Self Study Program 426 – Start/Stop System 2009

VAG SSP 426. The start/stop system 2009 that is looked at in this self-study program applies to engines using the normal concept of starter and alternator in conjunction with manual and dual clutch gearboxes. It is being used for the first time in the Passat BlueMotion.

Rising fuel prices and stricter emissions laws have made it necessary for us to look for ways to save energy and reduce exhaust gas emissions in vehicles. With this in mind, a start/stop system has been developed that automatically switches off the engine while the vehicle is standing at traffic lights or railway crossings. When you resume your journey, the engine is started again without you having to turn the ignition key.


  • Introduction
  • Function and Operation
    • Operating concept
    • Start/stop operation with manual gearbox
    • Start/stop operation with dual clutch gearbox
  • System Overview
    • Start/stop system schematics
    • System communication
  • System Conditions
    • Stopping — Engine stop
    • Continuing the journey — Engine start
    • Vehicle requirements — Engine start
    • Cancel conditions
  • Electrical Components
    • Sensors and actuators
    • Display concept
    • Specially adapted components and systems
  • Test Yourself

The self-study programme shows the design and function of new developments.
The contents will not be updated.
For current testing, adjustment and repair instructions, refer to the relevant service literature.

Language: English
Format: PDF
Pages: 32

Self Study Program 426 – Start/Stop System 2009 Design and Function PDF free online