Technical Descriptions

Automatic transmissions AF20 and AF22 are electronically-controlled 4-speed automatic transmissions which are fitted together with different engine variants.

The transmission is controlled by a Transmission Control Module (TCM), which is fed with digital and analogue signals. The TCM uses this information to control the transmission's hydraulic system by means of electronic control signals.

Compared with the conventional hydraulically-controlled transmissions the AF20 and AF22 have the following advantages:
^ Improved quality and softer gear-shifting, as the torque is reduced during gear-shifting
^ Lower fuel consumption because of a driving program which is designed to optimize the consumption
^ The possibility to select various driving programs: NORMAL, SPORT, WINTER
^ Reduced mechanical stresses on the entire transmission
^ Self-diagnosis and storing of diagnostic trouble codes