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I understand some folks are using other instruments such as OBD Fusion and I researched it as best as I could without owning one. What I am not getting is how the software determines the temperature of the fluid inside a spinning torque converter. The only temperature sensors in that transmission are attached to the bottom of the valve body just above the filter housing. They are reading the temperature of fluid going through small passageways inside the valve body. All of the technical data I can find says nothing about those two sensors reading fluid temperatures from the torque converter or fluid pan. Now the inlet for the filter is very close to those two sensors so I can see them picking up the temperature of the pan fluid so close by but the torque converter? I am missing something.
I can only speak of experience monitoring the two probes... #2 rate of temp climb during non-lockup use is far more dramatic than #1 so the TC correlation to #2 seems to correlate
IIRC... #1 is basically monitoring the pool of fluid in pan and #2 is setup in way to monitor fluid out-flow from the TC which would be the hottest fluid
EDIT: I am not sure you are going to find definitive documentation stating exactly what is being measured.
What is your specific concern? Measurement isn't accurate? Measurement too low or too high?
Sorry for the typo about transmission model and thank you, this seems to be a plausible answer. Of the four ScanGauge x-gauges available for our vehicle only one displays data. This led me to believe that the ScanGauge was reading the No. 2 unit because of its association with the temperature warning light on the dash. There is no way for me to tell which Sensor the ScanGauge is reporting. I am getting a high of ~184 degrees Fahrenheit during around town driving with an outside air temp in the low 80s. I have not tried it yet on the highway.
Had any one installed this kaon cooler. seemed next best fit to the OEM auxillary cooler plus more temperature reduction as they claim 20 to 30 degrees f.
I noticed on Tundra Forum they overlaid "Status of the Lock up" with current gear. Ring around gear is lockup indication. Green is in lockup. I currently have a digital gauge with 1=locked and 0=unlocked
I haven't played around with meshing the gauges together yet.
Hi all, I just purchased a CPO GX a few days ago and so far love it. I hooked up a Bluetooth OBD scanner to it and used OBD Fusion to pull some PIDs. One I was particularly curious about is transmission temperature. I’ve read a lot of posts on this forum about temperatures running in the 210 to 220 range, and that’s about what I’m seeing around town. Does this warrant adding an auxiliary cooler? I always thought that anything above 200 degrees is cause for concern. Perhaps these transmissions are different?
Second, I would encourage you to do as much reading as possible to educate yourself and then make your own informed decision.
Starting with this sticky thread as there are tons of great transmission threads in it: https://www.clublexus.com/forums/gx-...calls-obd.html
Everyone's climate area, GX use case, GX desired ownership length, and personal history/experience is different which makes everyone's opinion different.
In general under normal use and in a moderate climate an aux cooler is not needed nor required to prevent transmission damage and subsequent failure on the GX caused by overheated ATF. It has one of the most stout/robust drivetrains engineered for QDR (Quality, Durability, Reliability) on the market today.
The devil is always in the details however and who can predict every single use case or driving experience in their GX? not me that's for sure....
We added one because our personal goal is to keep our GX thru at least 2030 without issues. I also have decided to perform ATF drain and fills every 3 years or 30,000 miles whichever comes first because again, our goal is vehicle longevity and being an engineer I know there is no substitute for regularly performed quality maintenance to keep things operating optimally as designed. Also performing ATF drain and fills is super easy (once you do it) and it aligns with the transmission manufacturer's recommendation of fluid change intervals.
Lexus promotes a lifetime fluid because for 99.5% of drivers, never touching the transmission fluid makes the most sense (lots more risk than reward) as most people who buy a GX new don't keep them very long (not beyond the powertrain warranty generally) or lease them and turn them back in within 3 years. It's also a competitive landscape with regards to total cost of ownership these days and will get even more so with EV's becoming more mainstream. Traditional ICE manufacturers will be forced to limit the required maintenance to help their total cost of ownership argument when compared to an EV to prevent losing market share... ideally all traditional car companies would love to get to a point where the same maintenance is needed for an ICE as an EV (brakes and tires) but that will likely never be possible considering engine oil and all the other fluids, but it won't be for a lack of them trying as is I fear the case with Lexus/Toyota calling the transmission fluid "lifetime" although recently they have started adding a * next to the lifetime in the owners manual and recommending servicing it with new fluid if operating the vehicle abnormally. Honestly given the definition in the manual we all use the GX abnormally as we all in some capacity idle for extended periods of time... this is considered abnormal use now in the manual, same as towing. I never let our GX idle more than 10 minutes, if I hit 10 minutes I shut the vehicle off... these things are not meant to just sit an idle, they're not a diesel. The GX is, in the end, air cooled... i know i know, it's liquid cooled but that liquid is cooled by air (generally when driving) and by a fan during emergencies or to augment the thermodynamic process to keep the fluid cool enough... I digress.
All that to say, you have to make your own decision and if you do decide to add one, there's lot of experienced owners on here who have added them and are willing to help/advise you thru it if needed, including the cheapest place to buy the parts and do the actual mod...
Maybe they raised their prices but I just checked and for my GX460 2011 they want $74.99
And I don’t see anything about what it covers, specifically I need to reset TPMS
Maybe they raised their prices but I just checked and for my GX460 2011 they want $74.99
And I don’t see anything about what it covers, specifically I need to reset TPMS
TPMS can't be handled by Carista on 460.. You would need to look at Techstream
Has anyone gotten transmission temps to work on 2022+ . I have a 2023 and OBDLink Support said 2022+ is not supported for OEM-specific PID's yet with no ETA.
03-05-21, 02:37 PM
