MECHATRONIC Unit: Removing

WARNING: This page is about a different car, the 2010 Audi A5, 2009 Audi A5, and 2008 Audi A5. However, it is still accessible from the selected car via links, so may be relevant.

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 BATTERY, DISCONNECTING AND CONNECTING .

-- 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: Identifying Mechatronic Wire Harness Components, Removal/Installation

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.