Below is a description using the example of AT A5S 310Z.
1. Remove the AT oil pan (see section Removal and installation the oil pan).
2. Unscrew the bolts and remove the mesh oil filter.
3. Remove the cover (1) from the AT hydraulic control unit.
4. Remove the hydraulic control unit from the AT housing.
Remove only bolts with a head (A) of 12 mm.
5. Turn the wiring connector to the left and pull it out.
6. Remove the clamp bracket and press the electrical wiring connector into the AT housing.
7. Remove the hydraulic control unit with the wiring harness.
8. Installation is carried out in reverse order. Please note the following points.
9. Make sure that the centering pins (1) are installed correctly. The pin (3) of the selector lever must engage with the groove of the sliding valve (2).
10. Replace the sealing rings.