hey all i've allready searched this and have looked at my chiltons and i still can't figure out what wire is which... lets see this is what i have

orange+ blue at ecu pinout c18 is green and white wires on 4 wire o2
orange+ black at ecu a16 and black at 02
and the other black is yellow black to switched power... ok so this is switched power
but what are the others

is white and green on the o2 sensor the signal to the ecu? if so why do i have my odb0-odb1 harness conversion wired to seperate wires
i'll scan the schematic later and post. please help it's a p28 ecu and universal o2 sensor w/ (grey 2 whites and a black)