Tyre pressure monitors (1 Viewer)

[Stand Off]

Does anyone have the factory fitted tyre pressure monitors from hymer?

I asked for and have been charged for them but can't find any reference to them in the paperwork. I cant go and look just yet as my van is on a storage compound.

So if anyone can help with what i'm actually looking for and how they work, i would appreciate it.

 

[peterc10]

Yes we have them. Not sure how they work as nothing obviously different on the wheel. When you first switch on the ignition one of the many warning lights that come on and then go out will be one with a cross section of a tyre.

They do work. When i lowered the tyre pressures a earning comes up. Bit it seems it does go away if you drive it for a few miles at the nee pressure.

 

[Stand Off]

Yes we have them. Not sure how they work as nothing obviously different on the wheel. When you first switch on the ignition one of the many warning lights that come on and then go out will be one with a cross section of a tyre.

They do work. When i lowered the tyre pressures a earning comes up. Bit it seems it does go away if you drive it for a few miles at the nee pressure.

Thank you very much for that. As you say, there are no obvious signs that they are fitted. I will keep my eyes open for the warning light.

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[Spriddler]

You won't see anything.
An indirect Tyre Pressure Monitoring System typically relies on the wheel speed sensors that the anti-lock brake system uses. These sensors measure the rate of revolution of each wheel and is used by on-board computer systems to compare with each other and to other vehicle operation data such as speed. Based on the rate of revolution of each wheel, the computer can interpret the relative size of the tires on your vehicle. When a wheel starts spinning faster than expected, the computer calculates that the tire is underinflated and alert the driver accordingly.
A less common (often a retrofit) method is with a sensor and transmitter inside each tyre and attached to the wheel.
HTH

 

[peterc10]

You won't see anything.
An indirect Tyre Pressure Monitoring System typically relies on the wheel speed sensors that the anti-lock brake system uses. These sensors measure the rate of revolution of each wheel and is used by on-board computer systems to compare with each other and to other vehicle operation data such as speed. Based on the rate of revolution of each wheel, the computer can interpret the relative size of the tires on your vehicle. When a wheel starts spinning faster than expected, the computer calculates that the tire is underinflated and alert the driver accordingly.
A less common (often a retrofit) method is with a sensor and transmitter inside each tyre and attached to the wheel.
HTH

The Fiat ones can't be based on that system. As soon as I let air out of the tyre it sends up a warning when I switch the ignition back on, even though the wheels have not moved at all.

 

[Robert Clark]

Yes we have them. Not sure how they work as nothing obviously different on the wheel. When you first switch on the ignition one of the many warning lights that come on and then go out will be one with a cross section of a tyre.

They do work. When i lowered the tyre pressures a earning comes up. Bit it seems it does go away if you drive it for a few miles at the nee pressure.

Hi Peter
Are these set to a default pressure or can they be adjusted to your chosen setting?

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[Spriddler]

The Fiat ones can't be based on that system. As soon as I let air out of the tyre it sends up a warning when I switch the ignition back on, even though the wheels have not moved at all.

Well then it probably has the Direct Tyre Pressure Monitoring System (DTPMS) inside each of the tyres that I mentioned in the last line of my original reply, viz: 'A less common (often a retrofit) method is with a sensor and transmitter inside each tyre and attached to the wheel.'
Sensors in a DTPMS may even provide tyre temperature readings. The direct tyre pressure monitoring system sends all of this data to a centralised control module and if tyre pressure is lower than it should be, transmitted directly to a dashboard indicator light. With some systems each sensor has an i.d. number so that the system can register the pressure of each individual tyre.
HTH

 

[peterc10]

Hi Peter
Are these set to a default pressure or can they be adjusted to your chosen setting?

Long story short Robert

I could find no way of adjusting settings on them and nor can a Fiat Pro dealer.

However Becks had to change a wheel last Monday and after they did the pressure warning sensor came on. They told me to just drive for a while and it would reset itself and sure enough it did. So I think it auto resets itself when you change pressure. Would have been better if the Fiat Pro dealer knew that but I suspect they are not often specced on vans.

 

[Robert Clark]

Long story short Robert

I could find no way of adjusting settings on them and nor can a Fiat Pro dealer.

However Becks had to change a wheel last Monday and after they did the pressure warning sensor came on. They told me to just drive for a while and it would reset itself and sure enough it did. So I think it auto resets itself when you change pressure. Would have been better if the Fiat Pro dealer knew that but I suspect they are not often specced on vans.

Is that a standard feature on new Ducato's Peter ?

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[peterc10]

Not as far as I am aware. For my 2015 Hymer it was a factory fit extra that was specced by the dealer.

 

[Jimbo50]

Not absolutely sure, but wasn't there an EU directive that all vehicles after 2011 needed them fitting by the manufacturer?

 

[joka250]

You won't see anything.
An indirect Tyre Pressure Monitoring System typically relies on the wheel speed sensors that the anti-lock brake system uses. These sensors measure the rate of revolution of each wheel and is used by on-board computer systems to compare with each other and to other vehicle operation data such as speed. Based on the rate of revolution of each wheel, the computer can interpret the relative size of the tires on your vehicle. When a wheel starts spinning faster than expected, the computer calculates that the tire is underinflated and alert the driver accordingly.
A less common (often a retrofit) method is with a sensor and transmitter inside each tyre and attached to the wheel.
HTH

This might be true of some vehicles but a Volvo, Toyota and Honda all post 2015 with legally required TPMS fitted or are internal to the tyre/wheel assembly and certainly do not have anything like this.

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[funflair]

This might be true of some vehicles but a Volvo, Toyota and Honda all post 2015 with legally required TPMS fitted or are internal to the tyre/wheel assembly and certainly do not have anything like this.

We have had 3 BMW's in the last 4 years (long story) all in theory the exact same spec the first two had the TPMS via the ABS sensors as described, the last one had the in wheel pressure sensors.

On the BMW's you can tell which you have by the tyre valve, rigid on the in wheel and rubber on the ABS sensor type.

Martin

 

[joka250]

We have had 3 BMW's in the last 4 years (long story) all in theory the exact same spec the first two had the TPMS via the ABS sensors as described, the last one had the in wheel pressure sensors.

On the BMW's you can tell which you have by the tyre valve, rigid on the in wheel and rubber on the ABS sensor type.

Martin

Have checked some of my data sheets which suggest BMW and other manufacturers had problems with the ABS linked system and have or are moving to internal systems. funflair absolutely correct in his method of spotting which is which.

 

[pappajohn]

The 'in wheel transmitter' type have receivers in the wheel arch for at least 3 wheels, the fourth wheel pressure by deduction of the other three....black magic.
They are not usually fixed pressure dependant but rely on a pressure differential between wheels
As long as all pressures are within the same parameters, regardless of actual pressure, they will not show a fault.
They generally require the wheel to be turning to transmit a signal or extinguish a warning after inflation.

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[pappajohn]

I could find no way of adjusting settings on them and nor can a Fiat Pro dealer.

Put the same pressure in EACH wheel.....any pressure.....and the system sorts itself out.
As in my last post, they rely on a pressure differential between wheels, maybe 4 or 5 psi difference, and not a pre-determined and fixed min/max pressure.

 

[peterc10]

Put the same pressure in EACH wheel.....any pressure.....and the system sorts itself out.
As in my last post, they rely on a pressure differential between wheels, maybe 4 or 5 psi difference, and not a pre-determined and fixed min/max pressure.

Not sure that is how the Fiat ones work. I did put the same pressure in bith sides but it still showef a fault.

 

[CWH]

Not absolutely sure, but wasn't there an EU directive that all vehicles after 2011 needed them fitting by the manufacturer?

I thought that was just cars, not all vehicles, so I googled and found this:

EU Tyre Pressure Monitoring System Legislation
On Tuesday 10th March 2009 The European Parliament in Strasbourg officially approved a Directive Proposal of the Commission aimed to simplify and change the type approval of motor vehicles in Europe.

At the same time this proposal introduces a series of implementing measures imposing mandatory adoption of some proven existing technology including Tyre Pressure monitoring Systems (and ESP).

As for TPMS introduction dates and technical specification this mandate officially requires that (see article 9.2 of adopted text):

"Vehicles in categories M1 shall be equipped with an accurate Tyre Pressure Monitoring System capable of giving, when necessary, an in-car warning to the driver when a loss of pressure occurs in any tyre, which is in the interests of optimum fuel consumption and road safety. Appropriate limits in the technical specifications shall be set to achieve this, which shall furthermore allow for a technology-neutral and cost-effective approach in the development of accurate Tyre Pressure Monitoring Systems."

As for the introduction dates of TPMS, there is a two year phase-in schedule starting from November 1st 2012. Article 13.1 to 13.4 of the adopted text states that all vehicles type approved after this date must install a TPM System. Furthermore all newly registered vehicles after November 1st 2014 must have a TPM System.

https://www.bartecautoid.com/tpms-legislation.html​

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[funflair]

And a motorhome is "M1 Special Purpose" so does this fall inside out outside the above EU legislation for category "M1".

Martin

 

[peterc10]

As I have siad my 2015 Hymer had TMPS. But that is only because the dealer specced it as an extra. It was not a standard fit. So implementation dates must have shifted as they usually do with the EU.

 

[CWH]

From

• Do I need TPMS on any other vehicles? As per the new EU regulation, only new passenger vehicles registered after November 1st 2014 will need to have TPMS fitted.

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