Thanks very much for this.
i'll read it tomoz cos I am sh!t at understanding maths, physics etc in the evenings. My brain just doesn't work well.
but I am grateful ever so much for you having bothered to try to explain this stuff to me.
But just ojne thing before I sleep on all, this.
TCU? Is that what most of us call the BCU? and is it the triangular thing under the passenger seat?
Cos altho i have taken the ECM out loads of times I have never touched the BCU.
Sorry to ask such a basic question.
The rest of it seems to be simply a question of wiring like wot I am used to, relays etc.
Once again, thanks.
Stan
TCU transmission control unit, I think LR call it EAT electronic Auto Transmission ECU