I looked at the wiring diagrams and my above assumptions are wrong. The OBD port does connect straight to the Ford ECU. I also tried a different scan tool in Ford mode and I was able to get it to connect; I guess that the other one wasn't good enough.
Therefore I should be able to implement a mode that goes straight into the Ford V8 ECU without going via the Gateway ECU as the T4.
Anyway, I have already gotten the Gateway ECU protocol working. These are the screenshots:-
V8 Gateway ECU
I think that the numbers for Revs and Coolant temp are a bit off, I need to re-check them.
X12 V8 Engine ECU (in T4 mode - via the Gateway ECU)
I haven't finished reverse engineering all the live data parameters (there are lots) yet. I will update when that's done.
One other thing to note is that the protocol runs a bit slower in a real car than it does with just the ECU on a bench.
In the car you can talk directly to the ECU in Ford mode but the Gateway ECU is still there chatting away on the same databus, and I think that this slows things down, or, you can go through the Gateway ECU but then you are talking to one ECU through another, which also slows it down.
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