TheRedEM1

im about to do a b20b non vtec swap in my 2000 civic ex and i just baught an ls obd2 ecu and only two of the ecu pulgs actually plug in except for one. do i have to get a conversion harness for it or what? im not sure what to do about that so any hlep will be greatly appreciated

90Rexx

search.... you need a 96-98 engine harness.... your 99-00 chassis uses a different wiring plan than the 96-98 which shares the same wiring plan as the integras which is where your computer came from ;-)

JShull

Sounds like you picked up an OBD2a ecu. You need to get the correct ecu or a chipped one with the correct maps for the B20 anyway. Why not get a chipped obd1 ecu with a jumper harness and the correct maps so you can do it right.

Also, just reuse your stock harness that is in the car. You can't reuse the harness from an Integra as suggested b/c it plugs in at the shock towers where yours goes to the ecu directly.

Just get a obd2b to obd1 jumper harness and a chipped obd1 ecu and you will be good to go.

TheRedEM1

yeah im more than likely going to have to convert to obd1. if i convert to obd1 will a stock ls ecu be ok for my b20 im not really going to rag on it im just trying to daily drive it.

JShull

Just get a chipped one man. It will save headache. The maps between the ls and crv motor are different. There is a .2 liter difference in displacement.

TheRedEM1

would i be able to chip an obd1 p75?

Shimakid12

iTrader: (2)

Yes you will be able to have an obd1 P75 socketed, and then have a basemap chip written for the b20b. The chip can then be inserted into the socketed obd1 P75 and you should be good to go. The only thing you would need then is an OBD2B (99-2000 civic) to OBD1 conversion harness to plug the P75 into your car. You can go to Pherable.net for more info on it, and you can send in your ecu to have it done for you. Or you could search around some more to find other place to do it.

TheRedEM1

ok i appreciate the help. for now that sounds like a good idea, but it is my daily driver and later on i would like to have it obd2 for emissions. what would be the best way of converting it back to obd2.