Hydraulic Control Unit Dismantling and Assembling

Dismantling and assembling hydraulic control unit




Component view




Designations and notes

Removal

NOTE: The transmission wiring harness remains on the transmission.

1. Remove the transmission underbody cladding.




A Drain Screw With Sealing Ring

2. Drain off ATF fluid.




B Hollow Screws
C Fixing Screws

3. Remove ATF pan. To do this, unscrew hollow screw for oil level pipe and six fixing screws.





4. Remove ATF strainer with Torx Insert T 27.





5. Remove inductive speed sensor and pull wiring harness out of holding clamps.





6. Unscrew 13 fixing screws (head diameter 12 mm) with Torx Insert T 27 and lower hydraulic control unit only so far as to guarantee that the wiring harness is not subjected to any tension.
- Place the hydraulic control unit on a suitable surface (e.g. transmission jack).

NOTE: The hydraulic control unit must not be suspended from the wire harness.

7. Mark the push-on sleeves for re-installation and pull off from the solenoid valves.

8. Pull the wiring harness out of the holding clamps and remove the control unit.

Installation

Installation takes place in reverse order.

1. Tightening torques:
- Control unit to transmission: 8 Nm (6 ft lb)
- ATF strainer to control unit: 8 Nm (6 ft lb)
- ATF pan to transmission: 6Nm (4 ft lb)
- Drain screw to ATF pan: 40 Nm (29 ft lb)
- Hollow screw to ATF pan: 40 Nm (29 ft lb)





2. Push on push-on sleeves for solenoid valves up to the stop.
- Pay attention to cable colors.

3. Mount the hydraulic control unit so that the pin of the notched disk projects into the recess of the selector slide.





4. Screw in the fixing screws for the hydraulic control unit and counter slightly.
- Pay attention to screw lengths.




A Notched Disc
B Selector Slide

5. Position hydraulic control unit.
- To do this, move notched disk to position 1 (1st gear) and push hydraulic control unit back until it rests against the notched disk.
- Tighten fixing screws to: 8 Nm in this position.





6. Insert pulse sensor and mount holding plate so that the lugs engage in the connector grooves.

7. Fit ATF strainer with O-ring.
- Tightening to: 8 Nm.

8. Place two magnets in the beads of the ATF pan, fit seal and secure the pan with the holding brackets so that the short legs press onto the ATF pan.

NOTE: The two holding brackets with the straight legs must be mounted at the side.

9. Screw in ATF drain screw with new sealing ring.
- Tighten to: 40 Nm.

10. Screw in hollow screw for oil level pipe with new sealing rings.
- Tighten to: 40 Nm.

11. Fill with ATF fluid