Low tire pressure warning - Mazda CX3 Forum
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post #1 of 23 Old 01-12-2018, 04:50 PM Thread Starter
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Low tire pressure warning

Hi Everyone,

So the little Low Tire Pressure Warning icon came on for the first time a few months ago, when we got the first cold spell; at that time, I took it to the dealership and they told me it had to do with the temperatures dropping and was nothing to worry about. Ok, fair enough. I guess they turned it off.

Then a few weeks ago, when it got REALLY cold, it came on again, so we checked the pressure and it was slightly low in some tires, so we added some air - but the warning stayed on! So I checked the pressure again (was wasn't easy to do since pretty much ALL air thingies at the gas stations were out of order!!) but when I finally found one that worked, it said that all the tires were fine...Oh well, I thought, maybe it's just because of the cold so ignored it.
However, it is now 60 degrees here and the warning light is STILL on??? WTH ?? Does anyone know what this is all about? How can I get it to turn off?

Thanks for your help/advice!

Kat

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post #2 of 23 Old 01-12-2018, 05:16 PM
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Hi Kat, I had the same issues with my 2018 GT when I first got it. First, keep the car in the garage so the tires settle down temperature wise. Fill them up so they at the correct pressure settings. Then follow the instructions in this video to reset the TPM, it will use the current pressure as a calibrated starting point when you do this, so be sure to have the tires set at the right pressure before you do it.

If you don't have a way of putting air in the tires with them "settled down" you can still do this of course.

My old Mazda 3 always lost pressure in sub-zero temps as well. Didn't matter if the tires were OEM or oversized, those rims always leaked. I kinda expect the same from my newer CX-3.

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post #3 of 23 Old 01-12-2018, 05:32 PM
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The TPMS in the CX-3 is based off of the ABS system. It watches the wheel speed sensors to see if any of the wheels are turning slightly faster or slower than the others.

When you reset the system, you are telling the system "the pressures are correct, remember these relative rotation rates."

I think the standard for detection is 20% in 20 minutes (or pretty close to that). That is, the system has to warn the driver within 20 minutes if one tire changes by more than 20%.

The annoying side effect of this is that if you drive one tire over a bump under power, and that wheel bounces off the ground, it will spin a bit faster than the rest until it comes back down. Since the system knows that the brake isn't applied, it thinks that one of the tires has gone flat. (Edit: This is just a theory but it would explain why people get TPMS warnings after going over bumps.)

Another side effect of this is the gas laws. Pressures will change roughly 1 psi for every 10F. However, as long as all the tires change at the same rate, the system probably won't know because all of the tires should still have roughly the same rotation speed relative to each other.

If you've reset the TPMS and you're still getting warnings, it's possible that one or more of a few things have happened:

Quit flooring the gas over bumps... (j/k)

There's a problem with one of the tires that nobody has found yet.

User error. I trust you can follow directions but maybe you made a mistake.

Last, I read on here somewhere (but can't find it anymore) that if you try to reset the TPMS more than 2 or 3 times in a single drive, it will assume a system malfunction and only the dealer can reset it after that.

I recommend you get a $10-$20 dial-type tire pressure gauge and leave it in the glove box. I hate the stick type and never trust the ones at the gas stations.
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post #4 of 23 Old 01-13-2018, 04:25 AM Thread Starter
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Hey great info, thanks!!
I'll get a tire pressure gauge, that's a great idea (I think we may actually have one, but I have no idea where and how good it is. Probably not great...)

So I haven't tried resetting the TP...whatchamaycall it yet. I didn't know I could do this - I thought the light was supposed to turn itself off or the dealership would have to do it. I'll watch the Youtube video, but first I guess I will check the tire pressure yet again...

Will keep everyone posted!

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post #5 of 23 Old 01-13-2018, 04:29 AM Thread Starter
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Wait - so there is one simple button somewhere??? The car in the video looks very different from mine, where is it in the CX=3??

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post #6 of 23 Old 01-13-2018, 11:21 AM
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Quote:
Originally Posted by Katrin Knauer Mellody View Post
Wait - so there is one simple button somewhere??? The car in the video looks very different from mine, where is it in the CX=3??
Down on that little panel near your knee. Press and hold it until it beeps but ONLY after you make sure the tire pressures are OK. If you keep resetting it, it will assume you are attempting to ignore a soft tire and lock you out so only ever do it once after checking the tires.
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post #7 of 23 Old 01-13-2018, 02:32 PM Thread Starter
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Great advice, thanks!
Do you perchance have a recommendation for a good home tire pressure gauge and inflator? I know nothing about these things, but I do know it's a pain going to the gas station machines so would like to have a good one at home!

Also, how often would you recommend rotating the tires? We've had the car about 6 months now, does it need to be done? Would the dealership do this for free?

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post #8 of 23 Old 01-13-2018, 05:33 PM
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Quote:
Originally Posted by anchorman View Post
Down on that little panel near your knee. Press and hold it until it beeps but ONLY after you make sure the tire pressures are OK. If you keep resetting it, it will assume you are attempting to ignore a soft tire and lock you out so only ever do it once after checking the tires.
Yep, I had my TPMS triggered when going over some rough roads in the fall. Checked all the pressures, everything was fine. Did the reset and it hasn't come back on since.

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post #9 of 23 Old 01-14-2018, 12:37 AM
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If you own a car, you should also own a quality pressure gauge AND a small compressor. When buying tools of any kind, it pays to buy quality. Here’s the best pressure gauge I’ve ever owned. It’s analog (preferred) with a handy bleeder valve. So the fill procedure is to over fill the tire on the first pass, then bleed the pressure down to EXACTLY the pressure you want. Saves time from back and forth with gauge and air filling and gets a nice accurate fill every time. For a garage compressor, I recommend the Porter-Cable 6 gal “pancake” compressor at $99 as found at Home Depot. Ladies, these make wonderful birthday, Fathers Day, Christmas or even Valentine’s Day gifts for boyfriend/ Hubby. These are must haves for anyone’s garage.

https://www.tirerack.com/accessories/detail.jsp?ID=166

https://www.homedepot.com/p/Porter-C...2002/203162815
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post #10 of 23 Old 01-14-2018, 02:56 AM
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Originally Posted by Indydriver View Post
Ladies, these make wonderful birthday, Fathers Day, Christmas or even Valentine’s Day gifts for boyfriend/ Hubby. These are must haves for anyone’s garage.
They also make great gifts for women who care about their cars.
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