GEN 2 Tyre rotation and TPMS sensor

[FordTechOne]

@FordTechOne, that process you quote may well be in the manual, and it has been quoted several times before in these forums, but I can guarantee you that I have never done it in my 2018 802A / Tech SCREW, and my truck knows where each tire is. I have well over 50,000 miles on my truck, I rotate the tires every oil change, and I try to change oil every 3000 miles. Sometimes I procrastinate and go a bit longer, so the average is probably something like every 4000 - 4500 miles. That means I have rotated the tires more than 10 times, probably something like 12+.

I have never done that procedure as outlined. In fact I have never "trained" my truck in any way as to tire location.

I run 36 lbs front and 33 lbs rear. During each oil change I set the tires to my desired pressures, meaning the now old rear / now fronts need to be brought up to 36 lbs, and the now rears brought down to 33 lbs. Immediately after tire rotation the dash indicator is, of course, wrong, showing the wrong pressures in the wrong places. But after some period of driving, in my case roughly 5 miles total, a couple miles before I get to town from the house, the tire locations and pressures are correct on the dash.

T!

As convenient as that sounds, it is simply not possible due to the way the system is designed. The TPMS sensors send out an RF signal which is received by the RTM. The RTM has no way of knowing where the RF signal originates; only the signal information, which is the sensor ID. The system is physically incapable of determining the actual TPMS sensor position.

Here is an example of running different front/rear tire pressures from the Workshop Manual:

It is necessary to train (calibrate) the TPMS sensors after a tire rotation on vehicles with different front and rear tire pressures. The BCM does not automatically recognize the sensor identifiers have been moved to different positions and retains the original position information for each sensor.

 

[62crew]

Friday I got a flat and dash said pressure for rear passenger tire 19 psi. I put the spare tire on and drove away with 19 psi still showing. About 5 miles down the road the tire pressure updated to 39 psi. When I first got my truck I added a tpms to spare for 5 tire rotation. No training involved.

 

[wheelman55]

FTO and fellow Raptor owners. My 2018 Raptor learns on it’s own. I run 32/28 most of the time and do a six a tire rotation...spares to front, front to rear, rear to spares. The truck figures out which tire is where after some miles are driven...I’ve not kept track of how many miles I’ve had to drive before the proper reading appear.

 

[pastorwug]

Consensus seems to favor the truck able to learn something.

 

[downforce137]

As convenient as that sounds, it is simply not possible due to the way the system is designed. The TPMS sensors send out an RF signal which is received by the RTM. The RTM has no way of knowing where the RF signal originates; only the signal information, which is the sensor ID. The system is physically incapable of determining the actual TPMS sensor position.

Here is an example of running different front/rear tire pressures from the Workshop Manual:

It is necessary to train (calibrate) the TPMS sensors after a tire rotation on vehicles with different front and rear tire pressures. The BCM does not automatically recognize the sensor identifiers have been moved to different positions and retains the original position information for each sensor.

can confirm... replaced my stock wheels with methods and new sensors and after a 20 min drive the truck relearned new sensor ID and also learned the correct positions.. never had to do a relearn..

as a matter of fact, i have a sensor in my spares and they relearn after rotated in...

 

[Ski4Ever]

Yep, I had my local tire shop put a TPMS in the spare, so I too do a 5 tire rotation on my 2019. When I rotate the tires, I never have to have the truck "learn" which sensor is where. It just automatically figures it out! I know @FordTechOne says it's not possible, and I've read about the procedure that "needs" to be done, but I have never done it.

 

[MnFlyer]

Add me to the list of “the truck doers it on its own”. I have a TPMS in my spare as well, truck knows exactly where each wheel is [4] after each rotation.

Matter of fact lemme go do an experiment.


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[MnFlyer]

Add me to the list of “the truck doers it on its own”. I have a TPMS in my spare as well, truck knows exactly where each wheel is [4] after each rotation.

Matter of fact lemme go do an experiment.


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So. When out to my truck


Front left pressure




Let the air out

Pumped it back up



I only moved the truck forward 2 feet since my hose wouldn’t quit reach in the driveway.

Tires wet just rotated about 500 miles ago, no learning process.

I suppose there is a chance that the front left tire is the “original” front left tire but I highly doubt it since that tire was replaced with about 5k miles on it and this tire is just as worn as the other front tire.


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[OriginalToken]

As convenient as that sounds, it is simply not possible due to the way the system is designed. The TPMS sensors send out an RF signal which is received by the RTM. The RTM has no way of knowing where the RF signal originates; only the signal information, which is the sensor ID. The system is physically incapable of determining the actual TPMS sensor position.

Here is an example of running different front/rear tire pressures from the Workshop Manual:

It is necessary to train (calibrate) the TPMS sensors after a tire rotation on vehicles with different front and rear tire pressures. The BCM does not automatically recognize the sensor identifiers have been moved to different positions and retains the original position information for each sensor.

@FordTechOne, you have brought some very good information to this forum, I have learned a lot from your past posts, but for whatever reason this time, at least in the case of my specific 2018 Raptor Crew Cab, you are not correct. Could the manual be addressing a differently optioned truck?

I am telling you I have never trained my system. I am also telling you that my dash display currently shows the correct tire inflation (+/- about 1 PSI) for each tire and in each location. I run different inflation front and rear so it is very obvious when the indicators are not right. It has shown the correct inflation each time I have rotated the tires after a short drive, typically it is correct in under 6 miles, but sometimes may take a bit longer, I suspect it depends on how many turns and stops are in the route.

It is not a matter of convenience, it is possible, and it is what it is doing. How it is doing it I have no idea, but it is and has every rotation.

To illustrate what is happening I made a video. I normally have my tires at 36 PSI front, 33 PSI rear. For the video I added a couple PSI to the left front and took a couple PSI out of the left rear. I then rotated the left side tires only, front to back, back to front.

I drove the vehicle, and as you can see in the video the pressures and locations start out incorrect, with the higher PSI tire on the front, and the lower on the rear. This is the previous (last drive) location of each of these tires. You can see in the video, about 35 seconds in, it ends up with the correct locations and pressures.

The second part of the video is me returning the tires back to their original locations, the left front is back on the left front, and the left rear back on the left rear, still at their changed pressures. This part of the video is the entire drive. The change occurs, the truck corrects the location of each tire, at about the 14 minute, 30 second point of the video. This is 10.6 miles into the drive, longer than average, but I drove a different route this time, with fewer stops and turns.

The video is here:

T!

 

[FordTechOne]

@FordTechOne, you have brought some very good information to this forum, I have learned a lot from your past posts, but for whatever reason this time, at least in the case of my specific 2018 Raptor Crew Cab, you are not correct. Could the manual be addressing a differently optioned truck?

I am telling you I have never trained my system. I am also telling you that my dash display currently shows the correct tire inflation (+/- about 1 PSI) for each tire and in each location. I run different inflation front and rear so it is very obvious when the indicators are not right. It has shown the correct inflation each time I have rotated the tires after a short drive, typically it is correct in under 6 miles, but sometimes may take a bit longer, I suspect it depends on how many turns and stops are in the route.

It is not a matter of convenience, it is possible, and it is what it is doing. How it is doing it I have no idea, but it is and has every rotation.

To illustrate what is happening I made a video. I normally have my tires at 36 PSI front, 33 PSI rear. For the video I added a couple PSI to the left front and took a couple PSI out of the left rear. I then rotated the left side tires only, front to back, back to front.

I drove the vehicle, and as you can see in the video the pressures and locations start out incorrect, with the higher PSI tire on the front, and the lower on the rear. This is the previous (last drive) location of each of these tires. You can see in the video, about 35 seconds in, it ends up with the correct locations and pressures.

The second part of the video is me returning the tires back to their original locations, the left front is back on the left front, and the left rear back on the left rear, still at their changed pressures. This part of the video is the entire drive. The change occurs, the truck corrects the location of each tire, at about the 14 minute, 30 second point of the video. This is 10.6 miles into the drive, longer than average, but I drove a different route this time, with fewer stops and turns.

The video is here:

T!

Thanks for taking the time and effort to create that video. In this case, it appears that the Workshop Manual is either incorrect or not updated for the newer models years. Sorry for the conflicting information. I’m interested in understanding how the system is able to determine the position of each sensor, that is impressive.