TPS sensor

[emonette123]

I bought cheap TPMS on Amazon, supposedly compatible with F2GZ-1A189-D model, which is what my Mach E 2023 is equipped with. I finally got them to work and wanted to share my experience, if it can be helpful to people not wanting to pay 8X the price at their Ford dealership.

First of all, these TPMS will not be automatically recognized by the car. You have to manually make the car relearn them.

Second, there are 2 relearn procedures on the Mach E, one static using the hazard button. Static means it will not learn new TPMS ids, only new TPMS positions. The complete relearn procedure is accessed through the break pedal and push to start button dance. This procedure will learn new ids. This is the procedure to use when you have 2 sets of TPMS, unless you cloned the second set. Why won't Ford make these relearn procedures accessible from a menu on this gigantic screen, I really don't know!

Finally, you need a good tool to reset your TPMS sensors for the relearn procedure. I bought the small grey rectangular one with the green button and it did not work for me. I had to use the full blown Schrader TPMS programming tool in order to successfully complete the relearn procedure.

And it worked, I now have functional TPMS on my winter tire set, for less than 50$ for 4 TPMS sensors. Compare this to 80$ for 1 TPMS at the Ford dealership...

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[Tbird]

Does this mean that when my tires are rotated I have to do a relearn for position? or is that automatically done by the car?

 

[Teslaeata]

As long as the TPMS sensors are compatible, the car will automatically learn the new sensor IDs after you drive around for a bit. But if you want the location of each tire to be accurate, you'll have to do a position relearn. Details here:

https://www.macheforum.com/site/threads/got-my-new-wheels-for-winter.5300/post-152039

Position’s a self-learn

 

[generaltso]

Position’s a self-learn

Yes, a lot has been learned in the years since the post that you quoted.

 

[emonette123]

Yes, a lot has been learned in the years since the post that you quoted.

I am curious how a car could learn the position of a TPMS sensor. The TPMS emits a radio signal at 315 MHz and the range of that signal is roughly 10 feet. The ECU of the car, located near the car's dashboard receives that signal and displays it. The data exchange is pretty simple and is roughly an ID and a pressure reading.

In order for the central ECU to detect a position on the signal, I only see time of flight differences on the different TPMS signals. This difference will be infinitesimal and I doubt the ECU could even measure it. It also implies a 2 ways communication between the ECU and the sensors and I am confident the ECU is only a receiver.

I think you have to do a static relearn when you rotate your tires, which means hit the hazard button 6 times when in accessory mode on the car. Then follow the procedure on screen.

I just do not see how a car could automatically detect the position of a given TPMS ID.

 

[emonette123]

I just do not see how a car could automatically detect the position of a given TPMS ID.

To reply to myself: a directional antenna would do the trick. Maybe the ECU has a directional antenna which would enable it to roughly assign a position of front left, right and rear left, right to a signal.

 

[generaltso]

To reply to myself: a directional antenna would do the trick. Maybe the ECU has a directional antenna which would enable it to roughly assign a position of front left, right and rear left, right to a signal.

Could be. I don't know how it works in Fords, but it's been tested enough at this point to know that it definitely does automatically update position.

 

[GreaseMonkey]

Could be. I don't know how it works in Fords, but it's been tested enough at this point to know that it definitely does automatically update position.

I wonder how the search function seems to be working all of a sudden working for these oldies but goldies to be popping up!

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