case ground?

[73stallion]

i finally got the chance to put a snap on scanner on the explorer today, it came back and said it has a CASE GROUND problem. where is this case ground located? it's triggering different check engine codes. i'm trying not to put any money into this thing because i want to sell it.

 

[mbruffey]

Old thread. But my case ground shows negative. Have not found any good information on it yet. Keep looking.