All,

I have looked at the wiring diagrams from the service manual and I really am not sure which wire is the signal wire to connect a AF meter to.

The diagram for the front sensor shows the B-113 connector with wires labeled 1,2,3,4...

Am I correct that 1 & 3 are the heater circuit, which are green and black (diagram does not label the colors of these two)? Wires 2 and 4 are the O2 signal wires, black and white in color. Is this right?

I am assuming that the signal (high) wire is the white wire (#4) can help in verifying this? I don't want tap the wrong wire on the sensor.

Thanks in advance,

Chris

 

Kind of hard to tell. I guess if the "pulse generator" is what's heating the sensor, then yes, the black wire is ground and the white wire is the signal from the O2 sensor. It looks like the 2 other wires are multi-colored. I can't get the stupid tech info site to come up right now, but IIRC they were like red/yellow or blue/yellow. Not that those should matter if you're looking for the white one.

Do you have the signal characteristics of the sensor? I think I saw that gauges want a sensor with a 0-1V swing. Is this "narrow band" then?

 

The gauge I am installing wants a 0-2V swing. I am also having issues with the tech site... The wire diagram is not as detailed as I would have hoped...

Thanks,

Chris

 

I made a mistake, the wire colors are two black, white and blue (not green) on the sensor side of the B-113 connector.

So that would make Blue and one black the heater and White and the other black the ECU signal, white being the signal (high) and black signal (low)?

They are black, red/orange, blue and white on the ECU side of the B-113 connector.

Thanks,

Chris

 

It does not seem to be the white one...

 

Per my S-AFC directions, the O2 sensor wire is the white wire, pin 76. I connected the S-AFC wire there, and it is showing the O2 voltage no problem.