Good evening sir! I believe that you have a few posts regarding this issue. I responded to one of them (1990 4.0 4WD Starting). While my vehicle is four years newer, the info I posted there may help you. On my truck (OBD1) here is where and what the plug looks like. It may help you. Also, there are very good YouTube videos that can show you how to read your codes.
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1994 Ford Ranger XLT Extended Cab
2WD Automatic
4.0 V6 OHV
MODS: LED Dashlights, Wired for OHC (don't have the guts to cut the headliner), Lighted Visors, Auto-Dim/Mirror, Auto Headlights, other than that it's pretty much stock
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