More PIDs for Torque App
- Thread starter TJBaker57
- Start date
The PID ~likely~ will work for an 06.
PID 0x1641 does not exist in the earlier P10 PCM, 2002-2005.
PID 0x1641 also does not seem to exist in the 2007 P12 PCM but I cannot confirm that until I get my hands on a 2007 P12 and ask it.
I just now confirmed that the mode 23 memory read of HVAC Module memory location 0x0020F8 also works in two manual control modules I grabbed from the Upull a few weeks ago. I tested against a #15132072 with a date of 18May 04 and a #10395426 dated 16Dec 05.
To refresh: this allows reading the status of the low pressure switch, the compressor feedback signal and the A/C Permission status.
The spreadsheet has all the needed info for Torque Pro. The equations are similar for Car Scanner or OBD Fusion.
In other business I have isolated the front propshaft speed, rear propshaft speed, and slip speed for the 5 different TCCMs that I have. Among the 5 TCCMs I have there are 3 different sets of memory locations for these 3 parameters. I also have the mode switch return voltage and the encoder position return voltage for these 5 TCCMs.
Not sure how best to organize all that so I'm sitting on it for now.
Scanned and located the 4 HVAC actuator positions for those two manual control modules today. Both of those manual controls used the same memory address for the data but I have no vehicle to verify the operation with.
So I moved over to my 2002 with automatic controls and not surprisingly the addresses are different. But I located them in short order and tested in Car Scanner as seen below. My 2005 Yukon with automatic controls also uses different memory locations so I will sort them out next.
I was hopeful I might find some uniformity to these data points but it is looking like they will vary.
So I moved over to my 2002 with automatic controls and not surprisingly the addresses are different. But I located them in short order and tested in Car Scanner as seen below. My 2005 Yukon with automatic controls also uses different memory locations so I will sort them out next.
I was hopeful I might find some uniformity to these data points but it is looking like they will vary.
Thomas… I was searching around for some After-Market OBD2 Scanner Graphing capabilities (other than using either a PICO or Hantek Scopes) for viewing the Rear O2 Sensor Behavior when Diagnosing a Poorly Performing Catalytic Converter (P0420 Code) and THIS Video from a Canadian VOP showed some real promise:
However, I was wondering whether or not Torque Pro is also capable of rendering Oscilloscope-Like Graphs in this same manner. If the Graph you just displayed above came gratis Torque Pro… it opens up so many more opportunities for viewing comparative Module and Sensor Data as Oscilloscope “Voltage Over Time” Graph Analysis On Screen with the X & Y Axis Parameters being clearly labeled.
However, I was wondering whether or not Torque Pro is also capable of rendering Oscilloscope-Like Graphs in this same manner. If the Graph you just displayed above came gratis Torque Pro… it opens up so many more opportunities for viewing comparative Module and Sensor Data as Oscilloscope “Voltage Over Time” Graph Analysis On Screen with the X & Y Axis Parameters being clearly labeled.
Tried these on my 2007 Avalanche, and they did not work.
I was this close!!! lolYep, didn't work on my 2021 Escalade either. It looks like they changed those PIDs when they added the CAN bus.
Hi!
This is probably a bit late, however i've seen this thread whilst looking around for some other information - I think it might be worth mentioning that Torque recently gained the ability to monitor canbus directly as well as normal PIDs (*at the same time!*, or dedicated canbus monitoring).
This means that Torque can now import DBC files (like the ones on: https://github.com/commaai/opendbc ) into the PID editor and get access to all the brodcast CANBUS information
And get access to all the sensors contained within (at quite a speed if you use the dedicated mode (settable in the vehicle profile->advanced settings->protocol->CAN/DBC Bus Monitor) or just leave the protocol at the default to get access to normal PIDs and canbus monitor at the same time
Anyway I hope this is helpful and isn't too much of an interruption!
This is probably a bit late, however i've seen this thread whilst looking around for some other information - I think it might be worth mentioning that Torque recently gained the ability to monitor canbus directly as well as normal PIDs (*at the same time!*, or dedicated canbus monitoring).
This means that Torque can now import DBC files (like the ones on: https://github.com/commaai/opendbc ) into the PID editor and get access to all the brodcast CANBUS information
And get access to all the sensors contained within (at quite a speed if you use the dedicated mode (settable in the vehicle profile->advanced settings->protocol->CAN/DBC Bus Monitor) or just leave the protocol at the default to get access to normal PIDs and canbus monitor at the same time
Anyway I hope this is helpful and isn't too much of an interruption!
I purposely haven't updated my Torque Pro for some time due to a fiasco the last time around. And since none of my vehicles have any CANBUS (ISO 15765-4) I don't see myself updating this time though I am curious about the new features.
I see I haven't posted here in this thread for some time. I was driving the Yukon the other day and monitoring HVAC door positions so I believe I have that data figured out though I don't remember any of it at the moment. I was actually monitoring my Arduino project but the HVAC doors were displayed as well.
Hello folks!
Good day! May I know if anybody has PID for the electronic suspension control module? I've been reading thru the thread and can't seem to grasp the info quiet well yet. My goal is to see if I can recalibrate it. It is riding high after a changes the coils. Might have messed up the ride height sensor in the process.
Good day! May I know if anybody has PID for the electronic suspension control module? I've been reading thru the thread and can't seem to grasp the info quiet well yet. My goal is to see if I can recalibrate it. It is riding high after a changes the coils. Might have messed up the ride height sensor in the process.
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gmcman
Member
- Dec 12, 2011
- 4,673
Since this thread gets a lot of views from knowledgeable people, I have a thread I started in need of assistance.
Didn't want to stray off topic from GM.
Thanks.
gmtnation.com
Didn't want to stray off topic from GM.
Thanks.
Torque Pro help needed for 2014 Pathfinder
I'm looking at a friends 2014 Pathfinder, has. P0420 Catalyst system efficiency below threshold. I believe this was an older code, many months ago, but I'm not seeing any issues. Did not specify bank# and my Torque Pro app doesn't show any values for what I believe is the 3rd cat. Also, I set...
gmtnation.com
Hello, TJBaker
im trying to get Fan Speed PID for TORQUE APP and i was following your pid (22162B) but nothing happened i just saw the green signal but almost 0.0 nothing moving
i have 2012 gmc yukon
Thanks
Thanks azswiss..
so there is any PIDs can reading the (FAN SPEED) for my vehicle?? please help !!
LikeEnvoy
Member
Has somebody found PIDs that work for TPMS in a 2007 Envoy? I tried those given in this thread but only one gives any value (TPMS LR pid 222491 with header 6CA1F1) and its fixed at 12 psi (my tire is at 35psi and even when I change the pressure this gauge does not change). Thanks 
(Mind you, my TPMS lamp has been coming on intermittently for a while (blinking for about a minute then going solid) so either one or more sensors is bad (low battery) or the module is intermittent. I was hoping to get a DIC cluster to see what that showed, but failing that, I hoped that Torque sensors would show if one or more sensors is bad.
By the way, I have tried a few more PIDs mentioned here. On my 2007 Envoy, the Oil Pressure switch lookup doesn't work (says OK all the time,even engine stopped).
Fuel level does work! The value did not match my gauge so I arrived at a divisor of 460 to match my 25% fuel gauge reading. I'll check a few more levels to see how that one tracks.
The Oil Pressure calculated by the PCM for the cluster gauge gave me a value but I suspect it's in psi(?). So I altered the formula (A*4*.146038) to A*4*.146038*6.89476 to get kPa (if the googled conversion is correct). My gauge usually reads just over the centre point of 275 kPa.
The Torque pid shows about 274 at idle and when I rev, it goes up to about 350 kPa then falls a bit; always goes back to 274 at idle. Probably the PCM calculates pressures as the engine speed varies but the gauge is designed to clamp the range at the centre.
(Mind you, my TPMS lamp has been coming on intermittently for a while (blinking for about a minute then going solid) so either one or more sensors is bad (low battery) or the module is intermittent. I was hoping to get a DIC cluster to see what that showed, but failing that, I hoped that Torque sensors would show if one or more sensors is bad.
By the way, I have tried a few more PIDs mentioned here. On my 2007 Envoy, the Oil Pressure switch lookup doesn't work (says OK all the time,even engine stopped).
Fuel level does work! The value did not match my gauge so I arrived at a divisor of 460 to match my 25% fuel gauge reading. I'll check a few more levels to see how that one tracks.
The Oil Pressure calculated by the PCM for the cluster gauge gave me a value but I suspect it's in psi(?). So I altered the formula (A*4*.146038) to A*4*.146038*6.89476 to get kPa (if the googled conversion is correct). My gauge usually reads just over the centre point of 275 kPa.
The Torque pid shows about 274 at idle and when I rev, it goes up to about 350 kPa then falls a bit; always goes back to 274 at idle. Probably the PCM calculates pressures as the engine speed varies but the gauge is designed to clamp the range at the centre.
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Not sure of the vehicle details (model, year) but here is a link to checkout:
The ELM/Torque thread on chevroletforum.com
TPMS PID details in post #14.
The ELM/Torque thread on chevroletforum.com
TPMS PID details in post #14.
LikeEnvoy
Member
Enter the PID as listed, do not append with 01.
From what I have seen, PIDs can have different ID's across platforms.
The attached Excel spreadsheet is a compilation of PIDs with specific reference platforms listed where available (e.g. 2005 Tahoe vs. 2002 Trailblazer 4.2L). You may have to do some experimenting to see if they apply to your vehicle. In addition to the PID spreadsheet tab, there is a CSV tab that contains the data that can be used to import into Torque.
LikeEnvoy
Member
Using pid 2215 (A/255*100) , Fuel level PID gives a response value, so I thought it worked, but I find it is reversed somehow.
I kept adjusting the multiplier as the tank went down, to get a reasonable value, but one multiplier did not work for all levels.
So I checked the raw value (A) and found it was 37 at full tank and 129 when the low fuel lamp turned on.
Can't figure out an equation to get the correct positive level of percentage remaining. Anyone?
Ah just noticed the excel sheet above has a different PID. Will try that first.
I kept adjusting the multiplier as the tank went down, to get a reasonable value, but one multiplier did not work for all levels.
So I checked the raw value (A) and found it was 37 at full tank and 129 when the low fuel lamp turned on.
Can't figure out an equation to get the correct positive level of percentage remaining. Anyone?
Ah just noticed the excel sheet above has a different PID. Will try that first.
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LikeEnvoy
Member
OK, the fuel level PID that works on my 2007 Envoy SLE is:
PID 12
unit: %
equation: A/2.55
header: A982F1
The value sems pretty accurate although sometimes it jumps to a very different value then back to the proper value(don't know why).
PID 12
unit: %
equation: A/2.55
header: A982F1
The value sems pretty accurate although sometimes it jumps to a very different value then back to the proper value(don't know why).
LikeEnvoy
Member
Now, if someone has a set of TPMS pids that works with my car that would be great. None of those in the excel sheet works on my car. Those in the post 14 of the chevy forum don't work on my car. (Thanks though, azswiss)
I'm still trying to find what is wrong in my TPMS system. Light blinks for 1 minute then goes steady. Just got new sensors with my new tires, so it's not those. Would be nice to see the pressures so I could see if any sensor is bad, just to prove if the LGM is receiving any pressures at all.
I'm still trying to find what is wrong in my TPMS system. Light blinks for 1 minute then goes steady. Just got new sensors with my new tires, so it's not those. Would be nice to see the pressures so I could see if any sensor is bad, just to prove if the LGM is receiving any pressures at all.
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Mooseman
Moderator
Didn't the shop relearn the new sensors to your truck? When the TPMS light does this, it means there's a problem with the system (no kidding!) and 99% of the time it's a sensor. Try to do the manual relearn. The instructions are in the owners manual. If the first sensor you try to learn doesn't, try to start at another one. It could be defective. Or it may hang up at another sensor.
LikeEnvoy
Member
Ah.. well, Yes they did relearn the sensors but the warning has been intermittent; on most of the time but off sometimes, so the system probably seemed to be ok for them. I did a manual relearn with no problem; all sensors triggered the horn.....but no help; same trouble.
I've read some posts on other car forums about backup camera interference with TPMS sensors. I wondered about that, because the trouble started not long after installing the new radio and backup camera.
Now, just a couple of days ago, I disconnected the backup camera cable and ... no more warning lamp! So it would seem the camera interferes with the TPMS sensor signals.
I have driven a couple of days so far with no warning. If this keeps up, it will prove it. I have written to the camera makers to see if they have come across this and if they have a good solution.
It could be electrical noise from the camera feeding into the LGM or maybe RF interference.
So if I hear nothing from the makers, I'll start by trying a ferrite ring on the camera cable and see.
I've read some posts on other car forums about backup camera interference with TPMS sensors. I wondered about that, because the trouble started not long after installing the new radio and backup camera.
Now, just a couple of days ago, I disconnected the backup camera cable and ... no more warning lamp! So it would seem the camera interferes with the TPMS sensor signals.
I have driven a couple of days so far with no warning. If this keeps up, it will prove it. I have written to the camera makers to see if they have come across this and if they have a good solution.
It could be electrical noise from the camera feeding into the LGM or maybe RF interference.
So if I hear nothing from the makers, I'll start by trying a ferrite ring on the camera cable and see.
I have to ask.... Where did you discover this PID setup?? Was it here somewhere or on another website?? Did you study up and create it yourself??
The reason I ask this is that while this works with Torque Pro other apps will likely not work with this setup. This is because this is not a true PID (parameter ID) but instead taps into the normal serial data communications between modules and most apps are not programmed to do this.
Now then, we could possibly use that same approach to look into your TPMS issue. If the Traiblazer class vehicles use the same approach as my 2005 Yukon there will be a module that receives the radio signals from the tire sensors and then continuously broadcasts the data on the serial data bus where the cluster picks it up and does it's job if displaying said data. Using a serial terminal app and the same dongle that is used with the Torque app these data messages can be monitored and within these messages we can see what module is sending them and are all wheels represented or is one or more missing and so on.
On my Yukon the module responsible for TPMS is the passenger door module. I haven't had the opportunity to check a later model Trailblazer class vehicle so while I might guess it's the same module I cannot say that it is.
Mooseman
Moderator
Talk about a revenant! Welcome back @TJBaker57 . Must have been a helluva hike.
The TPMS in the GMT360 is handled by the tailgate module.
The TPMS in the GMT360 is handled by the tailgate module.
It is indeed a helluva hike! Approximately 2200 miles with an elevation gain (and loss) equal to climbing up and down Mt Everest 16 times (more than 89 miles). Took me 147 days, my fastest time yet.
I wondered if that would be the case since that liftgate module also receives the key fob radio signals for the TrailBlazer platform. On my Yukon the TPMS data is broadcast in a single frame where all sensors pressure data is in one message one wheel after another. The pressure is reported in hexadecimal and appears to be reported where one bit equals one PSIG.
Here is a sample data snippet where I have highlighted part of the message that broadcasts the tire pressures. The values "28 29 29 2A" are the tire pressures in hexadecimal the decimal equivalents being 40 41 41 42 PSI. I believe the "FF" value would be the spare if it had a sensor.
The PID natively reports the oil pressure in kPaG where one bit equals 4 kPaG. The 0.145038 is a conversion from kPa to PSI. One may notice that your Googled conversion factor from PSI to kPa is the reciprocal of the 0.145038 multiplier!!
For display as kPaG one needs only an equation of A*4.
I thought I had once posted some discoveries related to modules that do not support service (mode) 22. I cannot find it now so maybe I never posted it! Not surprising really.
Anyway, folks who have noodled about adding PIDs to Torque Pro or other apps might notice the "OBD2 Mode and Pid" field always begins with "22". This is a service mode that is requested of the module being addressed. Service mode 22 is one of many services that may be offered by a given module. Service mode 22 is "Request Diagnostic Data by Parameter ID (PID)". This is then followed by a 4 character parameter ID such as 1142 which is the MAP sensor pressure value. This is a primary way Torque gets the vehicle specific data we see.
When I wanted to get data from the TCCM or the HVAC systems however I discovered that these modules and a few others do not offer service mode 22 at all. So even though I was able to discover the PIDs for much of the data I was after I had no way to request the data without having service 22. I set about trying other ways.
By reading out and recording the memory contents of these modules using service mode 23, request data by memory address, I was able to locate in memory some of the data I was after. I further found that Torque can utilize service mode 23 even though Torque was not designed for this purpose.
As I put together custom PID entries in Torque Pro I wondered if these entries might work for other users with different calibrations and so on. I grabbed several modules from the Upull yard and scanned those. They were different which meant the Torque Pro entries I had made would work only with my particular part # and calibration and operating system.
I found the differences were slight and I made up a schedule of maybe 5 different TCCMs with varying part, operating system, and calibration numbers. With this I could build Torque Pro entries for each of those 5 TCCM variations I have. This is cumbersome to say the least and who knows how many variations are out there.
Another thing happened while I was looking at the memory readouts while hunting parameter data. I saw a pattern of values that looked familiar. I had seen such data before. This requires a bit of explanation though....
You may wonder,,,, if these modules do not provide service mode 22 how do the expensive scantools get the data?? They use two different service modes, 2C and 2A. Service mode 2C allows for the creation of a handful of "dynamic pids" and 2A provides the means to read those dynamic pids. These dynamic pids each can hold up to 6 bytes and you choose what data you want to pack in those bytes using service mode 2C. So you pick the data you want, stuff it into one or more of these dynamic pids then call up these dynamic pids using service mode 2A.
But there is an issue if you try using Torque Pro for this. Even if you manage to get the dynamic pids loaded up Torque can't readily work using service mode 2A to read the pids because service 2A streams the data at a fast rate instead of sending the single response that Torque Pro expects.
So back to the memory readouts where I saw a familiar pattern of data values. What I recognized was a pattern of values I had in a dynamic pid at the time of the memory readout. I thought I had stumbled on the memory location of these dynamic pids but it turns out that for some reason it is a location of only the most recently requested dynamic pid.
I have scanned the entire range of memory available to me and the rest of the dynamic pid data is not there so I presume it is held in other memory unavailable to us. But I still have this one nugget available to me. The address does vary between TCCM part/O.S./Calibration numbers but it is quickly and easily found using the Bluetooth OBD2 adapter and a couple of free apps.
So I knew the PID numbers I wanted.
I knew how to pack them into a dynamic pid.
I knew how to add a button in Torque to send OBD messages and could use that to create the dynamic pid.
And I knew the memory address where I can read back that data into Torque Pro (and a couple other apps).
The last piece was that for the dynamic pid to remain actively refreshed the module needs to see a "tester present" message from the scantool every couple of seconds or the update stops after 5 seconds. I made a PID entry in Torque Pro to send this message. I placed this pid on the dashboard but hid the display behind another gauge so it didn't show.
I have two pages made up so far. One shows the controls and sensor data and a second page displays rotational data both sensed and calculated.
This second page is not true to life values as it is coming from not a vehicle but a TCCM in a six drawer chest in my kitchen! I am feeding the rear propshaft speed input with a frequency generator. In real life the front propshaft would be spinning due to friction in both the Transfer Case clutchpack as well as the front differential. The intermediate shaft rpm as well as the front axle disconnect delta rpm are calculated values.
FP = front propshaft
RP = rear propshaft
GR = gear ratio
FAD∆ = front axle disconnect delta rpm
Intermediate shaft rpm = (2FP-RP)/GR
FAD∆ = 2(RP-FP)/GR
Next up is to apply the same techniques to my automatic HVAC systems, both TrailBlazer and Yukon.
Anyway, folks who have noodled about adding PIDs to Torque Pro or other apps might notice the "OBD2 Mode and Pid" field always begins with "22". This is a service mode that is requested of the module being addressed. Service mode 22 is one of many services that may be offered by a given module. Service mode 22 is "Request Diagnostic Data by Parameter ID (PID)". This is then followed by a 4 character parameter ID such as 1142 which is the MAP sensor pressure value. This is a primary way Torque gets the vehicle specific data we see.
When I wanted to get data from the TCCM or the HVAC systems however I discovered that these modules and a few others do not offer service mode 22 at all. So even though I was able to discover the PIDs for much of the data I was after I had no way to request the data without having service 22. I set about trying other ways.
By reading out and recording the memory contents of these modules using service mode 23, request data by memory address, I was able to locate in memory some of the data I was after. I further found that Torque can utilize service mode 23 even though Torque was not designed for this purpose.
As I put together custom PID entries in Torque Pro I wondered if these entries might work for other users with different calibrations and so on. I grabbed several modules from the Upull yard and scanned those. They were different which meant the Torque Pro entries I had made would work only with my particular part # and calibration and operating system.
I found the differences were slight and I made up a schedule of maybe 5 different TCCMs with varying part, operating system, and calibration numbers. With this I could build Torque Pro entries for each of those 5 TCCM variations I have. This is cumbersome to say the least and who knows how many variations are out there.
Another thing happened while I was looking at the memory readouts while hunting parameter data. I saw a pattern of values that looked familiar. I had seen such data before. This requires a bit of explanation though....
You may wonder,,,, if these modules do not provide service mode 22 how do the expensive scantools get the data?? They use two different service modes, 2C and 2A. Service mode 2C allows for the creation of a handful of "dynamic pids" and 2A provides the means to read those dynamic pids. These dynamic pids each can hold up to 6 bytes and you choose what data you want to pack in those bytes using service mode 2C. So you pick the data you want, stuff it into one or more of these dynamic pids then call up these dynamic pids using service mode 2A.
But there is an issue if you try using Torque Pro for this. Even if you manage to get the dynamic pids loaded up Torque can't readily work using service mode 2A to read the pids because service 2A streams the data at a fast rate instead of sending the single response that Torque Pro expects.
So back to the memory readouts where I saw a familiar pattern of data values. What I recognized was a pattern of values I had in a dynamic pid at the time of the memory readout. I thought I had stumbled on the memory location of these dynamic pids but it turns out that for some reason it is a location of only the most recently requested dynamic pid.
I have scanned the entire range of memory available to me and the rest of the dynamic pid data is not there so I presume it is held in other memory unavailable to us. But I still have this one nugget available to me. The address does vary between TCCM part/O.S./Calibration numbers but it is quickly and easily found using the Bluetooth OBD2 adapter and a couple of free apps.
So I knew the PID numbers I wanted.
I knew how to pack them into a dynamic pid.
I knew how to add a button in Torque to send OBD messages and could use that to create the dynamic pid.
And I knew the memory address where I can read back that data into Torque Pro (and a couple other apps).
The last piece was that for the dynamic pid to remain actively refreshed the module needs to see a "tester present" message from the scantool every couple of seconds or the update stops after 5 seconds. I made a PID entry in Torque Pro to send this message. I placed this pid on the dashboard but hid the display behind another gauge so it didn't show.
I have two pages made up so far. One shows the controls and sensor data and a second page displays rotational data both sensed and calculated.
This second page is not true to life values as it is coming from not a vehicle but a TCCM in a six drawer chest in my kitchen! I am feeding the rear propshaft speed input with a frequency generator. In real life the front propshaft would be spinning due to friction in both the Transfer Case clutchpack as well as the front differential. The intermediate shaft rpm as well as the front axle disconnect delta rpm are calculated values.
FP = front propshaft
RP = rear propshaft
GR = gear ratio
FAD∆ = front axle disconnect delta rpm
Intermediate shaft rpm = (2FP-RP)/GR
FAD∆ = 2(RP-FP)/GR
Next up is to apply the same techniques to my automatic HVAC systems, both TrailBlazer and Yukon.
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I continue to fiddle with this and that. Got the memory address/DPID thing for my TCCM into Car Scanner. It works sometimes and goes off the rails sometimes. Here are a couple screenshots while it was working.
The first shows the front and rear propshaft speeds where it is seen how the front propshaft turns faster when the vehicle is cold and slows down as the transfer case and front differential warm up.
In the center of the graph I pass through a town. See the odd behaviour of the front propshaft speed as the rear slows down in mid graph?? It suddenly drops then speeds up? And again as the rear speeds up as I accelerate out of town the front also speeds up for while then suddenly drops for a short bit then resumes its overall warmup slowdown? I think this has to do with the shear strength of the Autotrak II and perhaps some frictions in the front differential. The road speed is right about 40 mph when this occurs.
Then there is this next shot of the same timeframe showing the intermediate shaft speed and the speed difference seen between the two gears in the front axle disconnect. As the front propshaft slows, the reverse rotation of the intermediate shaft speed increases and thus the speed difference in the disconnect climbs.
Next up is a shot of my CJ2 Automatic HVAC actuator positions. I left out the recirc in this shot. And there were no temperature adjustments to the two blend doors. The right side must have been between 57 and 58 as it can be seen fluctuating while the left side stayed steady. What is mainly seen here is the actions of the heater and defrost doors in response to discharge mode changes.
The first shows the front and rear propshaft speeds where it is seen how the front propshaft turns faster when the vehicle is cold and slows down as the transfer case and front differential warm up.
In the center of the graph I pass through a town. See the odd behaviour of the front propshaft speed as the rear slows down in mid graph?? It suddenly drops then speeds up? And again as the rear speeds up as I accelerate out of town the front also speeds up for while then suddenly drops for a short bit then resumes its overall warmup slowdown? I think this has to do with the shear strength of the Autotrak II and perhaps some frictions in the front differential. The road speed is right about 40 mph when this occurs.
Then there is this next shot of the same timeframe showing the intermediate shaft speed and the speed difference seen between the two gears in the front axle disconnect. As the front propshaft slows, the reverse rotation of the intermediate shaft speed increases and thus the speed difference in the disconnect climbs.
Next up is a shot of my CJ2 Automatic HVAC actuator positions. I left out the recirc in this shot. And there were no temperature adjustments to the two blend doors. The right side must have been between 57 and 58 as it can be seen fluctuating while the left side stayed steady. What is mainly seen here is the actions of the heater and defrost doors in response to discharge mode changes.
@TJBaker57, could not find a PID that worked for oil temp (no data for Mode/PID 221154, Header Auto). Do you have a working oil temp PID for your GMT800? Any suggestions?
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This is where my Arduino would come in handy. I can add a temp sensor anywhere of my choosing and have that data available to Torque Pro or other such app!
Interesting idea indeed. One promising spot would be just above the oil filter into the cap for the oil cooler lines.
I have a working model now but the code hangs occasionally and I need to track that down.
For purely test purposes I clamped thermistors from solar water heater panel controls to the coolant outlets on both the TrailBlazer LL8 as well as the Yukon LM7.
Not highly accurate because of heat loss and such, would need a well for an accurate measurement but it serves the purpose for rudimentary tests.
Yep! My arduino is just another device on the bus. I built my circuitry based on a design in the ELM327 datasheet.
The Arduino decodes the high and low, short and long voltage pulses into fully qualified messages and responds to a message from a PID I create in Torque Pro or, in this screenshot, Car Scanner.
