OTOF

<ul><li><a href="http://tech.vw.com/audipdf/a010005.pdf">http://tech.vw.com/audipdf/a010005.pdf</a</li></ul>

John P.

Isn't "bypass valve" synonymous with "diverter valve?"

Mozzi

oops. i meant YES, they are the same t hing...

Jim TT

..are doing is a vacum leak down test of that vacum line, if it does not hold vacum a torn divereter valve dyaphram is the probable cause. To make sure they are clamping off the line at the DV valve and if it then holds vacum the DV valve is faulty. The DV is replaced and the ecu is then reset to standard. JIM

OTOF

Thanks for the translation, Jim.

Marius

Now that we've all figured the bypass system, will someone explain the secondary air system?

frank

I musta missed that

Jenner

I *think* it's only found on a 225TT

Jim TT

No I must have not been exact enough in my word choice, they cleared DTC codes, is that better?

Andy P.

so the black platic box on top of the cam cover is a vacuum storage vessel, just as I suspected ;-)

Andy P.