • 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 does not set 
  15. All OK
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