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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 508 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0420 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0506 or P0507 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON.
  2. Verify there are no other DTCs set.
    • If no other DTCs are set 
  3. Verify the scan tool TB Idle Airflow Compensation parameter is less than 90 %.
    • If less than 90 % 
  4. Engine Idling at the normal operating temperature.
    5. NOTE:

    The engine must run for greater than 60 s, then idle at a steady state for an additional 10 s before comparing the actual and desired engine speed parameters.

  5. Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
    • If 100 RPM less than the Desired Idle Speed 

      Refer to Circuit/System Testing

    • If 100 RPM greater than the Desired Idle Speed 
  6. Verify the actual Engine Speed is not 200 RPM greater than the Desired Idle Speed.
    • If 200 RPM greater than the Desired Idle Speed 

      Refer to Circuit/System Testing

    • If 200 RPM less than the Desired Idle Speed 
  7. 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.
  8. Verify a DTC does not set.
    • If no DTCs set 
  9. All OK
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