The most important components of an automatic transmission are the torque converter, planetary gear and hydraulic or electronic gear control device.
Hydraulically controlled multi-disc brakes and friction clutches are used to change gears.
The torque converter is similar in its mode of operation to a hydraulic clutch. It enables the vehicle to start moving and shift individual gears without engaging the mechanical clutch.
Gear shifting in an automatic transmission is controlled by an electronic control unit.
There are no manual driving programs such as "economy" and "sport". Instead, the control unit recognizes from the speed at which the driver presses the accelerator pedal whether he prefers a sporty or economical driving style. The unit then controls the gear shifting accordingly. The shifting times are also influenced by driving conditions such as uphill or downhill, as well as the presence of a trailer and headwind.
In case of faults in the input signals or magnetic valves, a switchover to the emergency driving program occurs. The fault that has occurred is also recorded in the memory of the failure accumulation device. This information can then be called up using the interrogation device.
To assess the performance of an automatic transmission and to correctly troubleshoot, experience with automatic transmissions of this type and the availability of appropriate working skills are required.
Warning: It is permitted to tow vehicles with automatic transmission for a distance of up to 50 km at a maximum speed of 50 km/h. If a flatbed for transporting vehicles is available, only the front of the vehicle may be lifted. All-wheel drive vehicles must be supported on the flatbed with all four wheels.
(The information is presented on the website: VWMANUAL)
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