Connecting Air Fuel gauge - AE101

[aesc]

Hey,

Prob covered before but search revealed nothing useful...

Well looks like im getting a A/F gauge so basically want to know the simplest way to get a voltage reading? Id rather not have a wire coming out of the diagnostic connector either And what is the pin code in the diagnostic connector for the oxy sensor voltage?

Also I should be able to run power off the same wire from my boost gauge ok, but can i connect the ground wire to the same wire as the boost gauge? There are both Autometer gauges if that helps.

Thanks

[fatgtr]

a/f gauge i asume air fuel gauge. they have a sensor that plugs into the exhaust pipe. u could power it from the same wire asyour boost gauge. but ground it to the frame somwhere.

[aesc]

Yep Air Fuel gauge.

Yip realise there is a sensor but I shouldnt have to run a wire all the way down there to get a reading. Sure theres an easier and less rangi way

So I can ground the A/F gauge on the same ground wire as my boost gauge?

[1598cc]

Yip you can use any ground .

Do remember tho that narrow band o2 sensors arent accurate

[Lloyd]

They'll tell you if you're running rich on boost or not which is about all you need them for.

I ended up finding what I thought was the right wire on the ECU in my GTZ and wasn't getting the reading I was after. Didn't seem to get the right reading at the sensor either and ended up running a wire to the diagnostic box.

Power and ground should be fine from the boost gauge (for the light anyway) and you'll have to find another wire for the ACC so the gauge only comes on when the key is on

[snwtoy]

AFAIK, the signal from an oxy sensor is a variable resistance, not a voltage.

[matt dunn]

AFAIK, the signal from an oxy sensor is a variable resistance, not a voltage.

No. Narrow band o2 sensors have a 0 to 1 volt output.

Dont know about wide band, but dont know of any cars that have wide band factory anyway.

matt

[JamesM]

WB depend on the sensor.. i know of 0-1 and 0-5..
the 0-5V bosch ones are common on some VW's i think it is.

[aesc]

ended up running a wire to the diagnostic box.

Thanks for your input HRT.

So did you get a reading from the VF pin on the diagnostic connector?

[snwtoy]

AFAIK, the signal from an oxy sensor is a variable resistance, not a voltage.

No. Narrow band o2 sensors have a 0 to 1 volt output.

Dont know about wide band, but dont know of any cars that have wide band factory anyway.

matt

Cheers

[vvega]

dont attempt to measue it with a digital multimeter as it will kill the sensor....

also grounding the output wire can also burn it out

v

[Lloyd]

They aren't generally a variable resistance. The sensor itself generates a voltage through a chemical reaction with the oxygen in the exhaust system

Think it was the OX terminal in the Diag box, cant be too sure though as the car isn't here sorry

[ChaosAD]

Some hondas have wideband from factory. Its the controller thats complicated/expensive.

[aesc]

Think it was the OX terminal in the Diag box, cant be too sure though as the car isn't here sorry

Yeah it is too, cheers. Thought it was VF because I remember testing the oxy sensor which is done by measuring voltage between VF1 and E1.

[vvega]

Think it was the OX terminal in the Diag box, cant be too sure though as the car isn't here sorry

Yeah it is too, cheers. Thought it was VF because I remember testing the oxy sensor which is done by measuring voltage between VF1 and E1.

i hope you used a analoge multimeter otherwise it will be damaged
and yes they generate a voltage with a chemical reaction but with anything that produces power they do not like a direct short

unfortunatly they produce less current than most digital multimeters draw to make there "sample reading"

v

[vvega]

or you could use a osiloscope
also be aware that a o2 sensor will not produce voltage till it is up to operating temperature

http://home.flash.net/~lorint/lorin/fuel/oxybench.htm
that might help you

v