Basically what it says - I'm using ProScan from myscantool.com. There is no voltage monitoring at all - basically it acts like it's not supported. I have the ElmScan 5 hardware (supports all protocols). Is it possible the software just doesn't support WRAF (wide range air/fuel aka wideband O2)? Does anyone use any other software that does read it?

EDIT: I should probably mention that it doesn't read from EITHER O2 sensor - not the wideband, and not the narrowband.

 

I use Autotap and it supports the narrow-band 02 sensor. I get the actual voltage I've got a fomula in excel that converts it back to A/F -but the narrowband sensor is only accurate near the 14.7 A/F mark.

 

The wideband part of the Toyota OBD-II is not standard and no regular OBDII scanner will work unless it has the special software that will interface with the Toyota ECU to read the non-standard sensor data. I personally have Proscan also and I really use it to monitor ignition and fuel trims. If you want to tune using a wideband I do no recommend an OBDII scan tool because the frame rate is very slow. Just get a wideband.

 

Sounds like it's as good as the software... AutoEnginuity(.com) looks pretty good, and you can buy the Toyota-specific addon to get those codes.

http://www.autoenginuity.com/Toyota_...or-list-1.html

This suggests that it actually works - they say 1ms refresh rates too. That's pretty spendy, when you add it all up though. (About as much as a wideband...)