I've been searching for the european version of the vacuum hose routing diagram for a few years now.
And I finally got my hands on the original european extension of the FSM.
The diagram is in german but I copied the descriptions/translations from different manuals together.
Hope this also helps someone else.

German:


English:


This is my first time posting on here. Not sure if I'm doing this right...

 

While tracing the vacuum lines and testing the ones on my car, I noticed that the diagram contains an error.
There are two lines that got mixed up. Here is how they should connect:


Which is confirmed by the two-stage pressure regulator diagram:

 

interesting. we've seen people ask about this system over the years, but since it seems to be Europe only, we could only guess as to what it does