Hey guys, I'm new to the forum.
I have a 1996 civic coupe with d16y8 swap from a 99 civic.
the motor has the 99 harness on it right now and the guy just connected it to the 1996 ECU.
The speedometer & rpm is not working but the fuel gauge and temperature gauge are working.
It's also throwing a check engine light but I don't have a reader to get the code.
The guy says that I need to get a 1996 wiring harness and connect it to the 1996 ECU.
I'm thinking I can just get a 1999 ecu and plug it in to the 1999 harness that's in there right now.
Will a 1999 ecu work on 1996 shell?
Also, if not, can i just get the 1996 wiring harness?
Will everything work right with a 1996 harness & 1996 ECU on a 1999 d16y8?
someone please help, I have someone willing to come and install the harness. i just don't know if i should order it because I don't know if it would work on a 1999 motor.
Thanks!!

 

So you have a 99 motor and harness, with a 96 ECU? The harness plug actually go into the ECU? I was under the impression that OBD2a (96-98) and OBD2b (99-00), had different plugs altogether. I dunno.

Get a 99-00 (OBD2b) ECU and you should be fine. ECU is easier to swap out. If there is actually nothing wrong with the sensors, the correct ECU for the harness you have should fix that.

 

If i decide to go with swapping out the 99 wiring harness, and putting a 96 wiring harness in the car, with a 96 computer, will it work?

 

You might have a few sensors that might not plug up due to the differences between obd2a and odb2b. I would look to see if there is information out there about it. I am sure there is. Look around on google, or honda-tech.com.

 

Hi i did the same thing to mine to passed emissions.. i got a 96 hatch with a 00si motor swap.. i had to swap out my whole dash harness and floor harness to a 99-00 to work with a 99-00 engine harness.. its may sound like alot of work but actually not lol well maybe for mehahaha

since you got a sohc u can still use ur 96-98 ecu just make sure its an ex and manual

 

might just be a broken cluster.. you might wanna check that out before you do anything