Mechatronics unit, removing and installing

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2009 Audi A4, 2008 Audi S4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Always replace mechatronics unit if contaminated or faulty.
General repair instructions → General repair instructions .
Read the rules for cleanliness when working on the automatic transmission → Rules for cleanliness .

Removing

CAUTION: Follow steps required when disconnecting battery →

27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL
27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL for ELECTRICAL EQUIPMENT, CABRIOLET

With ignition switched off, disconnect battery Ground (GND) strap.
Remove oil pan → Oil pan, removing and installing .
Remove ATF strainer → ATF strainer, removing and installing .

Fig 1: Disconnecting 16-Pin Electrical Connector At Transmission By Folding Out Release Tab And Turning Fastener Cap Counter-Clockwise

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect 16-pin electrical connector - 2 - at transmission by folding out release tab and turning fastener cap counter-clockwise.

NOTE:

- Item 1 - can be disregarded.

Touch vehicle Ground (GND) with your hand (without gloves) to discharge any static electricity.

CAUTION:

Before touching or removing the mechatronics unit, always discharge any static electricity by touching vehicle Ground (GND) or other Ground (GND) object with your hand.
Never touch contacts in 16-pin connector by hand, as static discharge would damage the control module and mechatronics unit.

Fig 2: Location Of Wiring Harness/Harness Connector Securing Circlip

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Unfasten retaining clip - arrow - for wiring harness connector on outside of transmission housing.

Fig 3: Removing/Installing Securing Bolts For Mechatronics Unit In Sequence

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove securing bolts for mechatronics unit in sequence - 11 to 1 -.

NOTE:

Only remove securing bolts marked - 1 to 11 -.
If other bolts are loosened, this may affect the operation of the mechatronics unit or the mechatronics unit could come apart.

Remove mechatronics unit together with wiring harness from transmission, at the same time guide out connector for wiring harness.

Fig 4: Removing/Installing Oil Seal For ATF Strainer From Transmission

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Installing

Make sure that seal - B - is properly inserted and secured.
Replace O-rings on connector for wiring harness and lightly lubricate with ATF.

Fig 5: Locating Wiring Harness With Connector Is Attached To The Mechatronics Unit

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Clip wiring harness - A - onto mechatronics unit - B - by first attaching tab - arrow - on reverse side of wiring harness to mechatronics unit.

NOTE:

If the tab on the reverse side of the wiring harness breaks off, the wiring harness must be replaced → Wiring harness in transmission, removing and installing .

Install wiring harness connector in transmission housing.

Installation position: flat part of rear shoulder faces downward, the lugs at shoulder are horizontal

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

While installing mechatronics unit without force, insert transmission selector lever stud - arrow - into groove on selector slide - A - (move selector slide backward and forward if necessary).

Fig 7: Removing/Installing Securing Bolts For Mechatronics Unit In Sequence

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Tighten securing bolts - 1 - and - 2 - for mechatronics unit to 2 Nm.
Then tighten securing bolts in specified sequence - 1 to 11 - to 8 Nm.

Fig 8: Location Of Wiring Harness/Harness Connector Securing Circlip

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Push retainer clip - arrow - onto wiring harness connector.
Install ATF strainer → ATF strainer, removing and installing .
Install oil pan → Oil pan, removing and installing .
Follow steps required after connecting battery →
- 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL
- 27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL for ELECTRICAL EQUIPMENT, CABRIOLET
.

Fill with ATF → Draining ATF or filling after repairs .