GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 25025-5 Dial Indicator Mounting Post-M6 x 1.00


    Object Number: 1552971  Size: SH

    Important: Secondary fluid pump connector (1) is used for M33 models only, connector (2) is used on ISS models.

  1. Inspect the wiring harness and solenoid assembly for the following conditions:
  2. • Damage
    • Cracked connectors
    • Exposed wires
    • Loose electrical terminals
    • Damaged wiring loom and conduit
    • Worn, missing, or cut pass-through connector O-ring seal.
  3. Install the transmission wiring harness pass-through connector into the transmission case. Ensure connector tabs lock into place.
  4. Move the harness to one side in order to install the valve body.

  5. Object Number: 7741  Size: SH

    Important: Valve bodies are model dependent.

    Important: Some models do not use a #5 ball check valve.

  6. Install the ball check valves (2-6, 8, 12) in the valve body and retain ball check valves with J 36850 or an equivalent.
  7. Notice: Refer to General Repair Instructions in the Preface section.


    Object Number: 7742  Size: SH
  8. Install the valve body over the J 25025-5 , and connect the manual valve link to the manual valve.
  9. Install two valve body retaining bolts (62) to hold the valve body in place.
  10. Remove the J 25025-5 .

  11. Object Number: 1462820  Size: SH
  12. Install the valve body bolts (62) that are shown only.
  13. Finger tighten the bolts.

  14. Object Number: 829178  Size: SH
  15. Inspect the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly for the following conditions:
  16. • Damage
    • Debris
    • Damaged or missing O-rings
    • Cracked connector
    • Loose electrical terminals
    • Poor terminal retention
    • Sediment in switch membrane

    Object Number: 829171  Size: SH
  17. Install the TFP manual valve position switch (69) and retaining bolts (62, 70).

  18. Object Number: 1552915  Size: SH
  19. Install the transmission wiring harness on the valve body.
  20. Notice: Refer to Fastener Notice in the Preface section.

  21. Install the TCC solenoid valve and retaining bolts (68).
  22. Tighten
    Tighten the bolts to 8-14 N·m (6-10 lb ft).

    Notice: Refer to General Repair Instructions in the Preface section.


    Object Number: 1220976  Size: SH
  23. Check that all the valve body retaining bolts are in the correct location.
  24. Each bolt number refers to a specific bolt size, as indicated by the following list:

    • 1 -- M6 x 1.0 x 65.0
    • 2 -- M6 x 1.0 x 54.4
    • 3 -- M6 x 1.0 x 47.5
    • 4 -- M6 x 1.0 x 17.7
    • 5 -- M6 x 1.0 x 35.0
  25. Tighten the retaining bolts from the center of the valve body working your way out in a spiral pattern to the outside edge.
  26. Tighten
    Tighten the retaining bolts to 8-14 N·m (6-10 lb ft).


    Object Number: 405022  Size: SH
  27. Install the TCC PWM solenoid valve (396) and the solenoid retainer (395).

  28. Object Number: 1552913  Size: SH
  29. Snap the wiring harness in place on the valve body bolts. Ensure the harness loom tab is located under the TFP switch.
  30. Install the wiring connectors to the electrical components as indicated by the following list:
  31. • 1 - Transmission Fluid Pressure (TFP) manual valve position switch
    • 2 - 1-2 Shift Solenoid
    • 3 - 2-3 Shift Solenoid
    • 4 - Pressure Control Solenoid (PCS)
    • 5 - Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
    • 6 - 3-2 Shift Solenoid
    • 7 - Input speed sensor (ISS) - model dependent