EDIT****** just saw another post of yours refernecing a D2... if that is the same rig you are asking about then I am not positive... the below info is for the older D1 plugs***
If you're talking about the plug into the back of the IACV???? then yes (and no).
It only goes on one way... the four pins represent two seperate circuits. You should notice an allignment notch on the plug end pins and a slot on the plastic pin guides of the socket?
What year BTW?