Transmission temperature monitoring with OBD2
- Thread starter johncg
- Start date
Looks to be the case. Fund this while looking on the site for another code, which I didn't find..
Note: The above code will only work on Toyota’s that use the CANSF protocol which was typically used by Toyota starting in the 2005 model year.* Our list of which Toyota vehicles support the CANSF protocol can be found here.
All right guys. Been using it for a while now, got it from 4Runner Club Kazakhstan. You need a bluetooth ELM327 adapter (Ebay) and Torque application installed on your Android-based phone. In Torque, you should create the following two custom PIDs:
PID: 21d9
Long name: Transmission fluid temp 1
Short name: TFT1
Unit type: *C
Max/Min: 220.0/-40.0
Equation: (((E*256)+F)/256)-40
PID: 21d9
Long name: Transmission fluid temp 2
Short name: TFT2
Unit type: *C
Max/Min: 220.0/-40.0
Equation: (((G*256)+H)/256)-40
These work fine on my 2006 T4R V6, and should work with any 750 transmission (V6 2005 to 2013, V8 2003 to 2009). I don't know if it will work with 340 transmission which they installed on 2003 and 2004 v6, but there's a chance it will - someone has to test it.
There are two temp sensors, one in the transmission, another one next to the radiator, the latter's readings are higher - it shows temperature of a liquid yet to be cooled down in the radiator.
I checked accuracy of these PIDs in Torque using another diagnostic tool (MVCI cable) and Toyota Technstream software - it showed diffrenece between Torque and TIS Techstream of around 1 degree Celcius - which I think was due to time it took me to switch between the two tools.
Now, the idea itself and PIDs were originally borrowed from one of Tacoma forums (Tacomaworld I guess), but when we checked their PIDs we found out they showed temperature about 20 degrees higher than the real one. That;s why we had to ask some programmers and Toyota fans from Russia to help us and now we all can use their correct PIDs shown above.
I hope it'll save you some time and money.
P.S. Just don't forget it's all in Celcius.
PID: 21d9
Long name: Transmission fluid temp 1
Short name: TFT1
Unit type: *C
Max/Min: 220.0/-40.0
Equation: (((E*256)+F)/256)-40
PID: 21d9
Long name: Transmission fluid temp 2
Short name: TFT2
Unit type: *C
Max/Min: 220.0/-40.0
Equation: (((G*256)+H)/256)-40
These work fine on my 2006 T4R V6, and should work with any 750 transmission (V6 2005 to 2013, V8 2003 to 2009). I don't know if it will work with 340 transmission which they installed on 2003 and 2004 v6, but there's a chance it will - someone has to test it.
There are two temp sensors, one in the transmission, another one next to the radiator, the latter's readings are higher - it shows temperature of a liquid yet to be cooled down in the radiator.
I checked accuracy of these PIDs in Torque using another diagnostic tool (MVCI cable) and Toyota Technstream software - it showed diffrenece between Torque and TIS Techstream of around 1 degree Celcius - which I think was due to time it took me to switch between the two tools.
Now, the idea itself and PIDs were originally borrowed from one of Tacoma forums (Tacomaworld I guess), but when we checked their PIDs we found out they showed temperature about 20 degrees higher than the real one. That;s why we had to ask some programmers and Toyota fans from Russia to help us and now we all can use their correct PIDs shown above.
I hope it'll save you some time and money.
P.S. Just don't forget it's all in Celcius.
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This post is the first return on my Google search for Tranny temp PIDs for my 2014 LTD. I'm guessing this PID is only valid on 4th gen vehicles. My 2014 works with the PIDs given here.
Temps
These codes worked just fine in my 06. Thank you!
What are normal Celsius temp readings? Is there anyway to change the formula so they display in Fahrenheit?
These codes worked just fine in my 06. Thank you!
What are normal Celsius temp readings? Is there anyway to change the formula so they display in Fahrenheit?
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You're welcome! Firstly, correction: both sensors are inside the transmission, one at the inflow, one at the outflow.
Sorry, I don't know how to make it show in F.
As for the working temp range... I tried hard and digged through several manuals and all sorts of forums. Here's what I've got: I saw it in one of more recent TSBs, that in order to properly check the fluid level in 750' transmissions, the temperature should be between 35-45 C. Originally, Toyota stated 50-60 C, and I believe this is the value to which the car's own service mode for checking the ATF temp is calibrated to. Pls refer to one of the posts on this forum/ elsewhere describing how to properly check the ATF level on 750' transmissions. On the other hand, based on personal experience (and a couple of friends'), city driving will heat it up to 45 - 60 C in winter, and up to 75-100 C in summer. Going uphill in hot summer day at about 50 mph will heat it further up to 110, and I don't think it should normally be any higher than that. The max value I saw for my car was 111 C. A/T oil temp warning indicator on the dashboard will light up at 150 C and will only disappear when it cools down to 135 C. So the working range is anywhere between 45 and 110 C, with preferred values between 60 and 80 C and critical values starting at 135 C. Also, they say that keeping it above 100C will significantly decrease the fluid's service life, as it will degrade faster. I think that's why the manual states changing it every 60K if towing or using in severe conditions as opposed to life-long usage in regular conditions.
Sorry, I don't know how to make it show in F.
As for the working temp range... I tried hard and digged through several manuals and all sorts of forums. Here's what I've got: I saw it in one of more recent TSBs, that in order to properly check the fluid level in 750' transmissions, the temperature should be between 35-45 C. Originally, Toyota stated 50-60 C, and I believe this is the value to which the car's own service mode for checking the ATF temp is calibrated to. Pls refer to one of the posts on this forum/ elsewhere describing how to properly check the ATF level on 750' transmissions. On the other hand, based on personal experience (and a couple of friends'), city driving will heat it up to 45 - 60 C in winter, and up to 75-100 C in summer. Going uphill in hot summer day at about 50 mph will heat it further up to 110, and I don't think it should normally be any higher than that. The max value I saw for my car was 111 C. A/T oil temp warning indicator on the dashboard will light up at 150 C and will only disappear when it cools down to 135 C. So the working range is anywhere between 45 and 110 C, with preferred values between 60 and 80 C and critical values starting at 135 C. Also, they say that keeping it above 100C will significantly decrease the fluid's service life, as it will degrade faster. I think that's why the manual states changing it every 60K if towing or using in severe conditions as opposed to life-long usage in regular conditions.
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As I told, the ones I provided were verified against Toyota Techstream readings, hence I believe them to be true. So you can try and compare the ones you provided with these by having both pairs of PIDs in Torque, you'll just have to convert between C and F.
Most likely, these should be ok for the 5th gen too, because its transmission is absolutely the same: one of Almaty, Kazakhstan local 4Runner community members had his 2010' 4Runner's transmission fallen apart this summer - after hard landing on sharp rocks due to road accident, so he ended up replacing it with 08' 4Runner's transmission, it runs perfectly. He didn't inform whether he had to modify anything or not.
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Martinjmpr
New member
May be a different code but there still should be one that works for the SGII.
My SGII worked fine in my 3rd gen ('99) T4R, so I don't know why it wouldn't work in a later model. :shrug:
Great info, thank you!
I did a quick job of converting the numbers above in to farenheit. The question I have is whether or not these are accurate with the reading put out by the SGII.
On the other hand, based on personal experience (and a couple of friends'),
City driving will heat it up to 113.00ºF-140.00ºF in winter and up to 167.00ºF - 212.00ºF in summer.
Going uphill in hot summer day at about 50 mph will heat it further up to 230.00ºF, and I don't think it should normally be any higher than that.
The max value I saw for my car was 231.80. A/T oil temp warning indicator on the dashboard will light up at 302.00ºF and will only disappear when it cools down to 275.00ºF.
So the working range is anywhere between 113.00ºF and 230.00ºF and critical values starting at 275.00ºF.
Also, they say that keeping it above 212.00ºF will significantly decrease the fluid's service life, as it will degrade faster.
I tried both 21d9 and 2182 in my 2014. 2182 gives good numbers, 21d9 gives trash. One of the 21d9 outputs gave me temperatures from -40 to 400 deg F and would vary between those numbers in a few seconds. The other output never changed. The PID moved from 21d9 to 2182 in 2010. Even if the transmission has the same wiring, you can change computer code to store the PIDS in different memory locations, which seems to have happened in 2010.
((((E*256)+F)/256)-40)*1.8+32
((((G*256)+H)/256)-40)*1.8+32
Those will give you outputs in deg F.
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noshortcuts
New member
Thanks guys, got Torque set up with these new settings including the degF settings which worked perfectly.
