Air pressure on TPMS - Toyota RAV4 Forums
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#1 (permalink) Old 12-12-2012, 04:21 PM
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Air pressure on TPMS

I was trying to find out at what PSI will set off TPMS? I search through this forum and only came up with a guess of 26 PSI. Mine went off and I check tires
and came up with 24, filled to 30 and light went off. I only asking because during winter months out here I try to run my tire at 30 or 28. To me this helps with traction, when summer comes around then 32 is where I run. So if any one knows the right answer to when your air pressure drops to ___psi then TPMS lights up.

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Last edited by dtalk; 12-13-2012 at 07:17 PM. Reason: spelling
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#2 (permalink) Old 12-13-2012, 12:36 AM
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mine went off at 23psi. It has gotten down to 27psi and not triggered it. I have a 2009 base model
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#3 (permalink) Old 12-13-2012, 01:01 AM
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Yesterday mine went off @ 27.5, and it was just my spare.

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#4 (permalink) Old 12-13-2012, 06:43 AM
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The sensors will generally go off if the air pressure is down 25% from whatever pressure the sensors are set for. If the sensor is calibrated for 32psi then the light will come on at 24.
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#5 (permalink) Old 12-13-2012, 08:39 AM
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It should be TPMS....Tire Pressure Monitoring System by the way. I agree with the above @ 25% loss of air.

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#6 (permalink) Old 12-13-2012, 09:15 AM
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Seems stupid the TPMS systems does not fire off an alert for a reductions of 2% psi or more... what the value of a warning system that lets you drive around with almost 10 psi less in your tires...?? You can have real issues with this , like a blow out or excessive wear in certain areas of the tread...
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#7 (permalink) Old 12-13-2012, 09:45 AM
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Quote:
Originally Posted by jdiru View Post
Seems stupid the TPMS systems does not fire off an alert for a reductions of 2% psi or more... what the value of a warning system that lets you drive around with almost 10 psi less in your tires...?? You can have real issues with this , like a blow out or excessive wear in certain areas of the tread...
They want to give the driver a little latitude. Some drivers may want to run at 29 psi and others at 37 psi. A threshold of 2% would be ridiculous--the light would be on so much that it would be ignored.

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#8 (permalink) Old 12-13-2012, 10:17 AM
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They want to give the driver a little latitude. Some drivers may want to run at 29 psi and others at 37 psi. A threshold of 2% would be ridiculous--the light would be on so much that it would be ignored.
Agreed. The ones I use on my truck & trailer alarm on high or low. I've had to extend the alarm range to keep them happy.
2% is waaaay less that the normal variation just from parked overnight to driving in the summertime. I'd bet we'd see a 5 psi variation every day on our RAV4s if we had a readout like I do on my Pressure Pro system. That's 16% right there w/o even throwing winter temps in - and probably the reason we don't get a readout. Would be too much data. Imagine all the calls to the service departments. They already get so many every winter that people want them bypassed rather than having to add a little air.

Same reason ammeters & voltmeters disappeared on cars years ago. Useless & confusing data as long as the car runs.
So now we have "idiot" lights - you know like the RED oil one that indicates add oil.

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#9 (permalink) Old 12-13-2012, 10:18 AM
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If you are running any type of air, nitrogen, compression in a tire, it is your job to check the actual pressures within your tires on a regular basis and not rely on a monitor, light system.

Are we too lazy to check these things out? No different than the engine oil, let the light tell us to test it for the correct amount?

Let's face it there are many things to check with a car and it is our responsibility to test and check these things on a regular timely basis and use the monitors as they are intended but not rely on them.

The cars of today are well built and sold with hype about how easy maintenance is. People want more car but less maintenance and the makers are doing just that, but reality dictates LOOK AFTER IT by checking fluids, pressures, dipsticks etc
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#10 (permalink) Old 12-13-2012, 10:52 AM
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What is the best pressure to run at that won't wear the tires unevenly?

2010 Toyota RAV4 V6 AWD Sport-Sport, Magnetic Grey/Charcoal, Extra Value Pkg, Sport Appearance Pkg, Tow Pkg, BlueLogic hands free
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