DC2-ProdUcTiOnS

iTrader: (2)

So... Heres the deal...

I have a '96 Civic Hatchback.

Installing a '96 Spec JDM ITR

Got a EM1 99-00 Engine Harness to clip it all up.


So it seems that the EM1 harness will match up pretty much perfect with all the plugs connecting to motor sensors/plugs. EM1 is obviously OBD2B. (Will be missing secondary o2, CKF sensor... etc... I understand)

Car is originally OBD2A. Which means my dash harness doesnt have the 3rd plug for the ECU to control my speedometer and tach and such as required by OBD2B.

So what dash harness do i need to get so I can plug everything in correctly?

Is it this one???
http://www.ebay.com/itm/99-00-Honda-Civic-Upper-Instrument-dash-wire-harness-wiring-wires-speedometer-/230935977418?pt=Motors_Car_Truck_Parts_Accessories&hash=item35c4db5dca&vxp=mtr
This says UPPER harness and its manual. Difference between upper and lower?? I will not be using my A/C or climate control unit/module at all... So idc if any of that is hooked up. Seems this harness runs to gauge cluster, fuse box, climate control, air bags.

Give me a hand and let me know what I need to get to get this properly going.... I know the car will run and should be OK without this third plug as it seems to only control dash functions, but dont want to F anything up.

Thanks guys.

doctorake

Use the engine harness that came with the car or go grab one from an EX.

DC2-ProdUcTiOnS

iTrader: (2)

The engine harness that came with the car doesnt work on the JDM ITR motor. Hence why i bought the 99-00 EM1 harness.

doctorake

It should

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/92-00-honda-engine-swap-wiring-guide-vtec-non-vtec-2987229/

DC2-ProdUcTiOnS

iTrader: (2)

The EM1 harness connecting to the engine is not what im worried about... Its connecting the OBD2B plugs into the ECU...

My dash doesnt have the third plug to plug into the ECU.

So my question is, is the dash harness shown above the correct harness I need to change under my dash to get the 3rd plug for the ECU.

doctorake

That is why I said in the first post use the harness that came with the car or get an EX OBD2A harness. It will be far less work.

DC2-ProdUcTiOnS

iTrader: (2)

Swapping out the dash harness wont be that difficult of a task. Take out cluster and center console and a few panels and de-plug/re-plug everything. I would much rather do that then mess with cutting and soldering and moving and re-pinning wires.

EM1 harness matches pretty much right up with JDM ITR. Same if not better than EX harness. Which is why i have that.

Only problem is OBD2B harness. So if i get dash harness OBD2B as well, everything should be fine.

doctorake

Go for it, have yet to see someone complete a swap from OBD2A to OBD2B

kyden

not sure why you're so adverse to modifying your stock harness to work. A 96-98 EX harness would work a lot better than the si one you have. You would also not need to swap dash harnesses. Why not just use the right one from the beginning?

DC2-ProdUcTiOnS

iTrader: (2)

Is there a easy way to tell what kind of harness you have?? i can easily tell OBD1 or OBD2, but how to check DX HX LX EX?? I have two harness at home, but idt either of those are EX harnesses.

The one i tried to plug into the JDM ITR had a multiple plugs in wrong areas, not connecting, and not enough.

HondaPartsHero

Considering all are from manual cars the DX/CX/LX are the same and will have a 3 wire IACV plug instead of a two wire and no VTEC or knock wire. Also the primary and secondary 02 plugs will be close to each other. The EX will have a two wire IACV, VTEC and knock sensor connectors. The HX will be similar to the EX but will have additional wires for the EGR and a 5 wire 02. Just to name a few. Check out my connector guide

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/92-00-honda-acura-engine-wiring-sensor-connector-guide-3146770/

doctorake

HPH can you put all your articles that are useful in your sig the way grumble has?

Former User

Do we have them all in the FAQs sticky? Hero may need his own section there.

HondaPartsHero

Let me know and I can compile them, as for the sig I'm not sure how to add more lines as it only limits to 3?

DC2-ProdUcTiOnS

iTrader: (2)

HPH,

thanks for your help and better understanding though your write ups. I have since purchased a EX harness and anxiously awaiting its arrival.

If I am using the JDM P73 ECU which will plug directly into the EX harness, do i have to extended the secondary o2? JDM ECU will only be looking for (1) o2 sensor correct? Also the CKF sensor. There will be a plug for it on the EX harness, but I will not have a spot to plug it into on the engine. Should I do the bypass trick on the harness to rid this as well?

Im going to need to get the car to pass inspection through OBD2 scanner. So im assuming if i run clip connecters for second o2 sensor, I can plug in OBD2a ECU, and plug in second o2 sensor and with CKF trick performed, i should be able to pass scanner??
What ECU will work best for passing inspection with DOHC motor since EX harness is SOHC? Not sure on what ECU to use to not throw a ton of CEL.

Doctorake -

I apologize for the confusion. After reading through tons of write ups and articles I was mis-informed from the beginning on what harness to use. Was just trying not to have to buy another engine harness when i literally JUST got this one. again, apologies. Ive taken my whole dash apart in a different car and harness didnt seem too bad which is why I made previous suggestion.


Thanks for your guys help. Looking to get this thing running ASAP!!

HondaPartsHero

JDM ecu won't look for CKF or a secondary 02 so you won't have to wire either until you use the USDM then you'll need to bypass the CKF and extend the 02.

doctorake

No worries, glad you are doing it right.

This is correct.

DC2-ProdUcTiOnS

iTrader: (2)

What ECU should I use to pass emissions? USDM EX? The obd2a scanner is gonna have to read something!

Im guessing a USDM ITR 97-98 ECU? Like THOSE are easy to find... :facepalm:

DC2-ProdUcTiOnS

iTrader: (2)

also, just had a thought... What do i do with the EVAP plug thats mixed in with the injectors?? Where do i plug that in?

and if i leave unplugged, im assuming i will throw a CEL once I plug in a USDM ECU.

Help appreciated guys thanks

DC2-ProdUcTiOnS

iTrader: (2)

BUMP....

Tryin to figure out what ECU I will need to use to pass emissions once I install second o2 and do the CKF bypass.

doctorake

I am guessing a USDM ITR one. States vary though so you would have to state which one you are in.

doctorake

Not sure if the ITR ECU will look for the FTP sensor also, the only way around this for emissions is to install one, unless your state allows some OBD monitors to be not ready then you can trick it into not throwing a CEL using a potentiometer, but the monitor will never come online.

DC2-ProdUcTiOnS

iTrader: (2)

Im in NY...

Finding a 97-98 USDM ITR ECU is going to be near impossible. Im wondering if a 96-97-98 GSR ECU will work. Only difference I can think is the IAB. But idk if that would throw a code or not? hmmm.

doctorake

Honestly I do not know if they would work or not. Can you use an OBD2B ITR ECU with a jumper to OBD2A?

DC2-ProdUcTiOnS

iTrader: (2)

actually... P2P (EX ECU) should run it fine as long as im not beating on it. All sensors/ plugs would be the same except for CKF and secondary o2.

I would have to make sure my EVAP lines were all plugged in and reading, but other than that, i believe the SOHC will run the car, it might just run like crap for the day while i get it inspected.

hmmmmmm...... input?