
I've not had the mental ability to drive far either and hence why the Activa has been put away again


There was no way I could even attempt such a trip such as going to Wetherby and back..
Things are still not right so please bear with me a little.
Anyway, yesterday I did manage something significant. I finally got the ELIT talking to the gearbox ECU on my XM

So the car definitely has an S2 Xantia ECU fitted.
The fault turned out to be a torque reduction fault whereby the ECU cannot signal to the Engine ECU to retard timing (and thus reduce torque) when making gear changes. The fault cleared and so far has not reappeared..
Looking at the circuits for both the S1 and S2 Xantia I see that on the S2 both K and L diagnostic lines from the engine and gearbox ECUs are linked together whereas in the S1 they're not, only the K line being linked.
I'm wondering if the ECUs talk to each other over the K and L lines?
The research goes on but I believe the Engine ECU and gearbox ECU may be incompatible with each other. Not to worry though as it doesn’t seem to cause much issue with driving but may explain whey the car feels very lively...
Now off to try and catch up on what's been happening. That's if the old brain will let me
