Valve Body: Service and Repair

Mechatronic

• Always replace the Mechatronic unit if it is dirty or faulty.

• General repair notes => [ General Repair Information ] General Repair Information.

• Rules of cleanliness for working on automatic transmissions => [ Clean Working Conditions ] Clean Working Conditions.

Removing

CAUTION!
Observe procedures for disconnecting battery.

- Switch ignition off.

- Remove cover - arrows - of the luggage compartment right side trim.





- Remove cover - 1 - from above battery.





• Disregard - 2 -.

- Disconnect Ground (GND) cable - arrow - at the battery.





- Remove oil pan => [ Oil Pan ] Service and Repair.

- Remove oil screen => [ Oil Strainer ] Service and Repair.

- Disconnect electrical connector - 2 - on transmission by turning screw connections counter-clockwise.





• Disregard - 1 -.

- Touch vehicle ground with hand (without gloves) to discharge static.

CAUTION!
• Always discharge static by touching a grounded object, e.g. vehicle ground, before touching or removing the Mechatronic unit.

• Never touch contacts in 16-pin connector, as the static charge could destroy the control module and thus the Mechatronic unit.

- Remove wiring harness connector securing clip - arrow - on outside of transmission housing.





- Remove Mechatronic bolts - 11 to 1 - in sequence.





• Only bolts marked with - 1 to 11 - may be loosened.

• If other bolts are loosened, this may affect the function of the Mechatronic unit or it may come apart.

- Remove Mechatronics unit together with wiring harness from transmission, at the same time guiding out connector for wiring harness.

Installing

- Make sure that seal - B - is properly installed and secured.





- Replace wiring harness connector O-rings and lightly coat with ATF.

- Clip wiring harness - A - onto the Mechatronics unit - B -. At the same time, insert tab - arrow - on backside of wiring harness into the Mechatronics unit.





• If the tab on the backside of the wiring harness breaks off, the wiring harness must be replaced => [ Wiring Harness in Transmission ] Service and Repair.

- Insert wiring harness connector into transmission housing.

• Installation position: Flat part of rear collar faces downward; tabs on collar are horizontal.

- Set Mechatronics unit in place without using force, and at the same time insert stud of selector lever - arrow - into groove of selector slide - A -; if necessary, move selector slide back or forth.





- Tighten bolts - 1 - and - 2 - for Mechatronic unit to 2 Nm.





- Then tighten bolts to 8 Nm in specified sequence - 1 to 11 -.

- Connect securing clamp - arrow - on wiring harness connector.





- Install oil strainer => [ Oil Strainer ] Service and Repair.

- Install oil pan => [ Oil Pan ] Service and Repair.

- Connect battery.

- Fill with ATF => [ ATF, Draining or Filling after Repair ] ATF, Draining or Filling After Repair.