1guido wrote:Does anyone have the wiring diagram for a 06 escape 3.0 , specifically the wiring diagram for the obd II connector. I am trying to figure out where pin 5 of the obd II which is the signal ground originates from. Its a black wire with a yellow tracer.
Thanks for your help
tomw wrote:WPTSKI said:
If it's a signal ground or a return path, it's a floating ground and should originate at/from the PCM.
Okeydoke. What does "floating ground" mean?
My impression is that a signal ground is a more direct way to have a 'common' ground point, with similar resistance, save wire resistance, to a ground plane as the CPU sees. If you were to ground computer parts to individual grounds on a ship, as I had experience with, you ran the risk of having a 'ground loop' whereby the 'ground' at the cpu was different from the 'ground' at the tape units or printer. Just the difference in resistance caused by the path length and other variables could induce currents that were not desired.
Do you mean that the floating ground is not connected anywhere to the chassis ground? That would leave it 'floating' with respect to chassis ground, but leave it susceptible to bad stuff happening if it WERE to become 'ground' for something undesired. If you lost headlight ground, and there was a signal ground handy, the current through that signal ground could fiddle with 'stuff', no?
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