Spooner6

98 jdm b16a sir II swap using a 98 ex harness and a 99-00 si ecu

Do I need to extend the 2nd o2 from the ex harness? Where is it located? Ty newbie here.

HondaPartsHero

The secondary 02 is in the cabin harness that runs to the catalytic location under the car. However if he was using an OBD1 ECU it won't look for one and generally you can leave it in the same place as long as the header lines up to the stock exhaust.

tony_2018

Why would he need to extend it, when his ex model already has the o2 in the cat converter?

B serious

iTrader: (1)

Primary O2 needs to be extended. Not secondary.

OP....take it to a shop if you're uncomfortable with wiring.

For it to run, you'll need to rewire the distributor or get a distributor jumper. You'll also need to lengthen the primary O2 wires. The rest plugs in. You don't re-pin sandwich harnesses. The whole point of them is to be plug and play. But.....they're very fragile. So don't yank on the wires.

Spooner6

Ty guys lets give u my set up run down I have a 98 dx hatch with no 2nd o2 in the cabin correct?

I Doing a 98 jdm b16a sir II Swap Useing the 98ex harness Running that harness to a 99-00 si ecu

So far everything was plug n play now I have 3 plugs left over n don't kno where they go lol ��

?questions r is this plug for the crank sensor?



Plug next to injectors

Spooner6

Srry for the ugly pic I'm total newbie. Can't even navigate the site. �� Anyways

Here's the 2plug under the manifold







Is that's 2nd o2. Tat goes to the catalytic converter that I extend ???
Or. Do I do that or pin that out on da p2t si ecu

Spooner6

Last but not least. The plug next to the disturber





Ty guys

Spooner6

With all that said do I still need a jumper from odb2a harness to a odb2b ecu ���� Lil lost


And yes I am trying to get it bard n legit for my dd Any guidance is much luv n appreciate. Ty guys

HondaPartsHero

HondaPartsHero

That looks like the CKF, you'll have to bypass it.

HondaPartsHero

Could be either fan switch or ECT, post wire colors

Spooner6

Ty hero. Yep I think ur right the first 1 goes to purge nxt to injectors on the fuel rails I was missing that.

Second plugs has to b crank sensor Yep have to do by pass

Third plug. Is I still don't kno lol. I bout si harness to help me out n that don't have it either
Hmmm Don't think it's fan. Will double check on that tho. Will post colors ASAP on that. Srry been Mia Holliday run arounds.

Again Ty guys Ty hero ur my hero. ��

HondaPartsHero

https://honda-tech.com/honda-civic-d...guide-3146770/

tony_2018

If you can get the color code of those wires from each plug, but the 3 pin wire near the alternator could be the crank sensor plug, the 2 pin looks like the oil pressure sensor plug for the vtec solenoid, but since jdm motors don't have that and only have the vtec solenoid you might need to ground it.

Spooner6

Ok had the plug next to the cap is. Colored black / blue with black ?



N yes the plug under the manifold is for the crank sensor. So do I just clip it off and hide it.

Spooner6

Also do I do the ckf bypass on my ex harness?
I'm ordering a jumper on Monday hope there's a sale lol
Or do I do it on the jumper cuz I am running it into a 99-00 si ecu.
I kno I still need to tap splice my wires to make my o2 that goes to the catalytic converter.
I my question is I'm doing all this tapping n splicing on my ex harness correct???
N just plug that into the jumper. Then to the ecu ???

Thanks guys.

Spooner6

Tony u may right. U just reviewed the page that u had provided (hero) black/blue-black is oil pressure So just ground the black. N leave the blue-black clipped n tuck. U say tony?

HondaPartsHero

Yes bypass the CKF
.:FFS TechNet : CKF Bypass Trick :.

Pressure switch bypass, tap b12 with c10 On your jumper side harness


Wire up secondary 02
.:FFS TechNet:. » ECU & WIRING » OBD2 2nd 02 Sensor Wiring

Then use your ECU jumper

Spooner6

Ty hero. So. All of my tap n splice are all done on the jumper correct!? And not my ex harness. N follow the ecu guide for obd2b correct?







Here's is a pic of my ex harness running into the 99-00si ecu. The jumper will let me have all 3 plugs plug in then do my tap n splice right???? ��

tony_2018

Your ex model should already have the secondary o2 sensor there, that is why I keep telling you its not needed. As someone stated you might be confusing the primary o2 as the secondary o2, that needs to be extended behind the engine.

For any b-series the primary sits behind the engine, for the D-series the primary sits in front of the engine.

Spooner6

Hmmm 98civic dx hatchback is my model

I am using a ex engine bay harness

So for the confusion. Tony. Thought I have gave u guys that info. Already on my run down set up.

tony_2018

Than your title is all wrong and you didn't give enough details.

Spooner6

98civic dx hatchback. Swapping a 96-98 sir 2 jdm b16a /obd2

Using a 96-98 civic ex engine harness.

Running into pt2 99-00 si ecu.

Tat is my set up. Tony

HondaPartsHero

Yeah you'll basically plug your harness into the adapter and then plug that into the si ECU

Spooner6

sorry I just looked it up and tagged on to it. Sorry for the confusion guys I'm still noobie trying to navigate around n use the site. My apology tony. Again sorry

And thanks for all of the luv guys