General information (Opel Astra G)

Automatic transmissions are installed on some of the vehicles in question. The transmission consists of a torque converter, planetary gear, multi-plate hydraulic clutches and servo brakes. Transmission control is provided by a processor unit through 4 electromagnetic valves. Three driving modes are provided - economy, sport and winter.

Economy mode is standard, it is activated when driving at low speed, it provides the most economical driving with a small engine load. Sport driving mode is activated by a toggle switch on the selector lever. In this mode, the transmission automatically engages higher gears at high engine speeds, improving the acceleration dynamics of the car. In winter mode, which is activated by a button on the selector indicator panel, the third gear is automatically engaged when the car starts moving. This ensures that the necessary traction of the wheels on a slippery road surface is maintained by reducing slippage.

The planetary gear transmits torque from the engine at various gear ratios. The transmission fluid, under pressure, engages and disengages a number of hydraulic clutches and servo brakes under the influence of signals from the processor unit.

The transmission is controlled by a selector lever that can be locked in 6 positions. In position D of the selector, automatic change of 4 speeds is provided. For automatic switching of the transmission to a lower speed (increased gear ratio) when the throttle valve is fully open, a kick-down device is provided. In selector positions 2 and 3, the car can move at speeds corresponding to two or three gear ratios, respectively, and in position 1 - only the first gear ratio. It is prohibited to switch the transmission to positions 1-3 at high engine speeds.

Any repair of automatic transmission is performed in a car service center.