Okay, I've been researching this for a while and can't find a definitive answer. So my question is what year and OBD are these following ECUs:
PR4
P74
P75

I thought the PR4 was strictly an OBD0 ECU for the 2nd gen integra, but I came across some threads/posts mentioning an OBD1 PR4. If they come in both OBD verisons, is there a way I can tell which one I have? The reason I am asking is because I am planning to do a swap and I would like to have it BAR'd so I want to make sure I have all the correct parts. The motor is a B18A1 and it's going into an OBD1 Civic (1994). Also, what is the difference between the P74/P75 as those are both mentioned as OBD1 ECUs. Thanks in advance.


Modified by 24TEN at 3:44 PM 6/23/2006

 

before i go home from work bump

would like to know please. thanks in advance!

 

bump

no one know how to tell the difference?

 

what year is that motor? b18a1 came in 90-93 integra only (i think) and your car is a 94?

 

Correct, the issue is that it seems that the 2nd gen integra has both OBD0 (90-91) and OBD1 (92-93) versions while still using the label PR4 for the ECU. So my direct question is, is there a way to differentiate an OBD0 PR4 from an OBD1 PR4?

 

you cant ref a motor older than your car. The motor must be same year or newer to work

 

Correct again, but I just wanna know what I have. The original owner says it was out of a 93, but the throttle body looks like it's an OBD0 (missing a sensor) which is why I'm uncertain of what I really have.

 

1990-1993 integra's were pr4's. 90-91 was obd 0 pr4, while the 92-93 was obd1 pr4. In 94, it changed to obd1 p74, and in 95 it became obd1 p75. 96+ is obd2 p75

look here for pics of what obd 0, obd1, obd2A, and obd2B ecu's look like
http://hondata.com/techecuid.html

 

BAM!!! that's what i needed right there!!! thanks bro, it's really appreciated!!!!!!