JustAdam

Are they all the same?

Does it matter if the one I want to get is from a 180 Quattro?

Or do I have to find one that is from the same as mine, a '01 TTQC 225?

TIA

JustAdam

Also - does it matter if it is 5 or 6 speed? - HELP-

TTschwing

Have you definitely isolated the problem or are you in the parts tossing stage??

JustAdam

take a closer look, and after having it on the lift here is what we both think.

When on the lift the rears do not move. When turning by hand the axle makes no noise so we think that the axle itself is fine.
The drive shaft is turning, and the only thing in between is the haldex unit.
We are going to purchase a used haldex, switch out the unit as well as the race controller onto the new haldex unit, and install and hope.

Your thoughts?

Could it be just a fuse or something simpler than the whole haldex unit?

Or is that a good place to start knowing what we know?

TIA - TT'ers to the rescue

TTschwing

I would step through all those before I'd get to the replacement stage.

VAG readiness checks OK?

Sure you don't have a DOA controller? (there have been a few)

Teutonix

Sorry if you've answered these questions previously, but I'd like to try to help.


Did you try the axle-turning test with the engine running? Have you tried lifting the car slightly off the ground and running it up to a low speed in first gear on the lift to see if the rear wheels engage? The haldex is designed to do absolutely nothing if the engine is not running above 300 rpm. I have read through a ton of factory tech literature in order to try to completely understand the unit, and it's really quite elegant. But it is designed to function only within specific parameters, so if they are not met, it will not work.

TTschwing

from haldex describing these static tests that I sent him. I'm also asking if they were done. There are very specific procedures to follow..

JustAdam

when I got that document, I had already picked up the car from the shop- he did state that he ran the vag test and the pumps in the haldex were working, also the haldex was communicating with the vag, I am guessing that is what lead him to think that the whole haldex is no good.

kodeTT

the connector or plug. tried the OEM back in...worked...then the Haldex race controller again...no go.

JustAdam

and see what happens - hopefully this week. Thank you for the insight - very helpful and REALLY appreciated.

Thanks again.