Electrical level are 0 - 12V and only the diagnostic tester have a 510 Ohm pull up.
For the key bytes, I do not remerber well and it works, but I confirm the ISO14230 key bytes are the same as ISO9141
I don't know if I could help but at least I've tried
---------- Post added at 12:24 AM ---------- Previous post was at 12:16 AM ----------
I'm back, I've checked on the ISO14230-2, there is timing to respect between each step of the initalization...
No other clue from my side