9.2. Automatic transmission (AT)
||Earlier models are equipped with 3-step automatic transmission (AT) of ZF 3HP 22. On latest models 4-step automatic transmission of ZF 4HP 22 or ZF 4HP EH with electronic control is used.
In view of complexity of mechanisms of coupling and control systems of hydraulics, and also due to the need of use of special tools for major maintenance of AT, this work usually is not made in house garage. Therefore the general descriptions of procedures of diagnostics of malfunctions, routine maintenance, adjustment, and also removal and transmission installation are included in this Chapter only.
If AT needs the general repair, it is necessary to provide its performance to specialists of dealer office of the BMW company or a workshop in repair of transmissions. With a view of economy of means you can make removal and installation of transmission is independent, however remember that the most part of tests on diagnostics of malfunctions demands, that transmission was in the car.
If you decided to replace transmission on new or restored, at first make sure, whether it suits your car. Identification шильдик transmissions is in the left part of a casing, directly behind the selector lever.