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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1761 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    If other DTCs are set, diagnose those DTCs first.

  1. Ignition ON, verify with a scan tool the Tap Up/Down Switch parameter displays ON in the Chassis Data list under BCM.
  2. Ignition ON, verify with a scan tool the Tap Up/Down parameter displays UP when pressing the plus (+) switch and Down when pressing the minus (-) switch.
  3. Ignition ON, verify with a scan tool the Driver Shift Control parameter in the Transmission Data list changes from, Inactive to Active when placing the automatic transmission shift lever in manual mode position.
  4. Ignition ON, verify with a scan tool the Driver Shift Request Switch 1 displays NONE in the transmission data list.
  5. Ignition ON, verify with a scan tool the Driver Shift Request Switch 1 displays Upshift when pressing the plus (+) switch and Downshift when pressing the minus (-) switch.
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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