System overview, automatic transmission
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System overview, automatic transmission
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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:
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Improved shifting performance and smoother shifting as torque is reduced when shifting takes place.
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Improved fuel economy thanks to driving programmes optimized to fuel consumption.
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Selection of varying driving programmes: NORMAL, SPORT, WINTER.
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Reduced mechanical load on the entire transmission.
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Self-diagnosis and storage of diagnostic trouble codes.
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