Ok here it is, I was at work this week and had to scann a car with running problem. I had a 24x rpm signal loss I figoured that part out and fixed the car, but what I noticed is that with my scanner (snap-on mt2500) in the data stream I had a af ratio. like 14.0 and ---- just like a wideband. So now im thinking if this car had it then we might be able to take the o2s out of theses car and use them as a very cheap wideband. It was a hyundi santa fe

Does anyone have a wiring diagram for a wideband?

 

well, there are a whole slew of OEM widebands. civic VX 96-00 HX, a few new accords, new beetles. just to name a few. the new turbo beetles factory wideband can be had for around $40, and has been used in DIY widebands a few times that i know of. if you want a factory wideband i still have my VX L1H1 i will sell for $50.

 

but what would we hook up to them to get a reading?

 

Something I thought about last night...

Knowing that wideband O2 sensors have a linear 0-5v output, and knowing the A/F ratio vs voltage, could we just use a digital multimeter and aim for a voltage instead of aiming for an A/F ratio? This would simply require a WB O2 sensor and a multimeter, no need for WB controllers and such... (A/F Ratio being 2*Voltage +10)

This could be a nice alternative for home tuning? (don't know if this has already been discussed)

 

good idea, but if we get a old multi meter(analog) and just change the backing on to match the wideband numbers

 

so does a wideband doesnt it?

 

if you could datalog the voltage then you would be basically bypassing the wideband controller, all it does is convert the 12v signal to a ratio on a scale. if you datalog the voltage yourself and covert to ratio via the linear scale its the same thing.

 

nice info