Diagnostics gubbins/mapping

[Ruan]

Best thing you can do is to start reading the EDC15C/+/VM+ Funktionsbeschreibung. There's a few variants kicking around, one in English too if you search for it, they explain how particular versions of the ECUs work. Also my best advice is to ignore what other people call maps and describe how they work and read the official documentation... The amount of times I've read bits and bobs and think I understand how it works only to really read the documentation well and realise it's quite different. Once you start reading those documents, you'll begin to understand how it all goes together.

Basically as always, if you want to understand how it works, you'll read all about how it works and start to understand it and you'll spend a huge amount of time on understanding it and a lot of money on kit to allow that. If you want a remap, it's easier and overall cheaper to find and pay someone to do it...