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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 512 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0358) >> Diagnostic Information and Procedures >> DTC P0120-P0123, P0220, P0222, P0223, or P2135 >> Circuit/System Verification

Circuit/System Verification

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  1. If you were sent here from DTC P0068, P0101, P0106, or P1101 refer to Circuit/System Testing.
  2. Ignition ON.
  3. Verify that DTC P0641 or P0651 is not set.
    • If none of the DTCs are set 
  4. Verify the scan tool TB Idle Airflow Compensation parameter is less than 90 %.
    • If less than 90 % 
  5. Verify the scan tool TP Sensor 1 and TP Sensor 2 voltage parameters are between 1.0-4.0 V and change with accelerator pedal input.
    • If not between 1.0-4.0 V or does not change 

      Refer to Circuit/System Testing

    • If between 1.0-4.0 V and changes 
    6. NOTE:

    If the Throttle Sweep Test is not available on the scan tool, use the accelerator to perform the test. Refer to Diagnostic Aids for further details.

  6. Verify the scan tool TP Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
    • If Disagree 

      Refer to Circuit/System Testing

    • If Agree 
  7. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
  8. Ignition ON.
  9. Verify that DTC P0120 or P0220 are not the only TP sensor DTCs set.
    • If DTC P0120 or P0220 are the only DTCs set 

      Replace the engine control module

    • If DTC P0120 or P0220 are not set 
  10. Verify DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223, and P2135 is not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing

    • If none of the DTCs are set 
  11. Determine the current vehicle testing altitude.
  12. Verify the scan tool MAP Sensor pressure parameter is within range specified in the Altitude Versus Barometric Pressure table.
    • The MAP Sensor pressure is not in range 

      Refer to DTC P0106 .

    • The MAP Sensor pressure is within range 
  13. Engine idling.
  14. 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 .

    • If between 26-52 kPa (3.8-7.5 psi) and changes 
  15. 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 .

    • The MAF Sensor parameter changes smoothly and gradually 
  16. 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.
  17. Verify a DTC does not set.
    • If no DTCs set 
  18. All OK
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