JDM P72 Help!

sohcd16y8 · Post by **sohcd16y8** » Mon Dec 29, 2008 9:09 pm

Does anyone know for sure if an OBD-1 JDM P72 ECU sends a ground signal for the IAB's liek the USDM ecu, or a +12V signal like the OBD-2 ecu's? I keep reading mixed info when I search. Thanks

relic1 · Post by **relic1** » Tue Dec 30, 2008 1:35 am

depends on the year of the P72. some were 12V active, some were ground active. I've seen both, yes it's a minor headache. I've never really dug into what years are what, or what versions are what. It's easy to tell what's what once it's plugged into a car.

sohcd16y8 · Post by **sohcd16y8** » Tue Dec 30, 2008 1:40 am

Crap, Idk what year it is. I guess I will just wire it assuming that it sends +12v, that way if it sends ground it just wont do anything, rather than risk the solenoid having 12 on both sides. Anyone else know for sure?

relic1 · Post by **relic1** » Tue Dec 30, 2008 1:57 pm

either way you wire it, if it activates the other way... it will do nothing. No harm will come to it if it has 12V on both sides.

RoadXY · Post by **RoadXY** » Tue Dec 30, 2008 4:02 pm

Electronics work on power difference. The difference of two time 12v is none