Forgiven

Can I use my LS wiring harness for a JDM B20? It's for a 94 Integra if that will help any. Thanks in advance.

chidoks

yup..

Newman

Yes, but you also realize that the B20 is an OBD-2 motor so unless you swap over all of the misc parts & sensors (distributor, injectors, alternator, etc), it won't plug into your car. Just swap the longblock only and reuse the Integra LS parts so it all plugs right in.

Forgiven

Very helpful info, thank you.

Trey

If the car is OBDI and the ecu is OBDI then an OBDII block doesn't matter.

Yes it has a few extra sensors but just leave them alone.

The ecu isn't looking for that signal.

ivan93egreppin210

sorry for the five year old bump but i searched before i posted and this thread seems to be the most helpful so far. im putting a usdm 2000 b20z2 in my 94 ls integra. im reusing my alternator, dizzy and intake mani. if i use my old harness, will it bolt right up? do i leave my old injectors on the mani? the harness that came with the motor doesnt have a break in it. it goes from the ecu stait to the motor with no break in between. the guy above says i dont need to wire the knock sensor. is that correct? what othe sensors are affected buy using the old harness?

AngelTeg

ya, he is right just dont worry about the knock sensor. You're going to want to use the harness from your Integra, because the Harness from your B20Z is OBD2 and will not pluf into your Integra's ECU, since it is OBD1.

Just use the harness that is on the LS. Plug in all the stuff that plugs in and you'll be fine. the B20 engine is gonna have a few more sensors than your Harness has plugs, but dont worry about it, as was previously stated, your ECU isnt going to be looking for anything that isnt on the harness.