MECHATRONIC Unit

WARNING: This page is about a different car, the 2010 Audi A4 and 2009 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Removing

NOTE:

Automatic transmission clean working conditions, refer to CLEAN WORKING CONDITIONS .
General repair instructions, refer to REPAIR INFORMATION .
Always replace the Mechatronic unit if it is dirty or faulty.

-- Disconnect the battery. Refer to Removal and Installation .

-- Remove the ATF oil pan. Refer to AUTOMATIC TRANSMISSION FLUID OIL PAN .

-- Remove the ATF strainer. Refer to ATF STRAINER .

CAUTION:

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.

NOTE:

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.

Fig 1: Identifying Mechatronic Wire Harness

Courtesy of AUDI OF AMERICA, LLC

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.

Fig 2: Identifying Locking Mechanism

Courtesy of AUDI OF AMERICA, LLC

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.

Fig 3: Remove/Install Mechatronic Wire Harness Components

Courtesy of AUDI OF AMERICA, LLC

-- 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.

NOTE:

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.

NOTE:

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-.

Fig 4: Identifying Bolt Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

NOTE:

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 .

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

Fig 5: Removing/Installing Oil Seal For ATF Strainer From Transmission

Courtesy of AUDI OF AMERICA, LLC

-- 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.

Fig 6: Inserting Transmission Selector Lever Stud Into Groove On Selector Slide

Courtesy of AUDI OF AMERICA, LLC

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

Fig 7: Identifying Bolt Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- 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.

Fig 8: Remove/Install Mechatronic Wire Harness Components

Courtesy of AUDI OF AMERICA, LLC

NOTE:

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.

Fig 9: Identifying Locking Mechanism

Courtesy of AUDI OF AMERICA, LLC

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

-- Install the ATF strainer. Refer to ATF STRAINER .

-- Install the ATF pan. Refer to AUTOMATIC TRANSMISSION FLUID OIL PAN .

-- Fill the ATF. Refer to ATF, DRAINING OR FILLING AFTER REPAIR .