The transmission is controlled by an electronic shift system. BUT processes input signals. Based on the information received, the BUT controls the hydraulic control system.
The electronic switching system consists of the following components:
- transmission control unit (BUT),
- switching solenoids (SP1 and SP2),
- pressure control solenoid (SKD),
- blocking solenoid,
- input shaft speed sensor (SVV),
- output shaft speed sensor (OutV).
- transmission fluid temperature sensor (TTZ),
- park/neutral position switch (PPN).
Park/Neutral Position Switch (PPN)
Park/Neutral Position Switch (PPN) transmits information ranging from the gear lever to the starter and BUT.
The PPN switch can only start the engine in the position «R» And «N». (Prevention of reckless driving).
The PPN switch causes the reversing lamp to light up when reversing.
It is used for the PPN switch when switching the regulator.
The PPN switch transmits information through a combination of a starter circuit and a reverse circuit to the vehicle directly without the BUT
| Component | Function | |
| C1 | Forward clutch | Connects input shaft and front sun gear |
| C2 | Straight coupler | Connects input shaft and planet carrier |
| NW | Reverse clutch | Connects input shaft and rear sun gear |
| IN 1 | Lead brake and 2nd brake | Prevents the rear planetary sun gear from turning clockwise or counterclockwise |
| AT 2 | 2nd brake | Prevents the F1 outer race from turning clockwise or counterclockwise, thus preventing the rear sun gear from turning counterclockwise |
| VZ | 1st and reverse brake | Prevents planetary carrier from rotating clockwise or counterclockwise |
| F1 | One way clutch #1 | In B2 operation, this clutch prevents the rear sun gear from rotating counterclockwise |
| F2 | One way clutch #2 | Prevents counter-clockwise rotation of the planetary carrier |
| planetary gear | These gears change the path through which the driving force is transmitted according to the operation of each clutch and brake, in order to increase or decrease the speed of the input and output shaft | |