I've searched, and searched and i'm still a little confused, so many different answers.

Let's make this real simple for everybody who might search for the same thing after me.

1.Locate and disconnect the stock narrowband oxygen sensor, if your vehicle is an obd II system or above, replace the primary sensor. The primary sensor is located before the catalytic converter.

2 remove the narrowband sensor and install the wideband in its place

3. Red wire 12v source near ECU

4. Black Chassis ground near ECU

I need help with the rest... lol
i believe the other two wires get wired into D14.

I want the wideband in the car at all times, and i want to be able to datalog. I'm using a p06 converted to P28.

Also how did you guys wire your setup, so the wires aren't showing everywhere. I'd like a nice clean install

I'm not sure but resistors aren't needed when running a program like Crome, Uberdata, Neptune, etc... correct?

The noise capacitor should be installed where? Across the chassis ground and the 02 signal input, correct?

***I believe i purchased my ECU from 93turbo16, i was wondering for the switch you installed which direction is for open loop?


Modified by GiNuWiNe at 3:12 PM 3/17/2007

 

if you want to use the PLX as your full time o2 sensor then wire the grey wire into d14 (or whatever the o2 sensor input for the ecu is for your car).
But if you are tuning and want to datalog you'll need to switch to the white wire into d14 (the grey wire is the narrowband output signal and the white wire is the wideband output signal wire) select the PLX in the drop down box for which wideband you're using (in crome). You will also need to select the "disable o2 sensor (open loop)" diaglog box in crome to have the wideband (white wire) signal going into the ecu, otherwise the ecu won't know what to make of the 0-5v signal its seeing and prolly make ur car run crappy.
So for closed loop operation you need the grey wire hooked up, b/c that is the narrowband output signal wire for the PLX, this is so the ecu can read/interpret/use the 0-1v signal coming in from the PLX's o2 sensor.
But when tuning, (if you don't tune in open loop ur crazy) you need the white wire hooked up.

I used to have the 12V source for the PLX hooked up to my fuse box and it grounded to a bolt near the main relay(ish) area. Then have the d14 wire cut and a female connector on it coming from the ecu, and a male connector on both the white and grey wires of the plx unit, this made switching from the narrowband output to wideband output very easy.
All i did with the stock o2 sensor was leave it connected to the factory plug and zip tie it up in the shock tower area....this was so when i take the PLX out i can just pop the stock o2 in the exhaust.

 

https://honda-tech.com/zerothread?id=1585145

read this thread, pick option 1-4 and wire up the gray and white wires accordingly.

as far as the resistors, they are used to trick the ecu into still having a heated o2 sensor (which the plx isnt) that way you dont get a code 41. this can be bypassed if you use your tuning software to disable the heater, than you wont need to use the resistors.

 

So how would you install this with a obd2b-obd1 coversion harness. The harness doesn't have a wire for d14 i believe, i need to find a obdI pinout (ECU diagram). Do you cut directly coming off the old ecu plug or do you cut the conversion harness? Where do you tap for the power and 12v sources?

 

I got your PM this morning but couldn't respond, sorry.

There was another thread a while ago with this same thing. What EMS are you using?

I use the ELD input so I don't use D14 at all. My stock O2 is hooked into that like it would stock.

My power wire is hooked to the fusebox as this worked best for my car. I used a solid ground to the chassis for ground.

Wideband is hooked to the ELD input of the ECU. I do this because I have to bungs for O2 sensors. 1 for wideband and 1 for stock sensor. When I want to go to closed loop, I just turn it on in Neptune.

My car is OBD1 so as far as harnesses are concerned, I can't help you there but there should be a D14 as it will go into an OBD1 ECU. So determining the wires should be easy by looking at the ECU side of the harness.

I don't use resistors as I don't need too with the stock sensor.

 

power - a25
ground - a23
signal - d14

it would probably be easiest to tap the harness. you should be able to look on the ecu end of the harness to find the above locations. check this link for a obd1 ecu pinout https://honda-tech.com/zerothread?id=682412

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zman &raquo;</TD></TR><TR><TD CLASS="quote">if you want to use the PLX as your full time o2 sensor then wire the grey wire into d14 (or whatever the o2 sensor input for the ecu is for your car).
But if you are tuning and want to datalog you'll need to switch to the white wire into d14 (the grey wire is the narrowband output signal and the white wire is the wideband output signal wire) select the PLX in the drop down box for which wideband you're using (in crome). You will also need to select the "disable o2 sensor (open loop)" diaglog box in crome to have the wideband (white wire) signal going into the ecu, otherwise the ecu won't know what to make of the 0-5v signal its seeing and prolly make ur car run crappy.
So for closed loop operation you need the grey wire hooked up, b/c that is the narrowband output signal wire for the PLX, this is so the ecu can read/interpret/use the 0-1v signal coming in from the PLX's o2 sensor.
But when tuning, (if you don't tune in open loop ur crazy) you need the white wire hooked up.

I used to have the 12V source for the PLX hooked up to my fuse box and it grounded to a bolt near the main relay(ish) area. Then have the d14 wire cut and a female connector on it coming from the ecu, and a male connector on both the white and grey wires of the plx unit, this made switching from the narrowband output to wideband output very easy.
All i did with the stock o2 sensor was leave it connected to the factory plug and zip tie it up in the shock tower area....this was so when i take the PLX out i can just pop the stock o2 in the exhaust.</TD></TR></TABLE>

im kinda confused on this part... gray wire is for narrowband output signal and white wire is for wideband output signal... some people put a switch in place to go from white wire to gray wire. but when would you need to switch the wires and how come? I'm really lost to when you would need to switch the wires.

Use the white wire when your tuning and change to gray wire when your done tuning?

BTW i have 2 bung, 1 for the wideband and 1 for the o2 sensor. I leave the wideband in the car all the time and i want to datalog with hondata

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoOsTiN Dc2 &raquo;</TD></TR><TR><TD CLASS="quote">

im kinda confused on this part... gray wire is for narrowband output signal and white wire is for wideband output signal... some people put a switch in place to go from white wire to gray wire. but when would you need to switch the wires and how come? I'm really lost to when you would need to switch the wires.

Use the white wire when your tuning and change to gray wire when your done tuning?

BTW i have 2 bung, 1 for the wideband and 1 for the o2 sensor. I leave the wideband in the car all the time and i want to datalog with hondata</TD></TR></TABLE>

Only use the white wire for the wideband signal and put it on the ELD connection of the ECU (D10). Leave the stock O2 wiring like stock. Setup accordingly in Hondata (I assume you are using the S300 here...If not, this changes things).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ladysman &raquo;</TD></TR><TR><TD CLASS="quote">

Only use the white wire for the wideband signal and put it on the ELD connection of the ECU (D10). Leave the stock O2 wiring like stock. Setup accordingly in Hondata (I assume you are using the S300 here...If not, this changes things).</TD></TR></TABLE>

So hook up the white wire to the ELD connection D10 and dont touch the grey wire? How would things change if i use s200b?

 

Goto their website and down load the instructions.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoOsTiN Dc2 &raquo;</TD></TR><TR><TD CLASS="quote">

So hook up the white wire to the ELD connection D10 and dont touch the grey wire? How would things change if i use s200b?</TD></TR></TABLE>

S200 (with the old Rom Editor) can't use the ELD. Romeditor 4 I believe you can.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ubertec &raquo;</TD></TR><TR><TD CLASS="quote">Goto their website and down load the instructions.</TD></TR></TABLE>

i read it plenty of times... if i understand it i wouldnt of post here.

so white wire to the ELD connection... wat was all that about the white wire and gray wire to d14 then?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoOsTiN Dc2 &raquo;</TD></TR><TR><TD CLASS="quote">

i read it plenty of times... if i understand it i wouldnt of post here.

so white wire to the ELD connection... wat was all that about the white wire and gray wire to d14 then?</TD></TR></TABLE>

White wire to to the ELD connection. You must cut this wire at the ECU and connect to the white wire of the PLX&gt;

Grey wire isn't used here since you are using the stock O2

 

https://honda-tech.com/zerothread?id=1585145

4) Keep stock o2, datalogging.

This is the method I chose. It's basically the same as the one above, but my switch is connected to pin D14, the white wire from the plx unit, and the stock narrowband wire from the stock O2 sensor (which is also white). The grey wire from the plx unit is left unhooked.


I decided to test my luck and go without the capacitor that is supplied with the plx unit, I will probably end up putting it in eventually.

Here are some pictures of the finished install, I apologize for the small pics, photobucket sucks. If I fucked up somewhere in the writeup or if you have a better way of hooking this thing up, post it up

That one say hook up the white wire to D14 but you say connect it to ELD?

 

ok

When you are tuning, the ecu needs the wideband signal (white wire connected to d14) in order to datalog. This should be obvious.

When you tune, you tune in open loop, meaning there is no input from the stock 02 sensor.

When you are finished tuning, you typicaly set the ECU back in closed loop, this lets the stock 02 sensor report back to the ECU to keep the A/F steady at light throttle. Now, you can leave it in open loop and spend a bit of time making part throttle fuel perfect, but this is another topic so ignore this.

So after tuning, you set the car back in closed loop, the ECU needs the stock 02 sensor narrowband signal wired to pin d14 again (or the simulated stock signal "grey wire" from the plx)

This means you are going to need to switch between the wideband and narrowband wires that hook to pin d14.

Best way is to use a switch.

Im not familiar with the ELD wire the other guys are talking about.