hi i did a b-swap into my 92 4 door civic and bought the plx300 wideband a/f monitor... i just wanted to know if anyone could tell me where to wire the gray and white wires to the ecm so i can replace my stock o2 sensor.. or send me a link to the entire procedure...the instructions included were 1 paper and they suck... thanks

 

bump, b/c I want to know

 

bump

 

Go to Pin D14 on your wiring harness. It's a white one. Strip some the white wire on your ECU harness and strip some of the gray wire from your PLX system. Sodder the two of them together.

If you arn't using a program like uber that allows you to disable your O2 heater, you will need to loop your heater lead w/ the heater ground. I'll look that up when I have time.

But run your PLX lead and grounds near your ECUs lead and ground, wire the grey wire into pin D14, disable or loop O2 heater.

 

thanks dude ive posted this in like 5 forums and ur the only person that will give me a str8 answer on gray wire to what/ white wire to what...yea if u find out what the other wire goes to that be great thanks again

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmspecb18 &raquo;</TD></TR><TR><TD CLASS="quote">thanks dude ive posted this in like 5 forums and ur the only person that will give me a str8 answer on gray wire to what/ white wire to what...yea if u find out what the other wire goes to that be great thanks again</TD></TR></TABLE>

Which other wire? The white wire or the O2 heater lead/ground?

 

you can wire the wide signal wire to your narrow band input signal to the ecu

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DutchEG6 &raquo;</TD></TR><TR><TD CLASS="quote">you can wire the wide signal wire to your narrow band input signal to the ecu</TD></TR></TABLE>

You don't want to do that unless you're datalogging. You are only supposed to run one of them at a time as to prevent interference. The ECU can't read the wideband input it recieves, it can only use the narrowband. The WB is for datalogging purposes.

 

Do what nota-eg said. But I wouldn't solder it just to make removal easier.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DutchEG6 &raquo;</TD></TR><TR><TD CLASS="quote">you can wire the wide signal wire to your narrow band input signal to the ecu</TD></TR></TABLE>

Yes and no. You can only use the WB signal if you're datalogging and have Closed Loop disabled in your tuning program.



I don't know what ecu you're running, or if it's chipped or not, but if you're ecu is chipped and you want to datalog in the future, you'll want to be able to switch your WB and NB wires easily.

 

Here another useful link for ECU inputs and colors.

http://www.ff-squad.com/technet/

 

People talk about using switches to go from WB to NB quickly and easily. I'm going to make something that will enable me to do the same thing, but I don't want to use a switch as I feel the low voltage of the sensor's output may be degraded too much, or there may be too much latency for it to really count. IE I'm just going to use a small circuit board and have a pin that I swap between for the WB and NB.

One of my old HD's are looking good for that little piece.

 

ok the white wire goes to d14-got that.... where does the gray wire go???.. is this for the 02 heater?... if it is what pin does it go to?...if it is not what do i do about the o2 heater?...thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmspecb18 &raquo;</TD></TR><TR><TD CLASS="quote">ok the white wire goes to d14-got that.... where does the gray wire go???.. is this for the 02 heater?... if it is what pin does it go to?...if it is not what do i do about the o2 heater?...thanks</TD></TR></TABLE>

No, gray wire goes to D14. That is the narrow band output, you need that unless you are datalogging.

The white wire from the PLX is for wideband, which is what you use when you are datalogging for tuning purposes.

For now connect the Gray wire to D14 and let the white one sit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nota-eg &raquo;</TD></TR><TR><TD CLASS="quote">People talk about using switches to go from WB to NB quickly and easily. I'm going to make something that will enable me to do the same thing, but I don't want to use a switch as I feel the low voltage of the sensor's output may be degraded too much, or there may be too much latency for it to really count. IE I'm just going to use a small circuit board and have a pin that I swap between for the WB and NB.

One of my old HD's are looking good for that little piece.</TD></TR></TABLE>

I feel the same way. What I'm doing is cutting the 02 input on my conversion harness and putting on a female connector and then put a male connector each on the WB and NB. Then I can just plug in what I want to use and I don't cut the stock harness.

 

cool thanks ... u think i could get away with using a scotchlok to tap into d14 with the gray wire so i dont have to cut the wire to the ecm or solder anything ...or will resistance affect the operation leaving the d14 original wire intact...like do i have to cut it completely in half and butt it to the plx or can i just run a T splice?

 

I'm sure you can tap into the wire without cutting it and be fine. I think a lot of people end up going that route. It would be better to leave it intact if you wanted to go back to stock.

 

excellent...because i always favor scotchloks because theres virtually no change to stock wiring