Glad you figured this out Kero, it's good to see someone who actually does the research and looks into their problems thoroughly to figure it out mostly by themselves with a little guidance.
Originally Posted by kero
Amazing just how connected things are these days on cars, even a simple brake switch, going bad can cause the TCU to get testy.
I really really dislike the inefficiencies and the enormous amount of crap that today's vehicular computers will go crazy over. I like my OBDI Legacy where the CEL is only tripped if there is complete failure within a sensor or circuit. I double like my 1984 BRAT where there is almost no electronics.
Electronics = PITA