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post #1 of 25 (permalink) Old 12-05-2010, 02:20 PM Thread Starter
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Tire Light Issuse

i have a 08 Mazda.. and from time to time the tire light will come on and then go out... all tires are filled with the right amount of air. i was told it could be a module problem. what do you guys think? if it is where is it located? maybe i have a broken wire or a loose connection.. let me know asap
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post #2 of 25 (permalink) Old 12-05-2010, 02:34 PM
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I've had this problem for about a year now.... The Modules are located inside the tire and are wireless. The dealer claims that these things adjust after the correct tire pressure is driven on for a few miles. But I know first hand that this is not true. More than likely you need to take it into the dealer and see if they can shed some nonsense on this....

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post #3 of 25 (permalink) Old 12-05-2010, 05:52 PM Thread Starter
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isnt there a computer for the system? when i got the car they said it was a module problem.. im a mechanic so i have a idea how it works..
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post #4 of 25 (permalink) Old 12-06-2010, 02:07 AM
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I've read that you can see your TPMS system on OBDII, but I have no idea which reader can was used.

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post #5 of 25 (permalink) Old 12-06-2010, 07:50 AM Thread Starter
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i have a good feeling its something really dumb... i hate seeing the damn dummy light come on and off. could it because the car has a set of matching tires in the front and rear are another matching set? both sets are stock size tho..
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post #6 of 25 (permalink) Old 12-06-2010, 09:24 AM
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I took this into consideration because I have the stock rims but my when I replaced the stock tires, I replaced them with a slightly wider performance tire. I'm unsure of the actual size but its not stock. So the bigger tire means there is going to be more internal area inside the tire, with that in mind, I assume that the Tire pressure inside the tire is going to be slightly less than the original smaller tires.

My logic is this. take a square table and put 32 pounds evenly distributed on it. Take a larger square table and put the same 32 pounds evenly distributed on it as well
Which one feels lighter? If the tables are equal weight, then the second one should feel lighter because the weight is distributed over a larger area.
The same concept should apply to the inside pressure of the tires.

Maybe I'm completely wrong about this concept. Someone with knowledge of Physics is probably yelling curse words in German at the computer as they read this.

Either way, I have learned to live with the dummy light for the time being. Sometime soon, before I have to go back to school, after winter break, I am going to take it into the 'stealership' and try and get this issue solved once and for all... Until then, this is all the light I can shed on this issue....

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post #7 of 25 (permalink) Old 12-06-2010, 09:34 AM
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But as for the different tire sizes, The car knows no difference, as long as the internal pressure is what Mazda set it at, there should be no light.
My ultimate hypothesis is that there is one or more malfunctioning sensor..

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post #8 of 25 (permalink) Old 12-06-2010, 11:18 PM Thread Starter
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it needs a $663.16 tpms module.. the ecu for the tpms is bad... so the fix is gonna be tape on the cluster to block it or take the bulb out.. its like parts+labor so its like 1200 bucks eff that.. o well
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post #9 of 25 (permalink) Old 12-06-2010, 11:36 PM
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what do you mean the ecu for the tpms? is it just the tire pressure sensor in the wheel, or are they saying theres another computer in the car thats bad? honestly that price sounds out of control, can't they replace it under warranty? it's almost new. if its just a sensor it cant be that much. i've replaced tons of them and never seen a $663.16 tpm sensor come through the door.
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post #10 of 25 (permalink) Old 12-07-2010, 07:07 AM Thread Starter
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yea there's 4 sensors in the wheels and they report to a module in the dash behind the radio.... the dealer said it was bad and showed me the alldata sheet on how to replace it... yea the sensors have to report to a ecu to tell the light when to come on and go off. i got it at a Toyota dealer and it has 60k on it so cant do it under warranty. which blows
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