Tyre pressures

So to resurect this topic again :)

Had new tyres fitted at the rear (BfGoodrich) and adjusted the pressure to the recommended by BfGoodrich but now my TPMS is going crazy every time I start the van. Unlucky for me I have a Citroen Relay based van and the TPMS has no user reset function or learning algorithym. I have contacted my local Citreon van centre who are looking into the issue. The person I spoke to thinks that the tyre pressures are set in the ECU.
I have also sent a long email to Wildax, the converters who should have solved this at stage 2. So I have a sticker on the door post which reads 5.5 bar front and rear and the TPMS telling me the pressure is to low and an MOT due this year.
Does anyone have any thoughts on where we stand legaly and on insurance if the vehicle has stated pressure but running under that. I can't help thinking that running over pressure is just as dangerous.
Sorry for the wall of text.
Jenrai
 
I believe if a TPMS system is fitted, it must not show an fault otherwise it is an MOT Failure. I may be wrong on that, but that is my undertstanding.

Now going off at a slight tangent, on Toyota RAV4s there was a model with standard TPMS and when owners fitted winter tyres, the system would come up with an error as the sensors (in the wheels) were missing. The fix for that was to snip a specific wire which disabled the TPMS system.
I wonder if there is a similar kind of workaround on the Relays? A specialist Relay/Sevel Van Forum might have some threads about the TPMS system?

Now to your actual problem, here is a thought ....
The original TPMS systems in vehicles generally operated by using sensors fitted to each wheel. Many Manufacturers use a different system now which is cheaper for them to implement and uses the ABS data from each wheel and essentially compares the revolutions of each wheel to the other. When a tyre is low pressure, it has a reduced rolling circumference and that smaller circumference is compared to the other good tyres, a mismatch is detected and a TPMS warning flagged up.
In your case, you have big chunky tyres on the rear which will, even if they are the same size and profile as the fronts, have a greater rolling circumference and this difference between front and rear could - if the "ABS" style of TPMS is used - cause an error to be erroneously flagged.
If the TPMS is based purely on wheel differentials, matching front and rear would resolve.
However , if it is based on expected amount of rotations of a wheel for a given speed (which is possible), a chunky tyre, even fitted on all 4 wheels, may always report TPMS errors.
 
Your tpms can be adjusted by a main dealer , but they are reluctant to do it , your old tyres are probably high pressure motorhome , camping tyres ,that run on 5.0 tp5.5 bar . I would think you need to use BF pressure as 5.5 bar would be to high for their spec .download the BF tyre pressure data and keep in the van as evidence if you are ever road side checks . Check the weight capacity on BF tyres is up to the max weight of your van .as Wildebus says A tpms error is an mot failure .not a good idea to run mixed tyres or if resetting tpms could need doing again when front tyres are changed , understably some dealers refuse to reset tpms settings
 
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Jenrai said:
So to resurect this topic again :)

Had new tyres fitted at the rear (BfGoodrich) and adjusted the pressure to the recommended by BfGoodrich but now my TPMS is going crazy every time I start the van. Unlucky for me I have a Citroen Relay based van and the TPMS has no user reset function or learning algorithym. I have contacted my local Citreon van centre who are looking into the issue. The person I spoke to thinks that the tyre pressures are set in the ECU.
I have also sent a long email to Wildax, the converters who should have solved this at stage 2. So I have a sticker on the door post which reads 5.5 bar front and rear and the TPMS telling me the pressure is to low and an MOT due this year.
Does anyone have any thoughts on where we stand legaly and on insurance if the vehicle has stated pressure but running under that. I can't help thinking that running over pressure is just as dangerous.
Sorry for the wall of text.
Jenrai
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I’ve been running on bf Goodrich for a couple of years now and only put 55psi in front and 60 in rear I would think running them at 5.5 bar is way to high my van is a 2009 Citroen Relay and it handles really well on them .
 
Exwindsurfer said:
I’ve been running on bf Goodrich for a couple of years now and only put 55psi in front and 60 in rear I would think running them at 5.5 bar is way to high my van is a 2009 Citroen Relay and it handles really well on them .
Click to expand...
Have to agree 60 to 80 is a big difference , 5.5 is correct for camping tyres not for mixed bf and camping ? Is 55 n 60 the max recommended pressure for BF?
 
Thank you all for your replies, very helpful as always (y)

@wildebus I am not sure about the rotation thingy but when I start the van it shows what the pressures are.

The continental camper tyres I have never run at 5.5 bar/79 psi as that is way to high. Currently inflated to 4 bar and no warning at the front.

In terms of the bfgoodrich tryes, i consider them camper tyres in all but name. They have the same 10 ply sidewall, almost the same load and speed index. Only they be a bit chunky, like me :)

So the bfgoodrich recommended pressure: 50 psi/3.5 bar = 1758kg and 55 psi/3.8 bar = 1868kg
For me the sweet spot is around 4 bar.
 
i know you don't want to run at the higher pressure, but if you inflate the BFGs to 4 bar, does the warning go (if so, that is a possible workround for the day of the MOT if you are still waiting for a Citroen Garage to come back to you with a proper solution).
Have you tried/got a copy of the Lexia (think that is name) software that lets you talk to the vehicle via a computer? this might let you set the TPMS parameters yourself? I bought the Software to talk to my Citroen cars but can't recall exactly what it let me do.
 
wildebus said:
i know you don't want to run at the higher pressure, but if you inflate the BFGs to 4 bar, does the warning go (if so, that is a possible workround for the day of the MOT if you are still waiting for a Citroen Garage to come back to you with a proper solution).
Have you tried/got a copy of the Lexia (think that is name) software that lets you talk to the vehicle via a computer? this might let you set the TPMS parameters yourself? I bought the Software to talk to my Citroen cars but can't recall exactly what it let me do.
Click to expand...
Apparently the Citroen TPMS is the same as the Peugeot Boxer and some other forum was talking about an android app. Being the least technical person in history this is not something I want to mess with. I know I can inflate the tyres to get around the MOT its just the annoyance of having the warning light. Tomorrow I will add some more air to see what point the TPMS goes out to see what I am working with.

I can't help thinking this must be a massive problem across our community in general, especially for converters which use base vehicles. Unless the converters are working with the likes of Citroen/Fiat/Peugeot to get the correct pressures agreed during first stage then most people must be driving with over inflated tyres. I am surprised this topic does not come up more often given TPMS is now a legal requirement on new vehicles.
 
The vanco camper tyres have reinforced side walls to cope with stress, long-standing and high loads on motorhome tyre's , I would ring wildax and ask for correct TP. Their is mark on the continental tyre wall that says max TP is 60 or 65 psi ,that is for American Market , their has been posts on many Web sites about 5 , ,5.5 bar pressure issue, my autosleeper manufacturer and door plate both say 5 ,5.5 bar is correct pressure,
 
Molly 3 said:
The vanco camper tyres have reinforced side walls to cope with stress, long-standing and high loads on motorhome tyre's , I would ring wildax and ask for correct TP. Their is mark on the continental tyre wall that says max TP is 60 or 65 psi ,that is for American Market , their has been posts on many Web sites about 5 , ,5.5 bar pressure issue, my autosleeper manufacturer and door plate both say 5 ,5.5 bar is correct pressure,
Click to expand...

Completely get where you are coming from but just because the maximum pressure is 5.5 bar that does not mean that they should be run at that pressure when not fully loaded. That is why tyre manufacturers have charts giving load index at pressure.
The van is plated at 2100kg front axle which continental state for the exact tryes I have fitted should be 4 bar.
The rear plated axle 2400kg which for continental is 5.25 bar.

I await a response from Wildax :p
 
Jenrai said:
Completely get where you are coming from but just because the maximum pressure is 5.5 bar that does not mean that they should be run at that pressure when not fully loaded. That is why tyre manufacturers have charts giving load index at pressure.
The van is plated at 2100kg front axle which continental state for the exact tryes I have fitted should be 4 bar.
The rear plated axle 2400kg which for continental is 5.25 bar.

I await a response from Wildax :p
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No ware did i say it is maximum pressure the plate on my van is 5f ,5.5r bar , no max or minimum range , you are correct vanco do give a weight to pressure chart that contradicts the van plate . So who is right ,the debate is still going on and on ?. I go by the plate and manufacturers instruction .
 
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Molly 3 said:
No ware did i say it is maximum pressure the plate on my van is 5f ,5.5r bar , no max or minimum range , you are correct vanco do give a weight to pressure chart that contradicts the van plate . So who is right ,the debate is still going on and on ?. I go by the plate and manufacturers instruction .
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The door sticker on my 2014 Peugeot does say fully loaded (handily in French and Italian). If you were to go by either the vehicle manufacturers or the tyre manufacturers recommendations you will have been seen to have taken reasonable care so either should be ok. It's when you make it up as you go along you may have a problem. 1624956435048.png
 
I understand it was also a case of when the vehicle was first approved. You could have a vehicle registered today that doesn't have TPMS as it was introduced prior to the mandatory introduction of TPMS on that model. (would apply to any Sevel X250 for example)
 
The Law. Since November 2014, all new passenger vehicles sold in the EU must be equipped with a tyre pressure monitoring system (TPMS). ... In the UK on 1 January 2015, legislation came into force stating that for these vehicles, an inoperative or faulty TPMS sensor would result in an MOT failure.
However tyre pressures are NOT checked during an MOT.
 
Interesting. I have read a lot about people pumping up their tyres so that the warning light goes out for the MoT thinking that if it is on then it is a fail but, taken from the MoT testers manual:

Tyre pressure monitoring system (TPMS)​

The inspection of the tyre pressure monitoring system (TPMS) is for M1 vehicles first used on or after 1 January 2012.

The TPMS warning lamp (see diagram 3) can operate in many ways depending on the vehicle type. You must only reject vehicles if it’s clear that the lamp indicates a system malfunction and not simply indicating that one or more of the tyre pressures is low.

Diagram 3. Example of a TPMS warning lamp

Diagram_3_Example_of_a_TPMS_warning_lamp.png


My van is too old to have this as a problem.
 
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