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Old 11-08-2020, 12:13 PM   #61
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Originally Posted by U.S.ArmyVeteran View Post
If your TPMS came stock in the car it is not attached to your valve stem. I have never seen that. I have had TPMS system on my vehicles since 2000. Of course I have been wrong once this year already lol
My car came stock and the TPMS sensor is the valve stem.
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Old 11-08-2020, 12:33 PM   #62
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Originally Posted by U.S.ArmyVeteran View Post
If your TPMS came stock in the car it is not attached to your valve stem. I have never seen that. I have had TPMS system on my vehicles since 2000. Of course I have been wrong once this year already lol

I started working with OE TPMS in 2001 and saw systems from GM, MB, Toyota, Honda, Chrysler, Ford, Subaru, Nummi, and Mazda. All of them had the tpm sensor as part of the valve assembly. None of them had replaceable batteries as the battery was sealed into the valve/sensor part.


In '08 after retiring I purchased an aftermarket TPM from Hella but it was a Passenger unit and didn't work at the pressures I needed in my Class-C. I bought a TireTraker system in '09 and "never looked back" I mark the date on the batteries when I install them and find that most last for 2 years. Other than a battery dying I have had no problems. I do carry a couple spare batteries so if/when I get a lost signal report I can quickly change the battery at the next stop.
The monitor TireTraker now sells comes with lifetime warranty and I feel the cost of batteries is "pocket change" when it comes to normal maintenance. I did transfer my system to my new coach in '16 and the Traker is still working fine.
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Old 11-08-2020, 01:05 PM   #63
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No Sensor

[QUOTE=Tireman9;2447344]I started working with OE TPMS in 2001 and saw systems from GM, MB, Toyota, Honda, Chrysler, Ford, Subaru, Nummi, and Mazda. All of them had the tpm sensor as part of the valve assembly. None of them had replaceable batteries as the battery was sealed into the valve/sensor part.

My '09 VW has sensors in the valve assembly as well. I replaced them last year because the batteries died. Interestingly, I got a low tire warning on my '19 VW and it showed which tire, but not the pressure. I was looking at the tire while at the tire shop and couldn't find the sensor. I was told that there was no sensor, that the anti lock brake system computer could tell when a tire was rolling at a different rate than it should and it controlled the warning light. I suspect it measures rolling resistance rather than rate, but that is what I was told. Anyway, the tire has no sensor at all.
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Old 11-08-2020, 01:26 PM   #64
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[QUOTE=mharrel;2447352]
Quote:
Originally Posted by Tireman9 View Post
I started working with OE TPMS in 2001 and saw systems from GM, MB, Toyota, Honda, Chrysler, Ford, Subaru, Nummi, and Mazda. All of them had the tpm sensor as part of the valve assembly. None of them had replaceable batteries as the battery was sealed into the valve/sensor part.

My '09 VW has sensors in the valve assembly as well. I replaced them last year because the batteries died. Interestingly, I got a low tire warning on my '19 VW and it showed which tire, but not the pressure. I was looking at the tire while at the tire shop and couldn't find the sensor. I was told that there was no sensor, that the anti lock brake system computer could tell when a tire was rolling at a different rate than it should and it controlled the warning light. I suspect it measures rolling resistance rather than rate, but that is what I was told. Anyway, the tire has no sensor at all.

Yes I was only talking about "Active" systems that actually measure tire pressure. Some car companies like VW had "passive" systems that used the ABS sensor and computer logic to compare RPM of tires. The assumption was that both tires on an axle would not lose air at the same time.
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Old 11-08-2020, 02:09 PM   #65
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[QUOTE=mharrel;2447352]
Quote:
Originally Posted by Tireman9 View Post
I started working with OE TPMS in 2001 and saw systems from GM, MB, Toyota, Honda, Chrysler, Ford, Subaru, Nummi, and Mazda. All of them had the tpm sensor as part of the valve assembly. None of them had replaceable batteries as the battery was sealed into the valve/sensor part.

My '09 VW has sensors in the valve assembly as well. I replaced them last year because the batteries died. Interestingly, I got a low tire warning on my '19 VW and it showed which tire, but not the pressure. I was looking at the tire while at the tire shop and couldn't find the sensor. I was told that there was no sensor, that the anti lock brake system computer could tell when a tire was rolling at a different rate than it should and it controlled the warning light. I suspect it measures rolling resistance rather than rate, but that is what I was told. Anyway, the tire has no sensor at all.
No, I think 'rate' is correct. A tire of a given diameter is going to be rotating at a known RPM at any given speed. If the tire loses air, its diameter gets smaller and has to rotate faster to keep up with the other 3. Since there is already a sensor at each wheel monitoring its rotation (so the computer can tell if one locked up), it would be simple to compare each wheel to the others and display an alert if one is x% faster than the others.
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Old 11-08-2020, 03:22 PM   #66
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Originally Posted by U.S.ArmyVeteran View Post
If your TPMS came stock in the car it is not attached to your valve stem. I have never seen that. I have had TPMS system on my vehicles since 2000. Of course I have been wrong once this year already lol
Stock Ford TPMS



Been in use for at least 10 years. Some earlier ones were the strap on ones, but many of them have switched over to the stem types, much easier to replace if needed, just need to break on bead to get to them.
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Old 11-09-2020, 07:22 PM   #67
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Yup, that looks similar to what I saw at the tire store. Thanks! FWIW, they want almost as much to replace the batteries/sensor as the tire costs!
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Old 11-09-2020, 08:52 PM   #68
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Originally Posted by Bhrava View Post
Stock Ford TPMS



Been in use for at least 10 years. Some earlier ones were the strap on ones, but many of them have switched over to the stem types, much easier to replace if needed, just need to break on bead to get to them.



One main reason for this type of TPMS rather than the stem mounted bolt on seen on most cars in 2000 - 2015. I think GM was the first but may be mistaken on that.
This style can be installed by a simple "robot" at the mounting facility similar to the way old fashioned "Snap-in" TR413 rubber stems were mounted.
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