02 Sensor Signal Wire

[jet150]

Hey people can anyone help me out?

I want to know on the ECU pinout which wire is the 02 sensor signal wire.

 

[Kitty's VR4]

Rob,

Here, Connector 4 - Pin 6

 

[jet150]

Thanks heaps Kat.

 

[snickells]

OMG robby you lazy bastard! Did you even search???

 

[jet150]

OMG robby you lazy bastard! Did you even search???

HA, HA, HA, Yes I did Stevo

But on the ECU pinout it says lambda sensor front not 02 sensor signal. Thats where I got confused.

 

[jet150]

Ok, now who knows which is the signal wire on the plug that plugs into the 02 sensor?

There are 4 wires:

Black ?
Black ?
Red ?
White ?

Kat where are you?

 

[Kitty's VR4]

Rob.

I'm pretty sure the "OEM O2 Sensor" off the top of my head its like this.......

2 Black cables: 02 sensor heater + & -
White cable: 02 signal wire to ECU
Blue cable: 02 sensor earth wire

Seeing your looking at a red wire I'm not completely sure how yours is going to work, was it supplied with any kind of schematic?? If not, what the Brand and Part # and I'll see what I can dig up.

Also if your instantly looking for a signal, you wont see it as the heater has to do it bit first IINM.....

 

[Kenneth]

I am pretty certain that it is the BLUE wire which is the Signal, and white is earth.

 

[Kitty's VR4]

There you go Rob


Damn you Kenneth, I was going to put the line Kenneth ??? where fort arte you ????

Kenneth am I right in assuming it won't produce a signal off the bat???

 

[Kenneth]

It probably will produce some form of signal, but it wouldn't be reliable. My understanding is that often the ECU will watch for a specific resistance from the sensor to tell when it is heated, and only start using it then.

Hard to say for certain without actually looking at the ECU code though!

 

[jet150]

Ok peoples im slowly getting somewhere, yes im getting signal from the blue wire which is white on the cars plug but on the air/fuel gauge im trying to hook up it showing lean, rich, lean, rich, lean, rich....... constantly.

What am I doing wrong? should I get the signal from the ECU?

CAR 02 SENSOR
black black
red black
black white
white blue

 

[Kenneth]

That is correct, and exactly what the ECU does to average out the AFR at 14.7.

The behaviour you describe is what is referred to as CLOSED LOOP running, where the ECU uses the O2 sensor information to maintain the correct AFR.

Correct for the cat to keep the emissions low that is

 

[jet150]

So do I connect the signal wire from the A/F gauge to pin 6 on plug 4 which is the lambda sensor front?

That didn't work either just got the same signal as before.

 

[jet150]

This is starting to piss me off:cursing:

Is there a 02 signal wire that shows a stable reading in these cars????

 

[bradc]

No there isn't, you need to do some searching on wide and narrow band

 

[Kenneth]

I already told you that the "unstable" signal you are getting is perfectly normal for closed loop running of the car. What you are seeing is that the AFR is actually going rich, lean, rich, lean etc.

Another problem you have is that a narrow band O2 sensor is only really able to tell you that the AFR is 14.7:1. The rest of the time, while it knows richer or leaner, it doesn't know by how much.

In that regard, monitoring it is largely pointless. If you want to monitor your AFR, get a wideband O2 controller and sensor. Fortunately most of those have a narrow band simulated output which you can use to replace your standard sensor.

 

[jet150]

Thanks Kenneth, the gauge doesn't do much for me. I've had it for a while just sitting in the box so I decided to hook it up.

The flashy lights are cool, not lol.