I just finished doin a b16 swap into my 1990 integra, and everything seems to be good except for i get a map sensor code 3 on my computer. Anyone have any idea what could be wrong? I tried changing the map sensor with another used one as well as put my pr4 ecu back in just to see if i was getting power at the sensor....but nothing. I'm really stumped, i think it may be a ground problem beacuse i get a reference voltage of 5 volts at the ecu, (c15). Any of you experts out there have an idea whatthis is letme know please.

thanks in advance