A/F and O2 values for 2g Prius - Need help.

Still a new to using the SG2, but the main purpose of the purchase was to diagnose my P0420 CEL.

I purchased it with the intentions of reading the A/F sensor (pre-cat B1S1) and O2 sensor (post-cat B1S2) voltages to determine if the sensors were bad or if it was actually the cat.

Using these XGauge codes for CANSF:

O2 Sensor Data for CANSF vehicles:
Gauge - Bank 1 - Sensor 1
TXD - 07E00114
RXF - 044145140000
RXD - 2808
MTH - 000100020000
NO VALUE

Gauge - Bank 1 - Sensor 2
TXD - 07E00115
RXF - 044145150000
RXD - 2808
MTH - 000100020000
VALUE: ~0.7-0.85V

Air to Fuel Ratio for CANSF vehicles:
Gauge - A/F Ratio Bank 1 - Sensor 1
TXD - 07DF0124
RXF - 044145240000
RXD - 2808
MTH - 05B900800000
VALUE: 18.0@0rpm and ~14.0-14.5 while engine is running.

Since the SG can't read the voltage for the wideband a/f ratio sensor, how can I check whether the sensor is still good or not? Am I inputting the code incorrectly?

Any help would be grateful.

Thanks,
Anthony

 

Thanks for the awesome reply Vincent.

I went ahead and used the codes you gave me, but I'm not really sure what the values mean.

I set the Prius into inspection mode (1000rpm) and took a video of the SG2 display.

Using code:
Gauge - Bank 1 - Sensor 1
TXD - 07E00124
RXF - 044145240000
RXD - 3010
MTH - 001908000000
Notes - Min.: 0 V, Max.: 7.999 V (Idling 2.8 V to 3.8 V in Inspection Mode)
VALUE: All over the place.

Using code:
Gauge - A/F Ratio Bank 1 - Sensor 1
TXD - 07E00124
RXF - 044145240000
RXD - 2808
MTH - 07CF09F60000
Notes - Min.: 0, Max.: 1.999
VALUE: Pretty consistent @ ~1.0.

Looking at the video:
-Top left: Bank 1 - Sensor 1 (using your code)
-Top right: Bank 1 - Sensor 2 (value in voltage)
-Bottom left: A/F Ratio Bank 1 - Sensor 1 (using your code)
-Bottom right: Inspection mode @ 1,000 RPM

[ame="http://smg.photobucket.com/albums/v728/anthongy817/?action=view&current=VID_20110906_225009.mp4"]VID_20110906_225009.mp4 video by anthongy817 - Photobucket[/ame]

Thanks for all the help,
Anthony

 

Thanks again Vincent.

Based on the RM, I don't really understand how to conduct/interpret the "Active Test A/F Control" based on their "Case" chart.

Looking at the "Voltage output when ”active air–fuel ratio control” is not performed", the waveform for the heated oxygen sensor after cat (B1S2) is good, but the waveform of the A/F sensor before cat (B1S1) is completely off.

Chart shows normal voltage for B1S1 between 3.0-3.4V, my values fluctuates all over the charts between 0.91V to as high 7.63V.

Since the waveform for B1S2 is consistent and no major fluctuation, it should mean that the catalytic converter is still good right?

If you get a chance to take a look at the video that would be great, no rush at all.

Many thanks,
Anthony

 

Here's a better video now of the SG2 display and car in inspection mode.

@idle(1000rpm): oxygen sensor post cat is steady at ~0.8V.
@2500rpm: oxygen sensor post cat is steady between ~0.15-0.2V.

AFR sensor (B1S1) is still fluctuating all over the place regardless of rpm speed.

[ame="http://smg.photobucket.com/albums/v728/anthongy817/?action=view&current=VID_20110907_121546.mp4"]VID_20110907_121546.mp4 video by anthongy817 - Photobucket[/ame]

Thanks,
Anthony

**Sorry for all the trouble. I would just bring it into a dealer to fix, but funds are low, and I don't trust the smaller shops here with a hybrid.