How do you remove the engine wiring harness from an obdII chassis? Is it very difficult?

 

just unplug from sensors and pull away.

 

The one in my '97 cx is battered... the previous owner weas a idiot when it came to wiring and tore it up. I want to replace it, swo I need to pull it out of the firewall alltogether

 

where all is it connected in the firewall? i.e., how would I replace the harness on an OBDII civic?

 

disconnect the ecu and near the ecu there is also a plug that connects it
to the chassis harness. unplug that and pull the harness into the engine bay

 

so it's not a huge involved process, and I could replace the engine wiring harness without getting into the dash and undoing all those plugs?

 

right, just 4 plugs under the dash and you can then remove the engine harness
easily.

 

cool.. this leads to my next question... a little more specific to my problem though... maybe you can help me out.

I've got a '97 civic cx with an OBDI h22 in it. Could I just plug an obdII prelude wiring harness into the civic chassis and plug everything up to the motor, and then getn an OBDII-OBDI adapter harness to run the OBDI prelude ecu and have it all work? This would also elimintate adding any wires for my h22 swap.

 

No, the problem lies in the fact that the 96-01 civic uses a one piece engine/ecu
harness unlike the prelude/accord/integra which is two piece.
My suggestion would be to find a 99-01 civic si/EX harness and extend the
necessary wires and then use the harness adapter to use the older ecu.

 

96-98 civic engine harness is different than the 99-00 harness. The thing that is different is the connectors to the ECU. You might be ok if your going to get an adapter harness and use an OBD1 ECU. I dont know for sure, so i just wanted to let you know.


-Ace

 

yes, it would be best to use a 96-98 harness because there is a SMALL wiring
different in the underdash harness plug. nothing major, but less work to do.

 

Is this 4th plug green? If so, the green one in my car has wires from it going to the ECU plugs (from the person who originally did the obdI conversion by hand). Will this get replaced witha new harness too so that I can start anew with full OBDII?

 

^^

 

anyone?

 

True, but could you figure out how to rewire it? I sure couldn't. The green connector is what threw me off.....

 

are you saying you'd have to re-wire a 96-98 harness of my 97 civic? Tell me about this green connector

 

^^^