[DukeofSeven]

Quick! B4 anybody notices! Dear Gawwwwd, post the year/make/model !!!

[also, please show the entire page of the wiring diagram, and show the list on the page after the diagram -- the one that indicates what the module/components on the diagram page are]

 

[DukeofSeven]

Fascinating.

haven't gotta clue.

kinda funny it's grouped right next to the diagnostic 4-pin connector on the diagram, though.

the ye-bu shows up in multiple locations as a low reference circuit for the EFI ctrl unit... but i have no idea what to tell you beyond that. well -- nothing except for, if it's nunna yuh business, don't poke it, don't probe it, don't try to romance it in any way that might let the smoke out.

but i'm sure if anybody knows what purpose it serves, they'll eventually show back up here.

is it important? or did you sorta just get bored for a moment and trip over the keyboard?