Mechatronics unit, removing and installing

WARNING: This page is about a different variant/trim than selected.

NOTE:

Always replace mechatronics unit if it is dirty or faulty.
Rules of cleanliness for working on automatic transmissions → Rules of cleanliness for working on automatic transmissions .
General repair notes → Repair instructions .

Removing

Disconnect battery → 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
Remove oil pan → Oil pan, removing and installing .
Remove ATF screen → ATF screen, removing and installing .

Fig 1: Disconnecting/Connecting Electrical Connections On Transmission

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Rotate electrical connector at left of transmission counter clockwise - arrow - and remove.
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 mechatronics unit.
Never touch contacts in 16-pin connector, as the static charge could destroy the control module and thus the mechatronics unit.

Pull off locking clip for wiring harness connector - A -.

Fig 2: Mechatronics Unit, Transmission Control Module J217 , Multi-Function Transmission Range Switch F125 , Sensor For Transmission RPM G182 And Sender For Transmission Output RPM G195

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove Mechatronics bolts in reverse order, i.e. first bolt - 11 - , then - 10 - , etc., up to - 1 -.

NOTE:

Only the indicated bolts - 1 through 11 - may be loosened.
If other bolts are loosened, this may affect the function of the mechatronics 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

Fig 3: Removing/Installing Oil Seal For ATF Strainer From Transmission

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Make sure that seal - B - is properly installed and secured.
Replace wiring harness connector O-rings and lightly coat with ATF.

Fig 4: Locating Wiring Harness With Connector Is Attached To Mechatronics Unit

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

NOTE:

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

Insert wiring harness connector into transmission housing.

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

Fig 5: Selector Lever & Selector Slide

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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.

Fig 6: Mechatronics Unit, Transmission Control Module J217 , Multi-Function Transmission Range Switch F125 , Sensor For Transmission RPM G182 And Sender For Transmission Output RPM G195

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Tighten bolts - 1 - and - 2 - for mechatronics unit to 2 Nm.
Tighten bolts for mechatronics unit to 8 Nm in specified order, i.e. first bolt - 1 - , then - 2 - and so on through - 11 -.

Fig 7: Locking Clip & Wiring Harness Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Attach locking clip - A - for wiring harness connector - B -.
Install ATF screen → ATF screen, removing and installing .
Install oil pan → Oil pan, removing and installing .

Fig 8: Disconnecting/Connecting Electrical Connections On Transmission

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Rotate electrical connector at left of transmission clockwise opposite direction of - arrow - and remove.
Connect battery → 27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL .
Top off ATF → Draining ATF and filling after repairs .