Self Study Program 20 – Automatic Gearbox – Fundamentals

VAG SSP 20. This self study programme is intended to impart to you the basic design of an automatic  gearbox and the operation of certain components. The components presented apply in the vast majority of cases to all automatic gearboxes or are identical to those used in gearbox 01M fitted to the OCTAVIA.

The gearbox in a motorcar is the technical aid for converting the engine forces into the varying operating conditions.

Operating the clutch and shifting gears make up the lion’s share of the physical effort involved in driving a motor vehicle.

The purpose in using „self-shifting gearboxes“ is to considerably reduce this physical effort, enhance active safety so that the driver’s responsiveness is directed fully to the traffic situation.

The progress in electronics makes it possible to interlink electronic functional details and hydraulic systems and to achieve safe „automatic“ driving with a high level of efficiency.
That is why automatic gearboxes feature increasingly as part of the equipment available in modern motor vehicles.

The operating principle of an automatic gearbox is basically the same in all passenger cars. They vary in design details depending on how they are installed and on the power output of the engine.


  • Power Conversion
  • General Design
  • Determining Shift Point
  • Automatic Transmission Fluid
  • Torque Converter
  • Lock-up Clutch
  • Planetary Gear Systems
  • Shift Elements
    • Multi-disc clutch
    • Multi-disc brakes
    • Band brakes
    • Freewheel
  • Gearbox Control
    • System overview of an automatic gearbox
    • Emergency programme/Self-diagnosis
  • Hydraulic System
    • Hydraulic fluid circuit/hydraulic fluid pump
    • Hydraulic shift control unit
    • Diagram of hydraulic system
    • Pressures in the hydraulic system
    • Hydraulic shift elements
  • Test Your Knowledge

You can find specific information on the automatic gearbox 01M fitted to the SKODA OCTAVIA in the Self Study Programme Booklet 21.

Language: English
Format: PDF
Pages: 38

Self Study Program 20 – Automatic Gearbox – Fundamentals PDF free online