LEMON Manuals: Even more car manuals for everyone
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 P0722 or P0723 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  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.

    • If the parameter value displays OK 
  2. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the transmission OSS parameter on the scan tool. The transmission OSS parameter value should vary with vehicle speed and not drop out.
    • If the parameter value does not vary with vehicle speed or drops out 

      Refer to Circuit/System Testing below.

    • If the parameter value does vary with vehicle 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 .
scientia non olet · About LEMON Manuals