Tire Presure Monitoring System (TPMS) question

If the car is off the whole time, and you dont rotate the tires, you probably wont have to reset it.

 

I believe you should reset it, according to what the dealer told me. (Of course they could be wrong), but what was stated if you reset your tire pressures as you stated, you should also reset the TPMS to have a set point for the new pressures.

Guess I will have to do some more research as well, since this is a good question.

But from what I was preliminarily told, you should reset it since the old set point is still applicable??

Hmmmm

 

You dont have to reset it. But it will still be left with the lower pressure threshold. So if you are more worried about maintaining a high pressure more than just detecting a slow leak, then you should reset it. The sensors also have a maximum pressure rating, I just cant remember what it is, around 45psi I think.

 

Since you are changing tire pressure, you should to reset it. It's no big deal--press and hold the button until the light on the dash blinks 3 times.

 

I believe the warning goes off when you drop like 10PSSI.

The recommendation I saw elsewhere is to inflate to like 48, reset the TPMS sensors, then go to your 42/40 - this way you get a real notification...

 

Most pressure sensors work only within a certain range, like 20 to 35 lbs, or 25 to 45 lbs. If the pressure is outside the low end of the range it trips the return signal circuit. I dont know about Toyota, but they probably work the same way. But I dont know what the range is.

 

This has been discussed here before--try a search. My recollection is it triggers if the pressure drops X% below where it was set.

 

I thought the dealer informed me the threshold was 8 PSI??

I did have a bad seal on a new tire when I took delivery of my 2010, and the next morning when starting the car the TPMS light was on.

I checked the tire pressure and it was 24 PSI, so I believe it was set at 32 as the other tires were originally set at delivery.

So maybe the 8 PSI was the threshold as they stated, but can't confirm from any written documentation.

Also, like Rrolff's Idea! Will try that.

Note: When the tire was taken off and resealed on the wheel the TPMS went off, they did not have to reset it.

 

The TPMS will trip when pressure falls 25% of the set pressure. So, if set at 32psi when any tire drops to 24psi the idiot light comes on. Increasing the pressure to 42psi doesn't reset the sensor. It will still trip at 24psi. Reset the sensor and it trips at 31.5 psi.

 

Thanks for the explanation...Makes great sense...

So increasing the tire pressure 5-10 PSI makes good sense to reset the TPMS....

Thanks for the info!

 

Re: Tire Pressure Monitoring System (TPMS) question

I was in Wal-Mart earlier and a sign listing their services stated resetting the tire pressure monitoring system would cost $20. Probably because it takes them 30 minutes to look it up in the manual.

The system has already saved me twice with slow leaks due to nails and was able to make it to Sam's (where flats are free) before the spare had to be used.