I was doing a search on here because I wanted to learn more about Fatory honda ECUs. I dont care a ton, because I'm running a standalone, but I wanted to be informed in case someone asked me.
My question is based on the fact that I went to a website, and saw "P28" and then next to it "OBD1 92-95 civic si/ex" those are both D-series motors, but whenever you hear about ecu's, you always hear about P28 ECUs. so I was wondering if you can indeed use this D series ECU with a B series motor, without problems, and also, that implies that the same can be said about wiring harnesses?
thanks for the help
-Mike

 

Yes, the pin outs are the same. Except the P28 does not use the Knock Sensor nor control the secondary butterflies. So, if you have a B-series motor without a dual plane manifold you should be able to run a P28 or P30 without any problems.

 

you also need to get it chipped for dohc

 

I don't know anybody that doesn't run a B-Series with a chipped P28