Dukie432

I just finished dropping a 2000 type r motor in a 94 civic dx. I went ahead and used my obd1 wiring harness so I can use my chipped ecu as well as my type r is jdm so it wouldn't work anyways but my question is I have everything hooked up to my wire harness except the o2 sensor. It's on the bottom of my headers. What do I plug it into to make it work. Did I leave something on the old motor. I still have the old motor if that's the case. Is there a way to manually wire it to the ecu? This is the only thing stopping me from getting this car on the streets. Every piece of advise helps

Dukie432

Anybody done this swap before

Dukie432

Anyone?

98civdx

you plug it in to the o2 sensor,
did you even try and search i mean come on its a o2 sensor plug,,,plug it in to the o2 sensor!

Dukie432

I did try searching for it. I can't find it anywhere. Me and a couple buddies are stumpped

DC2-ProdUcTiOnS

iTrader: (2)

its a square 4 pin plug...you cant miss it...its generally on the left side of the engine bay if your standing in front of the car...try crawling under the car and see if you can see any harness connections that you missed...i just found mine on the JDM ITR swap i just picked up....it only had 1 wire into it...lol....

Dukie432

I'll have to try that. Was that on your jdm harness? I'm using the Dx harness and I didn't see anything on the passenger side but I could be wrong

sde780

Don't they have two O2 sensors? You only need one if you're OBD1 I believe.

Dukie432

is this true?

civic_driver

It depends on the ECU used. I think the correct ECU for this engine is OBD2 and requires two O2 sensors (one by the header and one after the catalytic converter) but there are people running with chipped OBD1 ECUs and require only a single O2 sensor.

Dukie432

I'm running a chipped obd1 ecu on this motor. Should I use the o2 from the header? And where is the plug on my harness, I can't find it anywhere. As far as I can see every plug is accounted for and plugged in except for a white plug behind the throttle, I believe it's my knock sensor, but I don't need it sense I had it removed when I chipped the edu. Any ideas or pictures of the plug that the o2 sensor goes into on the harness

civic_driver

Yes, from the header.

Either that or the IAT sensor.

As you can see in this picture: http://i76.photobucket.com/albums/j2...Picture092.jpg the O2 sensor comes out of the header and the wiring goes by the transmission. The plug should be there somewhere.

You can always hardwire the O2 sensor straight to the ECU if you know which pins on the ECU attach to which wires on the O2 sensor. It's not that hard. Just find a pinout for your ECU and take it from there.

Dukie432

I'll have to check on my old motor if that's what I'm missing. Any idea where I can find that pinout online. Have u ever heard of someone manually wiring it. I asked a couple people and they looked at me like I'm crazy

civic_driver

I'll try to find something. Which ECU are you using?

I know it can be done (when you remove all those plugs from the wiring harness it's just a bunch of wires that are wired to the ECU anyway). When you hardwire it, basically, you're losing the plugs and if you need to change the O2 sensor you would have to resolder the new O2 sensor wires again, instead of simply unplugging/plugging the new O2 sensor in (actually, some O2 sensors already require that you solder new connections--they don't come with plugs).

And yes, I've heard of people doing it, don't mind your crazy friends

Edit: Another thing you can try doing is once you find out where on the ECU the O2 sensor wires connect, you can try pulling on them and see if any wires move in the engine compartment somewhere around the transmission area.

Dukie432

I'll try looking again tommarow but I have a p06 but I sent it into pherable and got it chipped

civic_driver

Here it is: http://www.dodo-upgrades.nl/pinoutp06p28p30.htm

Just would like to say, I don't know how accurate it is.

Dukie432

that was very useful my next question would be, do I need to make all 4 wires connect to d14 or single it down to 1 wire then connect it to d14?

civic_driver

You connect the O2 sensor signal wire to PO2S/D14 on the ECU. Then connect the O2 sensor heater wire to PO2H/A6 (either heater wire). Then connect the other two wires to chasis ground (I think).

Btw, I just noticed that the ECU pinout I linked to is for European ECUs. I don't know if the US ECU pinouts are the same (they should be for the most part).

98civdx

yes this is correct.
on obd1 you only need the primary.

Dukie432

Ok. Is there a way to know which wires go to ground and which one is heater wire and regular o2 sensor wire

civic_driver

If your sensor is aftermarket it has to come with instructions on which wire is which or look it up on the internet for the wiring configuration.

Dukie432

Ok. They r stock sensors, I'll check my Honda manual. Also I have never messed with wiring before but I know how to sauder. How do I actually connect it to the ecu. Am I tapping into the plug or the actual ecu?

MonkeyMagic

extend harness from header to front of motor where stock obd1 o2 plugs in

(i really didn't read the thread)

Dukie432

It's alright that u didn't read it u might have gave me a second option. I have to find the plug from the original motor and extend and if that don't work then I'll have to figure it out manually wiring it. I still kinda need help on that cause I have to wire in my vtec somehow

MonkeyMagic

extend the stock plug... should be dangling under the distributor.

wiring it to the ecu is a pain, usually leaves most noobs with a cel for o2s heater.

i'm here for you blue!