Oodles of information there, yes.
For my ER_01 error though it comes down to checking all wiring to and from the ECU. If all are okay, then the ECU may well be the issue.
Getting there..... slowly 🖖
Yes indeed, the chronological ordering of the site is off sometimes...
As for my ER_01 code, I'm slowing going through the looming to see if any wiring needs attention 🖖
https://www.fjrforum.com/forum//index.php?showtopic=9612# <-- yep, some good info there... it's an electrical/wiring issue it seems - that's gotten me out of the blocks 😎👍