24 34 568 Replacing mechatronics (GA8P70H) N55_Hybrid

Special tools required:

IMPORTANT:

Do not let skin come in contact with transmission oil and do not inhale fuel vapours.
Wear protective gloves.
Ensure adequate ventilation.

NOTE: After completing repair work:

Load specific data version with ISTA.

IMPORTANT: After completion of repair work, CHECK TRANSMISSION OIL LEVEL .
Use only approved gearbox oil .
Failure to comply with this requirement will result in serious damage to the automatic transmission!

IMPORTANT: Read and comply with notes on PROTECTION AGAINST DAMAGE FROM ELECTROSTATIC DISCHARGE (ESD PROTECTION) .

Necessary preliminary work:

Remove rear UNDERBODY PROTECTION .

Remove panels (2).

Fig 1: Identifying Mechatronics Panels (Hybrid)

IMPORTANT: Mechatronics can be destroyed by static discharges. Therefore the contacts inside the connector must not be touched. Insert special tool immediately after operation.

Unscrew connector (1) and disconnect.

Fig 2: Removing Mechatronics Connector (Hybrid)

Insert special tool 24 2 390 in sealing cup (1).

Fig 3: Inserting Special Tool (24 2 390) Into Sealing Cup - Hybrid

Remove TRANSMISSION OIL SUMP

Remove OIL PUMP (IEP)

Release screw (1) and unlock sealing cup with slide (2).

Tightening torque 24 30 4AZ .

Fig 4: Unlocking Mechatronics Sealing Cup (Hybrid)

Note position of sealing cup.

Pull out sealing cup (1).

Installation note:

Fit sealing cup in position (lug on inside). Turn until lug engages in groove of transmission. Slide in sealing cup.

Lug on sealing sleeve must not be damaged!

Fig 5: Removing Mechatronics Sealing Cup (Hybrid)

Release all screws (1 and 2).

1 = M6 x 59 mm
2 = M6 x 20 mm

Remove mechatronics.

Installation note:

Replace O-rings for oil ducts on the mechatronics unit and wet with automatic transmission fluid.

Fig 6: Identifying Mechatronics Screws (Hybrid)

Installation note:

Check gasket (1) for damage.

Replace the gasket (1) if necessary.

Coat new seal with automatic transmission fluid and install.

Fig 7: Identifying Mechatronics Gasket (Hybrid)

Screw in guide pins 24 1 430 at screw position 4 and 9.

Fig 8: Identifying Mechatronics Guide Pins (24 1 430) - Hybrid

Fit mechatronics unit.

Fit shift claw (2) in gearshift shaft (3) by pressing release lever (1).

Fig 9: Shifting Gearshift Claw Using Lever - Hybrid

Screw down wing nuts as far as they will go on to the mechatronics unit.

Fig 10: Identifying Mechtronics Unit Wing Nuts - Hybrid

Installation note:

Insert screws until screw heads make contact.

Remove guide pins and fit remaining screws.

IMPORTANT: Tighten down screws in order 1...18.
Failure to comply with this requirement will result in serious damage to the automatic transmission!
Tightening torque 24 30 4AZ .

Fig 11: Automatic Transmission Valve Body (Mechatronics) Screws Tightening/Loosening Sequence