Tyre deflation warning constantly coming on.

[Kremmen]

Spot on

As the new tyre wall beds in and softens it does trigger the TPMS a few times

Should take about 300 miles

[Lord Voltermore]

Spot on

As the new tyre wall beds in and softens it does trigger the TPMS a few times

Should take about 300 miles

This is also the reason why odd makes of tyre can sometimes give false alarms. Some tyre walls are more flexible than others. And may heat up at different rates, affecting air pressure.  Even the same brand and model of tyre sometimes come in standard and  XL (extra load) versions ,or different speed ratings etc  that might affect side wall flexibility.

[Webley]

Check you haven't got a sticking brake caliper.
This can cause the TPMS to trigger as it works off the speed sensors.
Had this with our HRV when we first got it.
Changed the pads and flushed the brake fluid ,problem solved.

[TnTkr]

Could you please elaborate how the sticking brake caliper affects to the wheel speed sensors.

[edam]

I have had problems with TPMS when driving on one section of the M25.
This is where they had changed to a "smart motorway".
So when driving in lane 1 the nearside wheels were running on the old hard shoulder whilst the off side was on the normal surface.
This difference in road surface seemed to upset the TPMS

[Kremmen]

I used to drive the M25 daily and never had a problem

I still believe the initialisation is important

The advice was to perform a half hour drive taking in left and right corners, various speeds and road types.

My 20 mile journey to work was perfect as it took in A roads, B roads, 2 Motorways and various speeds and took 40 mins.

I've seen posts where some have performed the initialisation in a number of short journeys which in my view may cause issues

[ColinB]

Most of the reports of false alarms seem to involve motorways, which makes me wonder whether the calibration process is being carried out diligently. The handbook advises you should get up to high speed during the calibration period. If you don’t, and just pootle around at 30-40mph, then the system isn’t seeing the full range of wheel speeds so how would it know what’s normal at motorway speeds? Probably exacerbated by mismatched or new tyres, as reported by some.

[degzi]

Most of the reports of false alarms seem to involve motorways, which makes me wonder whether the calibration process is being carried out diligently. The handbook advises you should get up to high speed during the calibration period. If you don’t, and just pootle around at 30-40mph, then the system isn’t seeing the full range of wheel speeds so how would it know what’s normal at motorway speeds? Probably exacerbated by mismatched or new tyres, as reported by some.

Also tyres gain a few psi when they get hot on motorway speeds, so any small difference is exaggerated.
I'm guessing different brands have different rubber properties too which again accounts for different branded tyres heating up at different speeds and giving false alarms.

[fatlad]

page 450 of owners handbook

[BadgerMk3]

Could you please elaborate how the sticking brake caliper affects to the wheel speed sensors.

In answer to your question TnTkr...

The tyre deflation system relies on signals from the ABS sensor which inputs to a mathematic algorithm in the ECU. It's not a true pressure reading, but relies on 'pulses' from the ABS sensor on each wheel to simulate rolling circumference of each wheel.

A sticking brake caliper will generate heat into the wheel, which will in turn generate heat into the tyre, thereby increasing its rolling circumference and affecting the amount of 'pulses' the ABS sensor generates per wheel rotation.

Also an an aside, most modern (ish cars) use some sort of stability programme - ESC in Honda terms? - and these tend to use the rear brakes to offer stability in adverse situations generally without the driver knowing. That's why a lot of owners don't appreciate why their rear brakes tend to wear out quicker then the fronts which actually take the most load in normal situations.

I appreciate this forms demographic may not really appreciate or indeed care what I've written, but I've thrown it out there anyway.

Hope this helps.

[TnTkr]

Thank you for your answer BadgerMk3! You seem to know how the system works. That's also exactly what I tried to say in reply #11.

[Lord Voltermore]

Also an an aside, most modern (ish cars) use some sort of stability programme - ESC in Honda terms? - and these tend to use the rear brakes to offer stability in adverse situations generally without the driver knowing. That's why a lot of owners don't appreciate why their rear brakes tend to wear out quicker then the fronts which actually take the most load in normal situations.

You learn something every day .I knew stability control  existed but  never really equated it to increased rear pad wear.  Thanks  .The car must have other clever tricks  that confound the uninitiated.

[fatlad]

how do i calibrate the tpms?
ive followed the instructions below & all it said was completed straight away without even driving.
i know ive got to drive for 30 mins between 30 - 70 mph but what dash setting do i need for this?

[Marco1979]

how do i calibrate the tpms?
ive followed the instructions below & all it said was completed straight away without even driving.
i know ive got to drive for 30 mins between 30 - 70 mph but what dash setting do i need for this?

Indeed, it says ‘completed’ straight away. But the manual also states that it will complete automatically. The initiation of the recalibration is completed, not the recalibration itself. It will start to do that without any further actions. So you do not need to do anything except driving like you normally would .

[TnTkr]

It is instructed a bit strange way. It misses to tell that after the display returns to show "completed", then you need to start driving as instructed. And as the manual say, the system finished the process automatically.