Peugeot Boxer TPMS Query

The Boxer's TPMS has tyre pressure sensors beneath each of its 4 alloy wheels' valves i.e. inside the tyre on the rim.  It does not work through the ABS and is not designed to be set by the driver.  Peugeot dealers are able to adjust the TPMS trigger points and for a charge may do so.  In my case I had to provide a note from Continental (who manufactured my 215/70 R15 109 CP tyres) endorsing the front and rear pressures I wanted to use for my actual axle masses when the van is fully loaded measured on a weighbridge  I used the TyreSafe model which is to use ETRTO pressures for an axle mass that is 10% higher.  The ETRTO pressures for both front and rear CP tyres can be seen in Continental's on-line Data Book.  The on-line TyreSafe calculator will also give you the front ETRTO CP pressures for a front axle mass that is 10% higher but unfortunately it will only give 5.5 bar/ 80 psi for the rear CP tyres.  For my fully loaded low profile Nuevo I currently set the cold tyre pressures at 3.3 bar front and 5.5 bar rear which is about 48 psi front and 80 psi rear.  This is for a fully loaded front axle mass of 1400 kg and rear axle mass of 1900 kg.  The Peugeot tyre pressure label states 5 bar / 72.3 psi front and 5.5 bar / 79.5 psi rear for when each axle is at is maximum permitted mass i.e. 1850 kg front and 2000 kg rear.  This is fine for my rear tyres but is way too high for my front tyres.  If you give me your fully loaded worst case axle masses and tyre size & type I can tell you what pressures I would use and therefore what your front and rear TPMS should be set to.

Front CP tyre pressures are the same or similar to C tyre pressures and therefore should not give an uncomfortable ride at the front where the travelling seats are.  CP motorhome tyres are stronger than C van tyres and at the rear are designed to run at higher pressures.  This is to improve motorhome stability and better withstand the continuous high rear load found on many motorhomes and careless drivers who overload one or both of their rear tyres.  If the rear CP tyres are run at less than their ETRTO recommended pressures for the axle load, the safety benefits of having CP tyres are much reduced.

If your Broadway EB hasn't been up-plated, the TPMS will have been set by Peugeot around cold tyre pressures of 5 bar front and 5.5 bar rear.  I found that if a lower cold tyre pressure is used it doesn't trigger the TPMS immediately and it may not trigger it at all if the pressure isn't low enough.  By experimenting it's possible to find out how much lower the cold tyre pressure can be before the TPMS eventually triggers noting that tyres warm up when they are driven on which increases their pressure.  

If you have the same tyres as me and your worst case rear axle mass is 1854 kg or above, there is definitely no need to change your rear TPMS setting of 5.5 bar/80 psi.  Even if you run your rear tyres at a slightly lower cold tyre pressure, perhaps because you have a lower rear axle mass, it won't trigger the rear TPMS.  As for your front axle, I can only guess that its worst case mass is going to be something like 1550 kg (if A-S's mass in running order of 1409 kg is correct).  This being so, 3.75 bar/54 psi would be about right.  All pressures are for an axle mass that is 10% higher.  From experience Continental will give you similar pressures but they will be lower as all they do is compare your axle masses to their Data Book and give you the next higher pressure increment from their table, which won't always be 10% higher, and they will assume you never exceed your axle mass and your axle load is always balanced equally between the two tyres which it wont be.

rgermain wrote:Any idea what year Peugeot started to fit TPMS?. My 2015 has not got it.

I think its to do with the way a van becomes a motorhome, registration, type approval et al which I don't fully understand but someone else on the Forum might.  So some vans like the Nuevo & Broadway and perhaps all the coachbuilts have to have a working factory fitted TPMS but other vans like PVCs don't.  TPMSs are not normally fitted to commercial vans and if they are its an optional extra.

rgermain wrote:Any idea what year Peugeot started to fit TPMS?. My 2015 has not got it.

N1 vehicles (up to 3500kg), had TPMS fitted for new Type Approvals after 1/11/2012, old type approvals came in 1/11/2014. So a van sold to AS before 1/11/2012 or 14 depending on when TA obtained are nor required to have TPMS. A old TA van after conversion but sold to final customer in 2015 might not have it. Some manufacturers fitted before the mandatory dates.

An ABS TPMS is infinitely better.  It’s cheaper to maintain and triggers when one tyre deflates more than the other on the axle which is all you need.  It wouldn’t be so bad though if converters - A-S - in our case, reviewed the trigger pressures points in conjunction with the tyre manufacturer and then asked Peugeot to change them as part of the Stage 2 or Stage 3 approval process.  The only UK converter I am aware of who does this is Bailey who set far more sensible front tyre pressures.

Arron wrote:

A tyre pressure gauge better still.

A good point.

A TPMS is no substitute for checking the cold tyre pressures before the vehicle is driven with a tyre gauge at least every month, before every long journey and if there has been a large change in air temperature since the last time it was checked.  I add that last point because earlier this year I set pressures at the start of a trip when it was about -7C but within a few days it was 10C and I had to let air out of the tyres and the rear tyres in particular that were over their maximum permitted cold tyre pressure.

A tyre pressure gauge and a pump are essential items to have in the van whether it has a TPMS or not.

breakaleg wrote:I was pleased when my 21 reg Fiat was supplied without tmps.

Don't know how I managed to drive for nie on 50 years without this system.

When you have a blow out during the rush hour on the m6 you don't need a light to come on, the state of your underpants will tell you all you need to know

Pete

That's interesting.  I got the impression that my Nuevo had it because it was a legal requirement but your's doesn't 

Maybe the vans are class N2. TMPS only became mandatory for that and other higher classes from Jan 2024