i have a problem i put in a B18A1 in my friends 94 civic DX coupe, and i used a harness that he said was already modified for the motor and will work on his civic, but it has so many wiring problems i am not even gonna try to trouble shoot it i have tried to because it had 14,41,10,and 8 cel. and i replaced and diognosed all the codes and they never cleared even resetting the ECM as many times aas i have they will not clear so the pin lay out on the cores must be off big time so i am gonna just put on the DX harness and modify that one to work with a B18A1 but i need to know what i need to add or switch to make this harness compatible for a B18, so any info and suggestions would be nice, and u guys can give me the pin lay outs if u want i am using a P75 am or aw ECM, but i really need to know what to modify. i tried using mitchell on demand at my college but could no find a good enough wiring diagram to read what to change and they looked very similar.

 

B18A1 is supposed to have a PR4 ECU. I am not sure how they pinouts differ, but if he is using the Integra engine harness it should be ok, as long as it is plugged into a PR4. I can check my helm's for the two if you want to repin the Civic harness.

 

If you use your DX harness then I think all you would need to do is rewire your O2 sensor because you spot for it should be at the end of the B Series header and no on the manifold like the D Series has it. There might be one other wire you will need to extend put I am not sure. For the most part, your DX harness will work with you B18A1. As for ECUs, you will need a PR4 from a 92-93 Integra or a P75 from a 94-95 Integra.

 

yeah i believe the pr4 is obd0 and i did not want to convert obd1 to obdo so i went with a P75 which to me is just fine i hope everything works out if anyone has any more experience please help this is my first B18 swap i have done many other swaps with 90 hatch's usually ZC swaps or B16 but not a B18 the harness look totally similar so i am hoping they will work but the pin layout i think is still different?

 

today i am switching the harness so any more info will be great because it will make my work a whole lot easier.