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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 P0989 or P0990 >> Circuit/System Testing

Circuit/System Testing

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    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF. Remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
  3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
  4. Connect the DT-47825-10  jumper harnessbetween the vehicle wire harness electrical connector, and the Q8 control solenoid valve assembly electrical connector.
  5. Ignition ON, verify with a scan tool that each TFP switch parameter changes states when gently pushing on each TFP switch with the eraser end of a pencil.
    • If any TFP switch parameter does not change states, replace the Q8 control solenoid valve assembly.
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