Removing and installing/replacing hydraulic control unit (6-speed, AISIN GA6F21AW)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2021 MINI Cooper, 2020 MINI Cooper, 2019 MINI Cooper, 2018 MINI Cooper, and 2017 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: AFTER COMPLETION OF WORK, CHECK TRANSMISSION OIL LEVEL .
Note the amount of released automatic transmission fluid.

IMPORTANT: Use only the approved automatic transmission oil: ATF6 (BMW/MINI part number 83 22 2 355 599).
Otherwise the automatic transmission may incur extensive damage!
Do not drain oil before the transmission has cooled down.

Necessary preliminary work:

Disconnect BATTERY GROUND LEAD .
Drain off TRANSMISSION OIL .
Remove LEFT CHARGE AIR DUCT .
Remove FAN COWL .
Remove RADIATOR .
Remove CHARGE AIR COOLER .
Remove the EGS .

Removal:

Release screws and remove cover.

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Unscrew the screws (1).

Remove locking plates (2) with oil temperature sensors (3).

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Disconnect connectors of solenoid and control valves.

IMPORTANT: Pay attention to routing of cables.

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Release output RPM sensor connector (1) from holder and place to one side.

IMPORTANT: Observe connector (1) installation position.

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IMPORTANT: Screws have different lengths.
Numbers: 3, 4, 6, 7, 8 = 21 mm.
Numbers: 2, 5 = 31 mm.
Number: 1 = 51 mm.

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Evenly release screws in specified sequence.

Fig 1: Transmission, Selector Unit And Screws Loosening Sequence

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Disconnect lever (1) from gearshift shaft.

When removing selector unit, slide in gear selector valve (2) and hold down.

Remove selector unit.

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Installation:

Join shift unit to transmission.

Pull gear selector valve (2) slightly out of shift unit.

Insert lever (1) into gearshift shaft.

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IMPORTANT: Screws have different lengths.
Numbers: 1, 2, 3, 5, 6 = 21 mm.
Numbers: 4, 7 = 31 mm.
Number: 8 = 51 mm.

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IMPORTANT: Insert screws slightly during installation, align selector unit and tighten down in specified order

Tightening torque: 24 30 2AZ .

Fig 2: Transmission, Selector Unit And Screws Tightening Sequence

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Clip output RPM sensor connector (1) onto holder.

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Install oil temperature sensors (3) with locking plates (2) and screw.

Tightening torque: 24 30 3AZ .

IMPORTANT: Coat the gaskets with automatic transmission fluid.

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Connect and lock connectors of the solenoid and control valves.

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Parts: Replace the screws, cover and liquid sealing compound.

Clean sealing surface of transmission and completely remove the sealing compound.

Apply new liquid sealing compound.

Install cover and screw.

Tightening torque: 24 30 1AZ .

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Required follow-up work:

Install RADIATOR .
Install FAN COWL .
Install CHARGE AIR COOLER .
Install left CHARGE AIR DUCT .
Install the EGS .
Add TRANSMISSION FLUID .
Connect BATTERY GROUND LEAD .