Aygo X - Cancel Tyre warning

[mark brunt]

We have a six-month-old Aygo X. The tyre warning is on and  the manual does not tell how to cancel it.

Obviously I checked the pressures - 37 and 35 as in the book and on the door shut. I rang my dealer, (SLM Uckfield) and was told to use 33psi all round and did not know how to cancel the warning. He promised that someone would call me back (all busy with customers!). there was no call back.

Two questions:

1) is this the after-sales service to expect from a Toyota dealer ?

2) How do I cancel the warning?

[Cyker]

I believe there should be a button to reset to the current setup, but you'd have to have a good read through the manual as I don't know where it'd be in the aygox...

Hmm, does the aygox have active or passive TPMS?

 

[Wiz201]

I found this bit in the manual which may help you

Turn the engine switch to ON.
4 Press arrows up/down of the meter control
switch to select .
5 Press arrows up/down to select “Vehicle
Settings” and then press and
hold .
6 Press arrows up/down to select “TPWS
setting” and then press .
7 Press arrows up/down to select “Setting
Pressure”. Then press and hold OK until the tire pressure warning
light blinks 3 times.

[Wiz201]

Its page 270 of the manual for future reference - the word initialization is basically the way to reset the warning.

[Wiz201]

5 minutes ago, Cyker said:

I believe there should be a button to reset to the current setup, but you'd have to have a good read through the manual as I don't know where it'd be in the aygox...

Hmm, does the aygox have active or passive TPMS?

 

Not sure, it only activates when the pressure changes, so would that be passive?

[FROSTYBALLS]

The Aygo used an indirect system (ie. using the abs sensors to measure differences in the wheels rotation).

The Aygo X uses a direct system (tyre pressure sensors in each wheel).

See: https://mag.toyota.co.uk/how-does-tpms-work/

 

[FROSTYBALLS]

54 minutes ago, mark brunt said:

I rang my dealer, (SLM Uckfield) and was told to use 33psi all round and did not know how to cancel the warning. He promised that someone would call me back (all busy with customers!). there was no call back

1) is this the after-sales service to expect from a Toyota dealer ?

Who did you speak to at the dealer - sales or service? Service would have been the most appropriate.

Not just Toyota dealers who do this. We had a similar experience with a Honda dealer's service department.

[Cyker]

Passive works by detecting the wheel shrinking and spinning at a different speed when the tyre deflates.

Active uses (expensive!) sensors in the wheel inflatey stem thingies which directly measure tyre pressure.

If there's a dash mode that shows tyre pressures, that's a dead giveaway it's active - My Mk4 has that, which saves me having to manually check them  

[Rhymes with Paris]

Probably not on a new Aygo, but when I asked on here for my friend's 2015 Aygo, I was advised that there is a simple reset button in the glovebox.

It worked a treat.

Things have most likely been "improved"since then.

[Wiz201]

1 hour ago, Rhymes with Paris said:

Probably not on a new Aygo, but when I asked on here for my friend's 2015 Aygo, I was advised that there is a simple reset button in the glovebox.

It worked a treat.

Things have most likely been "improved"since then.

yeah its not so simple anymore

[dannyboy413]

46 minutes ago, Wiz201 said:

yeah its not so simple anymore

That is what you call an 'improvement'. 

[Derek.w]

38 minutes ago, dannyboy413 said:

That is what you call an 'improvement'. 

Yes for MFG not necessary a improvment for the end user.

[haelewyn]

15 hours ago, Cyker said:

I believe there should be a button to reset to the current setup, but you'd have to have a good read through the manual as I don't know where it'd be in the aygox...

Hmm, does the aygox have active or passive TPMS?

 

From memory and just checked it in my manual : passive.
My little book describes a passive system.

Copied from the one in English :  

''''''Your vehicle is equipped with a tire pressure warning system.
While the vehicle is in drive, the system monitors the fluctuations in
the wheel speed signals that are output by the speed sensor for the
brake control system. It informs the driver if it detects a
low tire inflation pressure. A warning with the tire pressure
warning light and warning buzzer when there is a known level of low
tire pressure.'''''''''''''''

I read that @Frostyballs writes it's an active system though. 
Will check the wheels today about that. Manual could be wrong also of course, or written too 'general'.

As far as I know some advantages / disadvantages are :

Active system : the sensors get a low Battery (small one) after about 6 - 9 years (?) and are expensive to replace.
Passive system : no individual sensor for each wheel. Less precise (can't see exact pressure for each wheel on the display), no need for replacement of the sensor. WIll work as good as for ever as long as Toyota didn't save too much money on the systems they bought.

[Cyker]

TBH the passive system kinda sucks as you'd probably know the tyre's deflated from the dreaded thwupthwupthwup sound before the system alerts you. It's just not very accurate because it is basically 'guessing' based on differences in the wheel speed sensor readings, which is never going to be give great results since the wheels all turn at slightly different speeds normally, except when you're travelling in a dead straight line.

The active system is functionally better but expensive - I was going to get a 2nd set so I could leave the originals in the 17" rims, but they were something like £75 *each*, which was nearly double the cost of the 15" rims!  

IMHO they really should have put some sort of kinetic charging system into them, or at least made the batteries replaceable instead of soldering them in and covering them in potting compound - They always talk about how they're trying to reduce waste and then they go and make the sensors a 1-use disposable item.

Another way you might be able to tell is passive systems tend to have normal rubber stems for the air, but on active systems they're usually solid and metal. Newer ones supposedly have a replaceable rubber stem 'tho so not an infallible tell.

 

[Wiz201]

The passive system just basically detects a discrepancy in the pressure - its always gone off for me when I've simply put more air in my tyres after 6 months of usage.

[haelewyn]

Rubber valves in mine.

Could contain a small Battery, judging from the shape.

Can't see a detailed pressure for each tyre anywhere. That would be a confirmation of active system.

I have the 18 inch wheels..

[Cyker]

The Battery is about the size of a 10p - The only way to know for sure is when they tyre's off - The active sensors will have a bit that looks something like this in it:

 

[mark brunt]

Thanks - particularly to Wiz201.

I'll try this out and check my manual @ page 270.

[mark brunt]

No cigar this time! - but thanks anyway

Our manual has only 250 pages...

I'll try the procedure listed later by Wiz 201

[AisinW]

I wished I know how to short and disable these expensive TPMS. The ABS indirect system is probably the best price per performance but most Toyota use direct sensors. 

I know that some older camry and prius owners short the pins on the TPMS receiver wiring and eliminate these TPMS warning completely. But owner must check the pressures regularly. Probably every 6 months. 

[Cyker]

Why would you want to do that?? I'm not keen on the replacement cost of the sensors, but that's a problem for many years in the future!

In the meantime, they work much better than the passive system and you've already paid for it so why try and bypass it? If there is a warning, surely it would be best to fix the problem rather than just bypassing the warning?

I do like that they finally tied them into the system so you can see what the pressure on each wheel is in real time on newer cars. It's fascinating watching the pressures increase was when you're hauling up the motorway!

 

[AisinW]

@Cyker we did this short pins all the time in the past 10y in  older Toyota and Lexus. It has minor purpose for such an expensive systems. Those sensors costs much more than a set of new tires. 

For most people in many states of the USA, Those are all considered to be BS. A dirt cheap $1 pressure tester is more than enough for $7k or less value car owners. We  need to check the tires pressure regularly anyway. 

It is just dumb to make it necessary to pass MOT. it has no critical functionality and replacable by $1 tire pressure checker. 

I found the location of the TPMS receiver module for my Auris.  I will short the pins once my TPMS starts dying. When all work fine, that's good but I won't waste money on replacing those. Shorting the TPMS receiver will not cause check engine lights. Older cars are allowed on the roads even they never have any TPMS from day one.

[Cyker]

Oh I see, yeah that is a bit of an annoyance for the MOT test, but for older cars you should be able to use third-party sensors which would be a lot cheaper. Also, they generally last 8-10 years so in the grand scheme of things not that high a cost. They'd last through around 3-5 sets of tyres I'd imagine!

[mark brunt]

Done it!

I had assumed that the printed manual that came with the car, would be the same as the online version No! The online version includes the instructions, as kindly copied by Wiz201.

 

I am a retired specialist in Ergonomics and spent much of my career designing human-computer interfaces. I must say that while generally these designs are getting slowly worse, the Aygo X interface is the most difficult yet - and that is saying a lot.

We love the car, but the access to minor controls is unbelievable!

[Cyker]

That's the downside of all the extra functionality - They can't fit buttons for everything or it'd look like the cockpit of a jumbo jet, so they stick everything in software menus but nobody can design an intuitive useable interface any more (I'm looking at you Windows 11!!) so you either have to read the manual a lot or play Hunt The Setting.

It is a background worry as cars get increasingly computery, as even software companies can't write software properly any more (Again, I'm looking at you Microsoft!), nevermind car companies, and I've noticed a rapid increase in software-related car problems over the past few years, especially with EVs!