tyre pressure warning

[coltmanneil]

Hi,

New to this site as ive not had my yaris 2018 1.0L long. I have a tyre pressure warning light on. I know how to reset it but is there a way of reading which tyre is causing the problem.

 

[Bernard Foy]

Depends on the specs  my Yaris 19 didn't have it so I just had to check each individual wheel with a good quality tyre pressure gauge, the the important thing is don't ignore it and the pressures checked asap.

[Hadrian1]

Our 21 Yaris doesn't specify which wheel either.

[coltmanneil]

So if the pressures are all ok it sounds like a sensor problem and theres no way of knowing which ones playing up. 

[Bper]

An advanced scan tool should show which one is faulty, unless you have access to one a tyre centre will tell you.😃

[Mojo1010]

What happens to using a tyre pressure gauge? 

[Cyker]

4 hours ago, Hadrian1 said:

Our 21 Yaris doesn't specify which wheel either.

It should, all the Mk4's have that ability! If you use the steering wheel controls to get to the bit that shows power flow, one of the 3 sub displays will show each wheel's pressure. I often switch to it when I've hit a particularly nasty pothole just to see if the tyre starts loosing pressure!

[Guest]

17 hours ago, coltmanneil said:

Hi,

New to this site as ive not had my yaris 2018 1.0L long. I have a tyre pressure warning light on. I know how to reset it but is there a way of reading which tyre is causing the problem.

 

If you do reset it and one or more of the tyre pressures are outwith the warning differential it will only show again.

As Mojo questions, check the pressures with a gauge. You do that along with their condition regularly don't you?

[MardyMarvin]

i got fedup with my tyre pressures always moaning as they are so sensitive. If its a colder morning they will complain as its drop a couple of PSI.

I have thought about letting the tyres down to a pressure I would class as flat and then setting the pressure to that in the car then inflate them to what they should be and see if that fixes it complaining so quickly. But not sure if they would just do some sort of auto reset on the pressure eventually.

[Big_D]

I pump mine to 31psi, set the TPMS and then pump them up to 33psi, which is the recommended pressure. Works for me.

[Gren]

if you swap the wheels around, is there a way to reset the system to recognise the new wheel positions?

[Mojo1010]

Have swapped front to back on the MK3 and nothing needs doing though there wasn't an individual pressure indicator. Would assume nothing needs doing on the mk4 also, but haven't done it so don't know for sure. 

[dash]

Latest 2024 mk4 monitors each wheel independently, so the system needs to know location of each sensor. This is easily set in the TPMS settings menu.

[Cyker]

4 hours ago, Gren said:

if you swap the wheels around, is there a way to reset the system to recognise the new wheel positions?

You shouldn't need to do anything - When you turn on the car, it starts pinging each of the TPMS sensors to figure out which one is on what wheel; That's partly why it will only show --- for a couple of minutes before displaying the pressures.

My wheels usually get all mixed up every time I get new tyres (I used to identify them visually by the pattern of kerbing marks on my old cars  ) and I've never had to reset anything for my Mk4 to figure out what wheel is where.

Once the sensors have been coded to the car, the only reason to do a reset is to set the desired pressure threshold for the warning.

[dash]

The car needs to be told which sensor is where. My wheels were switched and I had to go into settings (after a couple of days) to assign the sensors to the wheels.

[Cyker]

That's weird, I don't think I've seen such a menu on mine

Mine just seems to do it itself automatically...!

How do you assign the sensors to wheels, does it show a list of their hardware IDs for you to select...?

[dash]