So swapped in a b20 this weekend she is running right now on a p2t. I had bought what I thought was a good ECU (p75)but it would not Prime the fuel pump in the car. it would crank it but nothing more than that. I would ideally like to run the p75.

My guess is its just a bad ecu and the guy is a douche who sold it? Idk maybe I did something wrong? Lol

Any help would be greatly appreciated!! Thank you for your time

Bullet points:
Jdm b20b obd2b
2000 si
B16 harrness odb2a

 

You have to repin a16 to a15 on the ECU plug. (.:FFS TechNet : OBD2b ECU Connector Schematics :.) The fuel pump relay wire is in different locations on the chassis from ek to dc.

If your p75 is an USDM version it also has an immobilizer that will need to be removed or bypassed. It is likely a good ecu, your current wiring is the problem.

If you simply remove the immobilizer you will have a check engine light that will not go away but does not affect performance. You can contact Katman at JHPUSA and he will replace the immobilizer with a bypass chip and no check light.

The easiest fix for you is a 99-00 CRV 5-speed ECU, plug and play no hassle, no immobilizer. car-part.com nationwide junkyard search. They go for as low as $60 +shipping if they aren't nearby.

 

obd2b ecu or obd2a ecu? Conversion harness? Why did you not use the obd2b em1 engine harness?

 

Thanks that's what I needed to know.

 

It's a 2a ecu with a 2a harness. The car came with a obd2a b16 harness

 

So we repinned the p75 ecu(obd2a) fuel pump relay from a16 to a15. The fuel pump did prime but it wouldnt start.
When the fuel pump wire is in the original location(a16) the car will start plugged into the stock p2t ecu and an obd1 Mad Fab Lab Ecu jumped to obd2a

Any ideas on why the p75 still wont work??? I would like to run that because I've read that crv ecu's tend to run a little lean... worst comes to worst i run the crv ecu no big deal. Im just curious to what else it could be. Thanks for any help

 

Also would like to add the p75 is from a 97 ls so there is no immobilizer

 

You can go old school, run the crv ecu and an adjustable fuel pressure regulator tune with a wideband. It worked for many many people for a long time.

 

You sir, are awesome. Haha, thank you for all the knowledge!

 

Ok so I found this thread in a google search so I dusted off the old username haha

i am having this exact problem. Car runs mint on my chipped obd1 ecu. I looked at my conversion harness and both of the ecu pins referenced here are spliced. Should I cut the one for the integra? Thank you!