I'm sure most of you guys have seen this promotional video. (Video Below) I have noticed that the ABD traction system is quite prominent in Cayenne in the video and also in an other Cayennes' I've seen offroad. On my 2004 CTT the brakes do not modulate wheel spin at all. Sometimes I can hear the brakes going off but that is usually when the car has started to roll backwards and has activated downhill assist. Where should I start looking to diagnose this issue? Below I have also attached a video of my CTT failing to shuffle power to the wheels with traction.

Porsche Promotional Offroad video:


Video of my CTT with no ABD:

https://www.youtube.com/watch?v=ojhbcyq7r48

 

Did you have the diff locked in? I really don't know but it seems it should be active at all times but maybe it only activates when the diff is locked in? I agree it seems yours is not acting like the one in the video though.