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Transmission Temp and Torque Pro App

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goldensam

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Discussion starter · #1 ·
I realize that this might be somewhat of a limiting question. But in the hope that someone is familiar with OBD scanners and Torque Pro, I thought I would ask anyway.

I bought a Bluetooth scanner and the Torque Pro app wanting to be able to monitor the transmission temperature. The scanner and app work and give all sorts of information-- most of which I will probably not use. However, I have been unable to get it to read the transmission temp. I tried activating the Jeep specific PID's (whatever that means) and the one listed for 2012 or newer, which was recommended by some even though mine is a 2002, does get a reading. The downside is that it stays pegged at 32F. Since it seems that the scanner is communicating with the sensor, I feel that it should be possible for it to read accurately. Does anyone have any experience with this? Maybe changing the PID equation would work, but I have no idea of what to do.
 
#2 ·
The PID memory address for certain things is not the same across different platforms. You 2002 TCM is so different from anything used today I doubt the hex address would even be close.

Your better off installing a temp gauge either in the oil pan or in the line going to the cooler depend on what temp you like to see.
 
Discussion starter · #3 ·
Yes, a real transmission temp gauge would be the most reasonable thing to do for permanence, reliability, and even convenience. I was just trying to do something simple that would be quick and just for immediate and mere periodic use. It was surprising that the PID for 2012 and later seemed at least to communicate better than the PID for 2012 and before, though I suspect that that one was most likely for the Mercedes period only. I assume you have not tried this with your 2004?
 
#4 ·
goldensam said:
Yes, a real transmission temp gauge would be the most reasonable thing to do for permanence, reliability, and even convenience. I was just trying to do something simple that would be quick and just for immediate and mere periodic use. It was surprising that the PID for 2012 and later seemed at least to communicate better than the PID for 2012 and before, though I suspect that that one was most likely for the Mercedes period only. I assume you have not tried this with your 2004?
Click to expand...
without any working auxiliary working PIDs it's hard to even guess at where to start.

You do have a number returning. So you could always go up and down from that memory location and see if you get a number that makes sense.

On the SaturnFans site I am 1996SL11.9l and I spent a hour or so walking through the memory locations and actually found the Trans temp for the S Series saturn.

I did not try it for the jeep. But you do have a return number which means it's a place to start. Just remember you need to also change the receive address too. But it may not be that simple with a stand alone TCM. All the newer PCMs are single board controllers. So is that 32 you see a number in the PCM or TCM...........

My MacMentor reads Trans parameters including temp so if I needed to see it I have a way.

Wish where was a way to capture the talking between the scan tool and the PCM. If that were possible it shouldn't be too hard to see it request the Trans temp.
 
Discussion starter · #5 ·
Unfortunately, I do not have much of an understanding of what's involved. I have been looking for a direction online but have not found any claiming success. Since I do have that 32 degree reading, I think there could be away to make it work, but it is also possible that the reading is hardly more than random and no tweaking will actually give anything reliable. Thanks anyway.
 
#6 ·
I've been working on this as well. No luck this far. I've tried all kinds of PID's listed a cross the net. Even the "activator" PID location. Nothin so far. Tomorrow I already had planned some dedicated time towards this. I'll let you know if I make any leeway.
 
#7 ·
FubarI33t said:
I've been working on this as well. No luck this far. I've tried all kinds of PID's listed a cross the net. Even the "activator" PID location. Nothin so far. Tomorrow I already had planned some dedicated time towards this. I'll let you know if I make any leeway.
Click to expand...
Do you know what part of the transmit and receive is the actual memory location? It's hex base and no poking of numbers found on the Internet will find it. The ScanGauge users Manual has a good explanation on how the PIDs work and what different parts of the number string do what.

Assuming the math part and return digits are correct and all that's wrong is the location of the temp parameter......You have to walk through all the memory locations and look for a return number that makes sense. Then save those memory address on a tablet and then enter them one by one and see if the number increases with temp rise.

On the Saturn I had lots of memory locations that returned a number. Then I narrowed the list down to the ones I thought were close. One was 68 at start up with a cold engine and Trans. And then it would go to 27 when engine went into closed loop. So that was out. Then another was 54 at startup cold and when the fuel tables updated the number went to 19. So that was out too. Only one memory location had a number that rose with time like you would expect with a warming up Trans. So when I got home I unplugged the sensor to see if I found it. Sure enough the temp went to -40 unplugged.

Happy hunting. The mopar PIDs are not near figured out like the GM stuff. I had valid Knock Retard and LTFT bank 1 PIDs so I used their memory locations as a start. And there was a GM Trans temp PID that I assumed had the correct math. And went from there.
 
Discussion starter · #9 ·
Big Blue- Are you saying that the app works well in general or that it accurately displays the transmission temp on your WJ? If so, maybe he can help us.


Fubar- Good luck with your work today. Let me know how it works out.

86- Thanks for the explanation of the process. I still don't really know how to do it but maybe I can learn.
 
#10 ·
I have torque pro and I don't think it's actually possible to show tranny temp on a WJ. I go on the Torque forum occasionally (quite an interesting site as the writer of torque is one of the most regular posters so you get to speak to the man himself) and there have been a few folks trying to get this to work, with no joy, for the past couple of years or so. Not been there for a while but I doubt much has changed.
Other than that it's a very good app.
 
#12 ·
FubarI33t said:
I got it to go from 33.4 to 46.2. Assuming that's C instead of F. I might be getting somewhere. Even the Damn Wake one shows something. Still working it.
Click to expand...
does that convert to whatever outside temp is in the morning? And does it increase as you drive it......

Do you know what part of the TX and RX is the actual memory location?
 
#18 ·
goldensam said:
Well I hope it's not the last. BTW, mine displays 32 degrees whether it is defined as C or F. One of the PID's I tried kept changing the temp reading every few seconds anywhere from 19 to 300!
Click to expand...
the custom PID section of the ScanGauge users manual explains the the breakdown of the PID address
 
#19 ·
86cj74.2L said:
This is the first time I heard that the Torque Pro app displayed Trans temp on a WJ.
Click to expand...
It doesn't! Like they have said on here....it does not show the correct temp...therefore it does not work. Take a look at the Torque app forum.....no-one on there, even with the power of the writer of torque behind them, has managed to get it working properly/reliably.
 
#20 ·
I think the biggest factor towards a future positive outcome would be to seen if the trans temp sensor is even tied into the ecu/tcu or does it just go to that little light in the cluster. If it does go into the ecu, then we stand a chance on figuring this out.
 
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goldensam
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