Can’t you guys spell “solid sate memory”????????
Sold at you local 7-eleven as “Flash Memory Stick”, or some such. 16GBytes at least is now dirt cheap, and you can BANK on (much) bigger ones coming tomorrow ..............
I'd imagine the write interface is tamper-proof, so there's not much chance of being able to wipe the memory. But since the engine management module is feeding data into that memory constantly, there has to be some kind of interface you could tap into. And if you knew the microcode, you could erase the entire contents.
Or just enough of it to make the rest unreliable.