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  #1  
Old 02-04-2011, 06:56 AM
RainmanX RainmanX is offline
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Default How does the Tire Pressure System work?

Yesterday I had an error that one of my tires was low. I took it to the dealership (I had them fill with nitrogen), and the filled it (33/34) all around. It took a half hour/6 miles or so before the warning light went out.

So how does it work? What happens when the tires are rotated? Is the spare monitored?

Thanks!
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Old 02-04-2011, 07:02 AM
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last week during so cold weather (3 degrees), the tps was all errors,
i checked tires, put a few lbs in them, drove a couple or 3 miles, no more errors.

whats this about using nitrogen, why?
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Old 02-04-2011, 07:24 AM
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My light comes on a good bit in the winter, especially lately with this crazy cold lol, and I don't remember what psi the sensors are set for, I think mine are 32 psi, you can find that out in your owner's manual, but the light will stay on until either you air the tires up or they warm up from driving, either way, until the low pressure condition is no longer present. As for the spare, that's a good question and I don't honestly know if they come equipped with a sensor or not, I just check mine regularly when I check the rest. How is the nitrogen working for you, don't know too many folks who actually do it?

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Old 02-04-2011, 07:24 AM
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Sensors in the wheel monitor pressure and transmit the info to the TPMS module which in turn sends the info to the cluster to display low pressure info. Some models monitor the spare, some don't. No reprogramming is needed when the tires are rotated, but it can take up to 10 miles of driving for the module to learn the new position of each sensor. IMO, the cost of nitrogen outweighs the benefits.
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Old 02-04-2011, 07:27 AM
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Good explanation Randy, very helpful as always!

- Cajun
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Old 02-04-2011, 07:37 AM
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Some of the sensors are simply possessed! I fail to understand why different wheels will "alert" at different pressures. To my way of thinking, everything should be set for the same pressure. My left front will start alerting about 30 psi, and it won't go off until I've aired it up to around 45-35psi. The other 3 will alert around 27 or 28, and will go off when increased to around 33psi. I don't get it.

Yesterday, all four tires were showing 32psi in the EVIC, yet the left front was the only one showing an alert.... Having the sensors recalibrated at the dealership and rotating the tires has no effect... it's always the left front. I've been told at least twice that there is nothing wrong, and that they sensors are set for around 45-35 psi.

One of these days I'll simply have to perform an exorcism.

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Old 02-04-2011, 08:00 AM
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The module is programmed to alert at a preset pressure. Unfortunately there is no calibration procedure to set the pressure transmitted by the sensors.
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Old 02-04-2011, 11:49 AM
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for the guy asking about nitrogen. my understanding of it all is that nitrogen does not compress or expand like air and is made up of bigger molecules so it doesnt leak out thru the tire. not a rocket scientist here but thats the gist of it i think. someone on here a lot smarter may be able to explain it better. it is expensive to have it done but they say you get better mpg, longer tire life, more even wear etc. i dont know that there really is a big enough difference for the cost.
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Old 02-04-2011, 11:54 AM
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Quote:
Originally Posted by heffs03mach1 View Post
for the guy asking about nitrogen. my understanding of it all is that nitrogen does not compress or expand like air and is made up of bigger molecules so it doesnt leak out thru the tire. not a rocket scientist here but thats the gist of it i think. someone on here a lot smarter may be able to explain it better. it is expensive to have it done but they say you get better mpg, longer tire life, more even wear etc. i dont know that there really is a big enough difference for the cost.
That's pretty much it in a nutshell. I prefer to spend a few dollars on a tire pressure gauge and get off my ass and check the tires once a month than to spend $30 + on something that won't last the life of the tire.
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Old 02-04-2011, 09:07 PM
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the spare doesnt havethe sensors in it, and mine did the same thing and i just filled them up to 35psi cause its like 11 degrees in the mornings here in pa
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