Self Study Program 373 – EcoFuel Natural Gas Drive in Touran and Caddy

VAG SSP 373. This self-study programme describes the design and function of vehicles for natural gas operation. The petrol mode in natural gas vehicles is only slightly different to when you drive vehicles that run exclusively on petrol.

Why natural gas?

Driving with natural gas relieves the burden on the environment.

The emissions of carbon monoxide and nitrogen oxide are reduced by over 50%.

Furthermore, when natural gas is burnt, the amount of carbon dioxide produced is 20-25% less than with conventional petrol engines. Also, from an economic viewpoint, driving a natural gas vehicle is a serious alternative because of the rising petrol and diesel prices.

You will find basic information on the topic of natural gas in self-study programme no. 262 “Natural gas — an alternative fuel for motor vehicles”.


  • Introduction
    • Vehicle population
    • Service station network
  • Natural Gas Drive Components
    • Touran EcoFuel
    • Caddy EcoFuel
  • Engine Technology
    • The 2.0l/80kW natural gas engine
  • Natural Gas Supply
    • Natural gas
    • Natural gas system
    • High-pressure side
    • From high pressure to low pressure
    • Low-pressure side
  • System Overview
  • Engine Management
    • Engine control unit J623
    • Dash panel insert
  • Safety Concept
    • Natural gas system safety
  • Functional Diagram
    • Touran functional diagram
  • Service
    • Natural gas tank labelling
    • Special tools
  • 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: 52

Self Study Program 373 – EcoFuel Natural Gas Drive in Touran and Caddy Design and Function PDF free online