I took my car to an alloy wheel specialist to have a ding fixed. I used ACC all the way there. He took the wheel off and replaced it with the spare, a full size unit rated for 50mph,

When I left the car park I heard a ping alarm and the message "ACC not available" popped up on the infodot screen. I stopped the car and turned off the engine/ignition. I then restarted and the ACC was showing as on. Then after driving a few hundred yard up the road there was another ping and the same "ACC not available" message. Then I got "rear offside tyre pressure low".

I think the car is too clever by half. It knows that the original wheel is not on, with its associated pressure sensor and has disabled the ACC for safety reasons. I get the wheel back tomorrow so will post an update if ACC works again.

 

BTW I told them it has a pressure sensor inside and they acknowledged it. Whether that makes a difference or they destroy it in the curing process who can tell.

I crawled home last summer on the spare after getting a puncture and the same thing happened. It was fine after I put on the new wheel. I set the TPMS before I took off.

TerryMcK,

But there is no Pressure Sensor inside is there if you have the OEM system,  odd the person you told agreed, obviously they do not know,

the TPMS is working on the ABS / ESP sensors is it not?.

 

When you fitted the spare did you reset the TPMS. 

You can with a slightly different sized tyre on and get no warning.

 

As it is do not use Cruise Control or the likes with an odd one out, Tyre / Pressure / Compound / Wheel size / weight.

Edited 24 January, 20188 yr by AwaoffSki

No I didn't set the TPMS on the spare. I just went without ACC until I got the new wheel fitted the next day. Figured it wouldn't be safe to use it.

5 minutes ago, AwaoffSki said:

TPMS is working on the ABS / ESP sensors

Ahh well that is good to know. At least they won't roast the sensor in their ovens.

Glad to know somebody else has experienced the same and it goes away when the original is fitted @Auswede . I will set the TPMS on the fixed wheel when I collect it tomorrow though.

Good.

You should check your tyre pressures regularly anyway, season changes as well as just regular checks, and reset the TPMS.

Tyres can deflate and there be no alert from the TPMS as they are deflating evenly.

You can have odd one out tyre pressures and the TPMS set and no warnings.

(the cheapo type of system used is one originally devised to warn those with Run Flats that there was a puncture, not surprisingly some of those BMW / MINI type  drivers never noticed....)

diameter of spare wheel is 5.3% less than regular tire,
that is the reason ACC is turning off automatically -
really annoying were driving ~80 km back to home at night without CC

 

strongly recommending install Direct TPMS, it costs just €50

https://www.briskoda.net/forums/topic/434028-tire-pressure-monitoring-system/?tab=comments#comment-4893182

1 hour ago, AwaoffSki said:

But there is no Pressure Sensor inside is there if you have the OEM system,  odd the person you told agreed, obviously they do not know,

the TPMS is working on the ABS / ESP sensors is it not?.

 

That is exactly the system we had on the Seat Leon and the system I was originally expecting to get on the Superb from the literature I had read. But I subsequently found out that in line with EU legislation current TPMS systems use valves.

 

When the Superb arrived I was delighted to see rubber valves instead of the metal TPMS valves used on the Mrs Nissan. Yipee, off with a skip and a jump. But having checked this with the service dept It was confirmed I have TPMS valves in the wheels. Turns out that not all are metal, some use a rubber stem and that is what we have on the Suberb. Not sure when Skoda started fitting them, heard several dates.

Good if you get that system with individual tyre pressures and temperatures displayed.

 

EU Regulations / Type Approval does not require Valves sensors for a TPMS

 unless regulations changed since the latest Type Approved cars on sale were type approved, eg Karoq / SEAT Arona. 

Tyre Pressure Monitoring System Legislation _ EU & US TPMS.mhtml

latest-information-notice.pdf

Edited 24 January, 20188 yr by AwaoffSki

Had the ABS system on 4 cars in the past and it always worked as exactly as intended warning me of 2 punctures in 12 years. You had no idea which corner it was, a gauge told you that.

 

Wifes Nissan has the valve based system but it does not display individual pressures, simply alerts you to a low pressure just like the ABS system but whereas the ABS system worked on a 30% pressure drop the valve woks on 3 psi. You still need a gauge to confirm where the puncture is, how do I know that?

 

Would be very surprised if the Karoq has ABS system since the current legislation requires the system to identify the corner where the soft tyre is and ABS does not do that.

When I had to put the skinny spare on, I reset the TPMS and drove about 5 miles and got a "TPMS unavailable/faulty" type message (can't remember the exact wording) and ACC not available.  Resetting the TPMS didn't fix it. I put the repaired wheel back on and reset the TPMS but it still wouldn't clear the fault nor bring back the ACC. I drove home 85 miles and still the TPMS fail and no ACC. Fortunately I have VCDS and was able to clear the fault with that, otherwise it would have been a dealer visit.

 

There was a noticeable difference in diameter between the skinny spare and my 19" wheels which clearly upset the TPMS and ACC (well the ABS module in fact) due to the wheels going round at different speeds.

Was a proper tyre pressure monitor available on the Superb III? I don't think it was so relies on ABS sensors. I'd have ordered a proper TPMS setup if available like I had on the Passat CC.

 

I'd not want to run around on a space saver too long - but better than a can of gunk.

24 minutes ago, rtj70 said:

Was a proper tyre pressure monitor available on the Superb III? I don't think it was so relies on ABS sensors. I'd have ordered a proper TPMS setup if available like I had on the Passat CC.

 

I'd not want to run around on a space saver too long - but better than a can of gunk.

Not available as far as I know.

@skidpan @rtj70

You are surprising me
is it that difficult click on link, which i have posted in previous post of this tread?

3 hours ago, MartiniB said:

@skidpan @rtj70

You are surprising me
is it that difficult click on link, which i have posted in previous post of this tread?

 

I was meaning not available as a factory fit option. On other VW group cars you can see the tyre pressures in the infotainment and 'maxi dot'.

3 hours ago, MartiniB said:

@skidpan @rtj70

You are surprising me
is it that difficult click on link, which i have posted in previous post of this tread?

Yes you can get aftermarket TPMS but you would still have the factory fit ABS TPMS and the ACC would still fail when you put the skinny on.

@nicknorman

in theory higher tire on spare wheel can help us

On 1/3/2018 at 14:28, MartiniB said:

another downside of -5.3% diameter of stock 205/55r16 spare wheel is impossibility use the Cruise Control

 

have no idea can we insert 205/65r16,

which will be just 0.8% bigger than 215/55r17

and 0.7% smaller than 225/55r17

 

 

 

When I had tyre pressure sensors on the Passat, the full size spare obviously had the same sensor. On the other hand the more advanced sensors used for the pressures on a Phaeton would monitor the pressure of the spare wheel too.

Even if it was the same size the sensor could be picking up on different torque as the weight would be different.

have read on russian Drive2.com they have to activate Indirect TPMS by VCDS,
looks like we have chance disable it same way to able use ACC with spare wheel too

there is a great probability iTMPS is deactivated for user interface, but still in use by car's computer.

My Superb had a complete meltdown when I changed to winter tyres, usually jack up one side at a time to replace wheels but this year did one corner at a time. Anyway, reset TPMS, drove of driveway - tyre pressure loss warnings, ACC / front assist / autohold unavailable etc. Continued for 1/2 mile all errors cleared. I assume jacking the car at funny angles somehow screwed up the ABS sensors

^^^ Not really, just needed a distance travelled to recognise and gets the brain farts shorted out.

The In tyre / In valves sensors are a whole different kettle of fish from the ABS / ESP system remembering the circumference of the tyres as previously set, 

and the variation on the speed of one tyre / wheel turning over the other on that axle when going straight.

Or any difference on one or more from the setting stored.

3 hours ago, MartiniB said:

have read on russian Drive2.com they have to activate Indirect TPMS by VCDS,
looks like we have chance disable it same way to able use ACC with spare wheel too

there is a great probability iTMPS is deactivated for user interface, but still in use by car's computer.

Yes I expect the ABS TPMS can be switched off by VCDS if you know what you are doing, however what is behind both the TPMS and the ACC, is the ABS module and if the ABS module has implausible wheel speed signals it may well disable the ACC even if the TPMS is switched off. My problem with the ACC was not a TPMS puncture warning, but a hard failure due to the implausible wheel speed signal. The skinny tyre diameter was about 25cm less than the normal tyre, which is a lot!

Just had my wheel ding repaired by SmartWheels in Manchester. A great company and the wheel looks like a brand new one.

 

Through chatting with the very knowledgeable owner of SmartWheels the metal bodied stems on TPMS sensors have a tendency to corrode in the wheel and they have to saw them off to get them out in some cases. This destroys them unfortunately. They cost him around £25 and he has all the necessary coding equipment for them to suit different manufacturers.

For information the TPMS sensors on Superb III wheels are inside each wheel and have nothing to do with the ABS system. On my 19" L&K they have the rubber stem which the wheel people much prefer when dismantling the wheel.

 

Anyway I set the tyre pressure so it was the same as the others as per the notice on the inside of the fuel filler cap and reset the TPMS system in the car.

ACC was previously unavailable when using the spare due to the different rotational speed of the spare wheel probably because the circumference is different to the others. This is measured by the ABS system. When I took it for a drive with a full set of 19" wheels ACC was restored.

Edited 26 January, 20188 yr by TerryMcK

38 minutes ago, TerryMcK said:

Just had my wheel ding repaired by SmartWheels in Manchester. A great company and the wheel looks like a brand new one.

 

Through chatting with the very knowledgeable owner of SmartWheels the metal bodied stems on TPMS sensors have a tendency to corrode in the wheel and they have to saw them off to get them out in some cases. This destroys them unfortunately. They cost him around £25 and he has all the necessary coding equipment for them to suit different manufacturers.

For information the TPMS sensors on Superb III wheels are inside each wheel and have nothing to do with the ABS system. On my 19" L&K they have the rubber stem which the wheel people much prefer when dismantling the wheel.

 

Anyway I set the tyre pressure so it was the same as the others as per the notice on the inside of the fuel filler cap and reset the TPMS system in the car.

ACC was previously unavailable when using the spare due to the different rotational speed of the spare wheel probably because the circumference is different to the others. This is measured by the ABS system. When I took it for a drive with a full set of 19" wheels ACC was restored.

On my 2016 reg Superb III  L& K with 19” wheels, the TPMS definitely comes from the ABS. The hard fault in the ABS which I cleared with VCDS presented itself as a TPMS failure on the maxidot. Maybe later Superbs have “proper” remote pressure sensing, I don’t know.