1. Yes, I know the autometer a/f gauge is not much more than a neato light show. Unfortunately, I have to install this damn thing - long story.....

2. I want to install it, and wire it in without touching any of the factory wiring. One option is to wire it directly into the o2 sensor - as I have extended wires I can tap into.....

3. What are the different wires and what source(s) do I need to tap them into? There is red, black, and purple.....

4. Thanks.

 

red=power source 12v
black=ground
purple=signal from 02 sensor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TypeR76 &raquo;</TD></TR><TR><TD CLASS="quote">red=power source 12v
black=ground
purple=signal from 02 sensor</TD></TR></TABLE>


Thanks William!

So I can use battery for power source, ground to the closest grounding point on the chassis, and which signal from the o2 sensor do I use? There are 4 wires on the o2 sensor..... (1 white, 1 green, and 2 black. I'm talking about the primary o2 sensor that I checked - I dunno if the 2ndary is different.....)


Modified by Black R at 8:13 PM 4/30/2003

 

Red wire- connect to a fused and switched 12V positive source that is turned on and off with the ignition switch.
Black wire- connect to good engine ground.
Violet wire- connect to oxygen sensor signal wire. Connect to vehicle wiring harness, not oxygen sensor since some oxygen sensors use a shielded wire.

thats it

 

it should be green wire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg_nezay &raquo;</TD></TR><TR><TD CLASS="quote"> Violet wire- connect to oxygen sensor signal wire. Connect to vehicle wiring harness, not oxygen sensor since some oxygen sensors use a shielded wire.

thats it </TD></TR></TABLE>


Anybody know this for sure on an '01 itr? It would ease the installation and cleanliness of the install.....

 

solid white wire. theres only one

 

If your not sure about the wire. Test both with your voltmeter. If you find a wire that makes the bargraph line on the bottom of the meter flux, thats your signal. (Note: only with the car running and in closed loop) If you find one with a solid voltage, then thats a heater wire. There should be two black wires. Those are both grounds for the heater and sensor. A little testing never hurts to be sure. Have fun.

 

.....I just can't really test the signal in the wire without cutting the plastic away.

What would be bad about using a shielded signal as opposed to one that isn't?

And should I use the primary or 2ndary o2 signal?

 

while you guys have this topic open i have a question i would like to add.

do you think it would make any diffrence if you tap the A/F guage signal input wire closer to the ECU or closer to the accual o2 sensor? do you think it would make any diffrence (if at all) for the readings?

thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Black R &raquo;</TD></TR><TR><TD CLASS="quote">.....I just can't really test the signal in the wire without cutting the plastic away.

What would be bad about using a shielded signal as opposed to one that isn't?

And should I use the primary or 2ndary o2 signal? </TD></TR></TABLE>

Just backprobe the sensor using a pin. Use the primary HO2S. I'm almost positive that the wire is green.

In relation to "non-VTEC's " question. No it does not matter where you tap into the wires. The responce and sample rate on an Air/Fuel gauge is soooo slow. That's why most people will say that they are pointless. But cool to have for a general idea.......a very general idea.

 

What about the shielded signal vs. non-shielded?

 

The o2 signal is always shielded except at joints in the harness. Other important
sensor wires are also shielded.

 

It does not really matter whether it's shielded or not. That signal is the same no matter where you decide to tap into it. I soddered my signal wire right next to the HO2S and used shrink wrap on it. No problems for two years.

 

why dont you tap into your D14 instead of ******* with engine bay?

 

Tap into your ecu harness. For the 02 signal, it'll be much easier..

Use a splice tap.. can be removed w/ no damage..

No cutting of wires needed.