I have opened the looms and found no damage. I can trace the grey wheel speed wire from the ABS to the near side under the fuse box. From here it goes under the arch and looks to go inside the car. As far as I can see this speed signal does not go directly to the trans ecu. There was no continuity between the grey wire and any trans ecu multiplug pin while the fault was not present. It looks to me like it is a missing CAN signal.
Looking at diagrams on dialogys is not easy. If I was looking at the right info then that would back up my thoughts that it is a CAN signal. When I get more time I am going to try and identify the correct diagrams.
For DF048 Dialogys suggests checking the wheel speed signals in the ABS and then the network. Again, sounds like a CAN signal to me.
I have warned the customer that if it happens again, as I expect it will, I will need the car longer. I will update when I get the inevitable phone call.
In the meantime, if anyone knows how the speed signal is routed I would be interested to hear it.
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