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Thread: Transmission temps don’t match
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12-07-2018, 05:53 PM #11
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Some of the OBD PIDs can be highly filtered where its unlikely there is more than one sensor measuring the transmission temperature. Its odd that the difference would be this large. How fast are the values changing on the tablet? I thought that it may be in Celsius and mislabeled but 66C is 151F.
MidwestCamper
Jim & Dawn
Near Milford, Michigan
2017 Imagine 2600RB
2015 GMC Sierra 1500 Double Cab 4x4
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12-07-2018, 07:46 PM #12
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12-08-2018, 06:31 AM #13
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The sensor is the measuring device at the transmission. The IP instrument panel or DIC digital instrument cluster has its own controller that can scale this signal or will bring in the scaled signal from the TCM depending on how this is accomplished. The digital readout is not like gages of old where today's readout can be filtered for stability or tailored to accomplish certain visuals such as a tachometer that seems to instantly drop on shifts. Or when all the gages go though an elaborate display to full scale than back to zero followed by the actual readings on key up. Today's cluster can be calibrated to display in a variety of ways where the output on the sensor may not in some cases be a linear relationship. Or a signal can be filtered to prevent the gage or digital readout from over reacting such as from fuel slosh. Since the reading is so different on the OP's truck, the aftermarket tool must be pulling from a different PID or there is simply an error in the tool. I would trust the IP on the truck. What is the stabilized operating temperature on the IP when towing? Does this number make sense? Does the aftermarket tool and the IP converge at the fully stabilized temperature when towing?
MidwestCamper
Jim & Dawn
Near Milford, Michigan
2017 Imagine 2600RB
2015 GMC Sierra 1500 Double Cab 4x4
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12-08-2018, 07:49 AM #14
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12-08-2018, 07:55 AM #15
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I think think the first thing I would check is the static temp of both readings. Let it sit over night and see if the temperatures are the same. When checking in the morning, check the ambient temp outside. If not close then something is not right. If one is close to ambient then that one is probably the correct one. It would be nice to do the static test in a very cold and a very hot climate and see if the temps track each other. Actually check all the temps available, they should all be close. If they are close to each other then they are probably different sensors. If they are not then close then it could be a possible PID formula that is not correct.
It looks like you might be using Torque Pro. If so, there is a place where you can look at all the different sensors that the app is reading and the PID as well as the formulas (If I remember correctly). This may also help with figuring things out.
Don't know if you use Android or iPhone, but check for different apps and compare results. It may identify errors of some sort.
PatLast edited by Gyro Gearloose; 12-08-2018 at 08:01 AM. Reason: Added a comment
Pat&Marlene Gyrogearloose - 2010 Itasca Meridian 34y - 6.7 w/Allison 6spd - Jeep Wrangler Rubicon - previous Reflection 303RLS
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12-08-2018, 08:05 AM #16
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I guess until we hear back from the OP we will be guessing....here is a TFT PID and equation for a 6.7 albeit an earlier year than the OP: PID=221e1c equation= ((SIGNED(A)*256)+B)*(9/80)+32 These numbers came from the FTE 6.7 forum and I didn't see anyone mentioning a discrepancy from the dash readout. To the OP, do the numbers match yours and are you using Torque Pro?
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12-08-2018, 02:25 PM #17
Transmission temps don’t match
No custom PIDs, and I don’t know how to edit them or check the PID settings. I’m just using default settings on Torque Pro app. DIC typically starts about ambient then displays transmission temp about 190 towing. Only recently noticed the transmission temp was much higher in Torque, so I don’t know the temps it shows during towing.
Tablet runs Android.
Sent from my iPhone using TapatalkResistance is Not Futile, It's Voltage Divided by Current.
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12-08-2018, 02:44 PM #18
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Ah ha! You need to be using the Ford Enhanced PIDs Set. Go to about 10:35 in the video and watch as Ron explains how to find them, then pick your gauges from that set, not the generic set. See if that works first, if you still have a discrepancy I can walk you through how to check the equations.
https://www.youtube.com/watch?v=9kjoWoYtZg4
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12-09-2018, 07:34 AM #19
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In case you already are using a TFT gauge from the Ford Enhanced set I believe there are 3 in there. When there are multiple choices on the gauges you can look for the one with the equation I posted earlier or simply use them all, side by side and figure out which one is correct for your rig then delete the others.
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12-09-2018, 07:59 AM #20
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I have an older 2008 F250. I attached a Bullet Proof Diesel ScanGauge II monitor to my truck. It is mounted on my dash. I have 4 visual readings on the unit.
1. Oil Temp, 2. Coolant Temp, 3. Trans Fluid Temp, 4. Air Intake Temp
I recently had a bed plate seal leak and while my engine was out of the truck I had everything upgraded. Bullet Proof Diesel Billet water pump and a new intercooler. I was told if you ever see the oil temp and the coolant temp are more than about 15 degrees apart, it is time to pull over and have the engine checked.
I think I would select one monitoring system, be it the built in gauges or the add on gauges and use it to monitor the engine/transmission temps.
My 397, finally
Today, 05:32 AM in General Discussion