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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0716 or P0717 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, verify with a scan tool the transmission ISS/OSS supply voltage test status parameter displays OK.
    • If the parameter value displays Fault or Malfunction 

      Refer to Circuit/System Testing below.

    • If the parameter value displays OK 
  2. Engine idling in Park position, observe the scan tool transmission ISS parameter value while varying engine speed. The transmission ISS parameter should change with engine speed and not dropout.
    • If the parameter value does not vary with engine speed or drops out 

      Refer to Circuit/System Testing below.

    • If the parameter value does vary with engine speed and does not drop out 
  3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .
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