Torleif

Hi!

I have a 96 civic ej9 with a b16b swap and a ek9 ecu. Both the engine and the ecu are obd2b, but the stock chassis harness is obd2a.
My question is, will the stock obd2a harness communicate with a obd2b engine harness? Or do i have to use a obd2a engine harness and a obd2a to obd2b jumper for the ecu?

Have been searching for an answer to this but with no luck. But maybe someone here knows?

DumpdEJ6

i believe you will have to use a jumper, if I'm not mistaken there is a whole plug on OBD2A that isn't used on OBD2B.

tony_2018

What obd2a harness are we talking about, specifically what I put in bold

Moi Moi

I been loking for a obd2b pct ecu... i have what you need pct obd2a... if you want to trade send me a pm... and yes you need a obd2a engine harnes

Moi Moi

You can buy a obd2a ex harness... and plug and play.. with a obd2a ecu

Torleif

The harness that is under the dash that goes to the speedo etc..

Torleif

That would be a great deal, but i live in Norway so a little difficult to do.

98EGY8

^this or get obd2a ecu instead of jumper, which ever is cheaper. and as Moi Moi mentioned, youll want a 96-98 mt ex harness

Torleif

I have read that you can use a auto harness, just don't use the auto plugs. Is that possible? They are much cheaper than mt harness.

HondaPartsHero

I don't believe he's in the US if he has an EJ9. You'll need then engine harness for whatever engine in your country uses a B series VTEC that is OBD2A. I don't believe anyone makes a jumper harness for your ECU as it only uses 2 plugs instead of the usual 3.

tony_2018

Would be nice if they state that fact.