I cant find a listing of all the pins but I think they are on this page.
http://chromedecu.org/?cat=46
nope, the 4th plug is for the extra connections available with the flash ECU as stated on the site I linked
Stock 1G VR4 ecus have three plugs. There are 4 plugs on the 1G PNP Flash Ecu.
The 4th plug is a gray 12 position plug (included) for all the extras inputs and outputs the Flash ecu offers. You can just plug the stock three plugs in the PNP Flash Ecu and your car will start and run fine. To use the flash pin (51 on 91-93 PNP Flash Ecus), WBO2 logging, boost logging, ect. you will have to wire them up.



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