LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls And Fuel - 6.0L (L96) - DTC P0010 To DTC P0341) >> Diagnostic Information And Procedures >> DTC P0068 Or P1101: Throttle Body/Intake Air Flow Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool TB Idle Airflow Compensation parameter is less than 90%.
    • Go to next step: If less than 90% 
  3. Verify the scan tool TP Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep with a scan tool.
    • Go to next step: If Agree 
  4. Determine the current vehicle testing altitude.
  5. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure table.
    • The MAP Sensor pressure is not in range 

      Refer to DTC P0106  for further diagnosis.

    • Go to next step: The MAP Sensor pressure is within range 
  6. 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.

    • Go to next step: If between 26 - 52 kPa (3.8 - 7.5 PSI) and changes 
  7. 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.
    • The MAF Sensor parameter does not change smoothly and gradually 

      Refer to DTC P0101  for further diagnosis.

    • Go to next step: The MAF Sensor parameter changes smoothly and gradually 
  8. 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.
  9. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing below for further diagnosis.

    • Go to next step: If the DTC does not set 
  10. All OK
scientia non olet · About LEMON Manuals