I have an 04 phaeton 3.2 with the factory air.
I am currently having modified struts and bags made up so I can use accair system for more lows. But the can-bus hi speed is causing the issue.
dude to missing sensors the engine ecu goes into limp and I know if the ecu is dissconnected the bus circuit is broken and same happens.
has any one managed to bypass the Adaptive suspension control unit and code out via vcds. or is it a case of leave the ecu in suite and feed a resistance down the sensor lines?
Please paste the exact log with error codes.
It sounds like you have a more serious CANBUS problem which isn't due to removing the sensors per se, but could have been caused when they were disconnected such as by shorting.
Obviously there's jacking mode, which disables the controller while the car is shut off, but resets itself shortly after the car is driven again. That could be a clue where to get started. Maybe it detects sensor changes on the road to re-enable itself, in which case it could stay off if there's no sensors.
There is reputedly a 'Transport Mode' which may or may not be the same thing, but is apparently set up in VCDS rather than inside the cabin.
You might need some unofficial advice from the factory on this one. Maybe Michael/PanEuropean (forum moderator) will be able to comment when he's back, he is on good terms with the engineers.
If you want to post details and maybe photos of your project, I'm sure folks here will be interested to learn something about your car and what customisation is being done to it.
But quite understand if it's a private project. I hope someone can help. It's not part of the system that often gets programmed out, of course, for regular street use it's pretty much a premium system!
There's no Phaeton version sold without the Air Suspension, so I doubt there are any available codings that fool it into thinking it's the cart spring model...
The 'normal' approach to removing option controllers is to pull the plugs and then recode the CAN bus Gateway Controller with the same code as before, so it re-scans and omits the missing unit. After that, the other controllers revert to their 'absent controller' modes and get on with life as best as they can.
But the suspension controller has a finger in so many pies that this doesn't sound like a good plan, although worth trying. I think you might get a Christmas tree of icons on the dash panel though, and probably the traction control and Cruise would be disabled, maybe even get Limp Home mode on the engine ECUs and headlight warnings. (edit - sorry, just re-read your #1 post that Limp Home mode is definitely a problem...)
You sound like a Pro, so I guess you know the VW Air Suspension SSP document backwards, but it sure does list a lot of vehicle components that communicate with it.
I guess if the system was left active, with the level sender link arms disconnected and the wheel & body acceleration sensors dummied out, together with the steering wheel angle sensor, you might kludge it.
The suspension wakes up after 2, 5 and 10 hours of being parked to re-level, I don't know if it would drain the battery if it wasn't happy at those times.