Brief Description

General
The AF20/AF22 automatic transmission is an electronically controlled 4-speed automatic gearbox that is fitted to the Saab 9-3 together with different engine variants.

The AF20/AF22 is principally designed around a 4-speed planetary gear train, torque converter with Lock-Up clutch and hydrate and electronic control systems.

The transmission is governed by a control module (TCM), which continuously processes information received from its own sensors as well as from other control modules. It controls the hydraulic system in the transmission based on the processed information.

Compared with conventional, hydraulically controlled transmissions, the AF20/AF22 has the following advantages:

- Improved shifting performance and smoother shifting as torque is reduced when shifting takes place.

- Improved fuel economy thanks to driving programs optimized to fuel consumption.

- Selection of varying driving programs: NORMAL, SPORT, WINTER.

- Reduced mechanical load on the entire transmission.

- Self-diagnosis and storage of diagnostic trouble codes.