WIS Document: 11279

| | System overview, automatic transmission The AF 22 (B204L/B234i/B258i) is an electronically controlled 4-speed automatic transmission which, in combination with different engine versions, is fitted in the Saab 900. The transmission is controlled by an electronic system in which a transmission control module continually processes input signals and information received from a number of sensors. On the basis of the results obtained, it controls the automatic transmission's hydraulic system. Compared with conventional hydraulically controlled transmissions, the AF22 has the following advantages: | • | Improved shifting performance and smoother shifting as torque is reduced when shifting takes place. | • | Fuel saving through a consumption-optimized driving program. | • | Option of selecting different drive programs: NORMAL, SPORT, WINTER. | • | Reduced mechanical stresses on the entire drivetrain. | • | Self-diagnosis and storage of diagnostic trouble codes.