I just got a 93 LS integra, I knew before that OBD’s followed civic years (92-95 obd1) So I assumed it the car was OBD1. Pulled up the carpet to check the ECU last night just to see what was in there, and its a PR4. I was expecting to see a P75? So I came online this morning and checked out the ECU codes and what car they come in, as well as respected OBD for that ECU. Going by phearable.net’s list, he has pr4 as obd0 for 90-93 ls/gs, and pr4 for obd2 for 96-99 ls/gs. So after that I did a little more digging and I see people talking about a pr4 being OBD1. So at this point I had to put this out and get some real input. Not that it matters SO much at this point, I was just hoping for OBD1 and wanted reassured that pr4 was obd1, or maybe there were versions for all 3 obd periods? Thanks for any input
hey man my 91 rs is running on a pr4 -old style obd0 black and tan connectors
but i swapped a 93 b18a into a civic hatch and the ecu i got out of that car was also a pr4 but it is obd1 cause it has the gray connectors
i also ran the same car on a p75 out of a 95 teg also gray connectors
look at your ecu connectors and you should be able to tell what generation you have
if i am not mistaken the black and tan connectors are obd0
and all three gray connectors is obd1 or 2
Thats the kind of evidence I was leaving out, it definately has 3 grey plugs. And there is no resistor box under the hood, so I figured it was OBD1 like its supposed to be, but you never know what some people do to these poor cars lol. Thanks for the info
there is a obd0 pr4 and a obd1 pr4. you have a obd1 pr4. the car is a 93 making it obd1.