I'd be interested in how you get on with this.
I have T5 Transporter too, but no
on my old '04. Mine had started doing some odd things at idle that to me sounded like a load had been applied. So in a way it was almost the opposite to yours in that the idle was normal most of the time but then would dip. If you are happy experimenting with
and at your risk you could try what I did and code out the load sensing function in the J519 just to see if it makes a difference. On mine this stopped the alternator DF code being set and stopped the idle speed dipping.
I'm absolutely not saying this is a cure, I think I may need a J519 or an alternator but I do seem to have a temporary fix. It would be interesting to know what battery voltages are showing in the J519 on your van, mine was showing 17.7v! But this mad voltage wasn't duplicated in any other controller.
http://forums.ross-tech.com/showthre...nagement-fault