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Old 10-18-2015, 01:58 PM
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How do Tyre Pressure Sensors Work?

We're in the market for a Jeep Grand Cherokee. On Friday the sales person showed me some of its functions. In this case, the tyre pressure readout on the dash was an interesting feature.

However, I forgot to ask how they work. Perhaps someone here can give us the lowdown.

I understand that there's a radio link from each tyre to the readout. However, what powers the sensors and how long do they last?

I'm guessing that they're located within the valve stem.

Thanks

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Old 10-18-2015, 02:35 PM
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Yes part of valve stem assembly all US vehicles sold after 2007 must have them. They run off of batteries that are supposed to last 5 to 12 years with an average of 7 years if I remember correctly.

I have actually found them to be very accurate 3 of mine match my tire Guage exactly and one of them is about .5 lbs off not bad and you can't ask much better than that
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Old 10-18-2015, 10:02 PM
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Re: How do Tyre Pressure Sensors Work?

Thanks. When we looked at one the other day the display was in bar. I presume that you can alternate between bar, psi and kpa? I prefer psi for tyre pressures but metric for most other things.
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Old 10-18-2015, 10:14 PM
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Quote:
Originally Posted by mjt57 View Post
Thanks. When we looked at one the other day the display was in bar. I presume that you can alternate between bar, psi and kpa? I prefer psi for tyre pressures but metric for most other things.
My 2014 reads in psi, you can probably change it same as you can change the temp from F to C if you want.
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Old 10-18-2015, 10:34 PM
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Re: How do Tyre Pressure Sensors Work?

When you set the menu to show metric units it will show all metric measurements: Kph (speed), Celcius (temp) and Bar (tyres). Some owners have kPa instead of Bar. This may be later models ?? Unfortunately you cannot have mixed readings (kph and psi).

The TPM system can detect which corner the wheel is located as there is a detector in each wheelarch.
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Old 10-19-2015, 05:58 AM
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Re: How do Tyre Pressure Sensors Work?

Thanks Mozzie

The model which we are getting is a 2015 GC Limited. I didn't get a chance to fiddle with it. But the saleswoman said that it only displays in bar. I just have to get used to that unit of measurement I s'pose.




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Old 10-20-2015, 02:40 PM
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Re: How do Tyre Pressure Sensors Work?

This is what they look like

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