2010 Legacy O2 heater resistance for EGT

[Bigred5442]

Hello All,

 

is monitoring the O2 sensor resistance as a check on EGT something that is possible on a USDM 2010 legacy GT?

 

I have tried to use the romraider logger, and it doesn't seem available (this may be because there is not a RR Logger definition for the 2010 GT as far as i can tell), and i have also tried to use Btssm, but when i try to log the parameter P56 "A/F Sensor #1 Resistance" this stays steady at a value of 31.

 

in addition to this, i try and log P32 for the "Front O2 Heater Current #1", but that stay steady at a value of 10.

 

i can log all "normal" parameters in Btssm, and they seem accurate, but these "custom fields" don't seem to work for me, or i have the wrong hex address.

 

so, either i am doing something wrong, or this is not available for the 2010 legacy.

 

does anyone have experience with this and can let me know either that i am chasing something that doesn't exist, or if they are monitoring these values, how they get it to work.

 

Thanks!

[stewdogg]

From what I understand, the stock O2 sensor on the 5th gen Legacy's isn't sensitive enough to log the changes to air fuel ratios. I guess the 2015+WRX sensors are better and able to log the changes. I'm not sure if the lack of sensitivity directly relates to the EGT's as well or not...?

[Bigred5442]

hmm, in regards to AFR, i was under the impression that all the 32 bit ecus used the same sensors, and that the stock sensor on the 5th gens (and other similar year vehicles)was good down to 11.2 ish. But maybe i got information mixed between 4th gen and 5th gen.

 

so you are saying the difference is in the sensor, and not in the ecu, and that 2015+ WRX's have a better sensor, that can no only be used to monitor AFR down to 11.2 ish, but that the resistance of the heater circuit of that O2 sensor can be used to monitor the EGT, when the current is near zero?

 

are the o2 sensors interchangeable between the vehicles that you are aware of (physically and electronically)?

 

id like to be able to monitor both to make sure things are OK while just driving around. any tuning would be done with a aftermarket wideband.

 

Thanks!

[moral hazard]

The 2010 legacy GT does work with romraider logger (I use it often).

 

Have you downloaded the latest logger definitions from the last post here :

http://www.romraider.com/forum/viewtopic.php?f=8&t=1642

 

And make sure you follow the steps:

Download the file of the units you would most likely use from the bottom of this post.

Unzip the logger.xml file into your preferred definitions directory replacing the existing file (if applicable) or in another directory of your choice where it is unlikely to be moved or deleted.

Start RomRaider's logger from within RomRaider by selecting "Logger" -> "Launch ECU Logger" from the menu bar.

From within RomRaider's logger, select "Settings" -> "Logger Definition Location" from the menu bar.

Select the location of the new unzipped logger.xml file.

 

 

The sensor in the gen V is good down to 11.2 AFR as you already mentioned.

[Bigred5442]

Hello Moral,

 

i have used rom raider to log, and was able to get data, but it didn't seem to have all the parameters available, (such as the O2 sensor resistance and current). That is what my statement above about it "not being available" was in reference to, not rom raider in general not being available for the 5th gen LGT. Sorry for the confusion.

 

i kind of assumed that some of the parameters not being available in rom raider was due to there not being a rom raider definition file available for the 2010 USDM LGT (at least, not that i could find)

 

i believe i am using the "Logger v 346" from that post, but i will check when i get home.

 

i typically use Btssm to log anyway because it is just easier to plug my phone in and log than carrying around my laptop, so i never really dug into using rom raider to log.

 

in any case, have you ever logged the O2 sensor heater resistance/current? i know it has been mentioned on both this site and the rom raider site that it can be used to get a rough idea of what EGT is, enough to know you are running safe, but i don't know how to get it to show in either Btssm or rom raider, or if it is even possible to do this on the 5th gen LGT.

 

Thanks!

[moral hazard]

I see what you mean now. No I have not logged that valve , because I was not aware of the benifits.

 

I will endeavour to check again on my end this coming week.

 

I do not believe this is a definition issue as there has been a ticket open and sorted for that rom.

extended logger addresses mentioned here:

http://www.romraider.com/forum/viewtopic.php?f=8&t=6958

http://www.romraider.com/forum/viewtopic.php?f=34&t=8706

 

Will continue to investigate also.

Edited September 7, 2019 by moral hazard

[Bigred5442]

Thanks for the info Moral, i am apparently bad at search, as i looked all over and couldn't find those definitions.

 

For reference, here is a link to what i am talking about: https://www.romraider.com/forum/viewtopic.php?f=33&t=8134

[stewdogg]

so you are saying the difference is in the sensor, and not in the ecu, and that 2015+ WRX's have a better sensor, that can no only be used to monitor AFR down to 11.2 ish, but that the resistance of the heater circuit of that O2 sensor can be used to monitor the EGT, when the current is near zero?

 

are the o2 sensors interchangeable between the vehicles that you are aware of (physically and electronically)?

 

That's what I was told by my tuner, that the 15 WRX had a more "sensitive" O2 sensor and the stock gen 5 sensor isn't "sensitive" enough to log the changes in AFR.

 

I'm sure the threads are the same between the two sensors, I just don't know past that.

 

Did you end up finding a solution?