Valve Body: Service and Repair

Mechatronic Unit

Removing

• Automatic transmission clean working conditions, refer to => [ Clean Working Conditions ] Clean Working Conditions.

• General repair instructions, refer to => [ Repair Information ] Repair Information.

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

- Disconnect the battery.

- Remove the ATF oil pan. Refer to => [ Automatic Transmission Fluid Oil Pan ] Service and Repair.

- Remove the ATF strainer. Refer to => [ ATF Strainer ] Service and Repair.

There is a risk of destroying the transmission control module (Mechatronic) with static discharge.

• Before touching or removing the Mechatronics unit, you must first discharge yourself of any static electricity by touching (bare handed) some grounded metal object (for example car, lifting platform).

- Touch the vehicle ground with a bare hand to discharge the static electricity.

• To remove the Mechatronic, first remove the connector - C - and the wiring harness - B - from the mechatronic. The wiring harness connector - A - remains installed in the transmission housing.






• If the tab - arrow - on the backside of the wiring harness breaks off, the wiring harness must be replaced.

• The following description shows the Mechatronic removed. The wiring harness connector - A - is still installed in the transmission housing.






• The connector - C - may be installed with or without locking mechanisms - 1 - and - 2 - depending on the version.

- Release both locking mechanisms - 1 - and - 2 - on the connector - C -, if applicable.






- Disconnect the connector - C - from the socket - D - on the Mechatronic.

- Remove the wiring harness - A - from the Mechatronic - B -. Disengage the tab - arrow -, on the back of the wiring harness, from the Mechatronic.

• If the tab - arrow - on the backside of the wiring harness breaks off, the wiring harness must be replaced.

- Carefully lay the wiring harness aside.

• The wiring harness is connected to the installed connector - 3 - and cannot be removed.

- Remove Mechatronic bolts in reverse order, for example first bolt - 14 -, then - 13 -, through - 1 -.






• Only the indicated bolts - 14 through 1 - may be loosened.

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

- Remove the Mechatronic from the transmission.

Installing

• Tightening specifications, refer to => [ ATF Pan, ATF Strainer and Mechatronic Overview ] Description and Operation.

- Make sure the seal - B - is installed correctly and is secure.






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






- Tighten the bolts - 1 - and - 2 - on the Mechatronic to 2 Nm.






- Tighten the bolts on the Mechatronic to the tightening specification and in the given sequence, that is, first bolt - 1 -, then - 2 - through - 14 -.

- Attach the wiring harness - A - to the Mechatronic. At the same time, insert the tab - arrow - on the back of the wiring harness into the Mechatronic unit.






• If the tab on the backside of the wiring harness breaks off, the wiring harness must be replaced.

- Remove both locking mechanisms - 1 and 2 - on the connector - C - as illustrated, if applicable.

- Carefully insert the connector - C - into the Mechatronic connector socket.

- Press both locking mechanisms - 1 and 2 - in on the connector - C - to secure it, if applicable.






Install in reverse order of removal paying attention to the following:

- Install the ATF strainer. Refer to => [ ATF Strainer ] Service and Repair.

- Install the ATF pan. Refer to => [ Automatic Transmission Fluid Oil Pan ] Service and Repair.

- Fill the ATF. Refer to => [ ATF, Draining or Filling after Repair ] ATF, Draining or Filling After Repair.