"D.Duck" wrote in message
...

"Eisboch" wrote in message
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"Gene" wrote in message
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Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
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Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation time
of each tire compared to the others. If a tire is low, it's number of
rotations for a given speed, compared to the other tires will increase.
That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning. I
have two Buick Lucernes and the newest actually reads out the PSI for each
tire, the older gives a low warning without telling which tire is actually
low. The older system is the one that I understand measured wheel
rotation.

I was unaware of that. Learn something new everyday. It is my
understanding however that most of the tire pressure monitoring systems are
of the type I described.

Eisboch