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You could try running a wire from the Alarm unit Plug A Pin 23 to the DME Plug A Pin 3, just in case there is a break in the wire somewhere.

Other than that, I think that maybe those additional boxes near the DME might be something to do with it. Can you see if they break in to a green wire (the W-Line) in the loom? If not, then perhaps the DME has failed, which would be highly unusual. Did you check fuse C1 when you did your initial fuse checks?

 
Hi Richard,
Thanks again - I'll give that a try!
Question - Is it possible to test for a signal on that line at the DME with something like an oscilloscope? (or do I risk damaging the DME). Just a thought, as if it's a digital signal, it may be too high a frequency for a scope anyway??
Jeff
 
Probably easier to unplug Plug A from the alarm module, Plug A from the DME, and do a simple continuity check between pin 23 on the alarm plug and pin 3 on the DME plug. Also check that the wire doesn't go to ground.
 
I had to put this on hold for a couple of weeks while I dealt with some other non-car related problems, but finally got around to it again.
I eventually had to get the car collected by Ninex Motorsport and after testing, they diagnosed that it was indeed the DME that had failed! This is apparently a VERY rare occurrence and there is no indication of why it may have happened. However, it's still not totally straightforward to fix as the car has the X50 option pack, which means that it needs a special software map, which Ninex are currently in the process of obtaining from Germany.
It's been a couple of months since I drove it last and now I can't wait to get the car back!
 
That's a bit of a shocker - very rare indeed. The fuel maps are stored on the PIWIS tester, but you need the security codes from Porsche to load them on the car. The X50 map also needs a special programming code to transfer it. I would have thought they should be able to get the codes from Porsche GB, but I'm sure NineX know what they are doing.
 
Well, I finally have a running car again - Yayyy!!!!!
Ninex fitted a new DME (£Ouch!) and had a bit of a battle getting the X50 unlocking code from Germany, but were persistent and got it sorted in the end - Thanks Andy!
Still a few other jobs to be done on the car, but I'll drive it for a while and look at them later.
 
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