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TPMS!!


Barry Peake

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Just purchased an Elddis Acordo/Envy 120 2018 Euro 6 130 engine.All as expected but, the ride is too harsh,tyre pressures recommended (on door pillar) are 72 front and 80 psi rear, Continental tyres show 69psi on tyre.no information in the manual but various other reports state... unable to drop pressures without alarm sounding and lights on dash staying on.

Has anyone tried to drop the pressures and see if the computer will reset at the new lower pressures?

I'm reluctant to start a conversation with a Peugeot dealer if I can fix what should be a simple problem myself.

I have had the front and rear axles weighed both at 1300 kg so if I put another 200 kg on each axle so assume 1500kg which should be more than enough,the continental tyre charts recommended pressures are much lower than even the 69psi marked on the tyre.

Comments please.

 

 

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Hi Barry and welcome to the forum,

 

I would do as Colin suggested and use the max axle loads off your VIN plate to be on the safe side, unless this is massively higher than your estimated 1,500 kg per axle, then find your tyre size in this Conti on-line brochure

 

https://blobs.continental-tires.com/www8/servlet/blob/85806/e0854f2c7866c64da551474b998ef8b3/download-technical-databook-data.pdf

 

Start looking on page 80 for van tyres. You will need to look at 'Wheel position' 'S' for Single Wheel and across to your axle loading to read off the recommended tyre pressure in bar (1 bar = 14.5 psi).

 

You could then use this Conti info to approach Peugeot to get the limits reset if you cannot do it yourself.

 

Let us know what pressures you arrive at please.

 

Keith.

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The Peugeot-based motorhome/TPMS issue has been discussed on this forum in the past and I note that it’s come up again in an article on Page 176 of the current (July 2018) issue of MMM magazine.

 

If the TPMS system inflation criteria are set to the ‘normal’ 72psi(front) and 80psi(rear) pressures, the system will not reset itself if those pressures are lowered to gain a softer ride.

 

A Peugeot main agent can reprogram the TPMS system to match lowered inflation pressures, but some agents may well be reluctant to do this and there’s likely to be a charge.

 

Obviously, if the pressures are lowered significantly without the TPMS system being reprogrammed, alarms will be produced.

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For MMM magazine non-readers, the recent article includes the following statement”

 

“For other readers who have contacted MMM having TPMS (tyre pressure monitoring system) fitted as standard that couldn’t previously be reset to lower motorhome pressures, Peugeot offers a glimmer of hope. It stated recently

 

“The system is capable of having different values recorded in the ECU, but we can only configure the TPMS to the homologated pressures on the base vehicle.

 

If a customer wants the pressure set at a value that is different to those set by the factory, they will need to contact the stage two manufacturer (the motorhome converter), which can then liaise with the tyre manufacturer for advice.

 

Please note, if a motorhome converter decides it wants to run its motorhomes at a lower psi, its responsibility is to obtain the relevant safety testing and authorisation from the various tyre manufacturers.”

 

This April 2017 forum thread is probably the most relevant for Barry as it involves Elddis motorhomes

 

http://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Tyre-pressure-monitors-again/46926/

 

More TPMS-related forum threads can be found here

 

https://tinyurl.com/y83wrm8v

 

I’m guessing from the information provided by Barry that his Elddis Accordo has Continental VancoCamper tyres with a 215/70 R15CP 109R specification.

 

If that’s correct, then Continental’s minimum pressure-to-load data for axles with a 1500kg loading would be around 48psi (front axle) and 55psi (rear axle). Lowering the pressures from 72psi(F) and 80psi® to 48psi(F) and 55psi® is a BIG reduction and there’s every chance that doing this would provoke TPMS warnings.

 

It might be worth Barry trying a partial reduction to, say, 60psi(F) amd 70psi® to see if that makes his Accordo’s ride quality more tolerable but does not trigger TPMS warnings. Or just drop the pressures to the 48/55 Continental values and see if the TPMS system objects (which one really should expect it to).

 

It seems to be unavoidable that reprogramming the Accordo’s TPMS system to match significantly reduced tyre pressures will demand a visit to a Peugeot agent and, if Barry wants that task performed, it would be sensible to see how amenable his local Peugeot agent is to doing this.

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We have an Accordo 120 and the TPMS triggered at 69psi. I really cannot see Elddis going through the approval system for alternative pressures so I doubt that change will be possible. You do get used to the high pressures with time.
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Thank you for all your remarks especially Derek Uzzell.

If I follow Dereks pressures that would be apps a 25 psi drop front and back but I agree this is what the Continental charts recommend.

We have a local vehicle electronics specialist who I will consult and then attempt to lower the pressure to circa 60 and 68.

So if you see an Elddis 120 with a red faced driver trying to silence an alarm and stop warning lights flashing you will know who it is, although I can't be the only owner with this problem.

I will post my results in due course.

Thanks again.

Barry

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Barry Peake - 2018-06-01 9:11 PM

 

...If I follow Dereks pressures that would be apps a 25 psi drop front and back but I agree this is what the Continental charts recommend...

 

Continental charts don’t recommend.

 

Continental’s charts show the inflation-pressure that Continental’s testing has shown to be ‘safe’ for a particular tyre supporting a specific axle-loading. Those values are safe minima, but there’s absolutely no guarantee that using the 'chart-pressure’ will be ‘correct’ for a motorhome.

 

There’s little doubt that using 48psi (front axle) and 55psi (rear axle), instead of 72psi(F) and 80psi®, should soften a motorhome’s ride, but it will also impact on cornering and braking, steering-wheel effort, fuel consumption and tyre wear.

 

If a motorhome owner contacts Continental about tyre pressures, Continental will provide the chart data. But Continental will not instruct the motorhome owner to use those pressures...

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Barry Peake - 2018-06-01 9:11 PM

 

Thank you for all your remarks especially Derek Uzzell.

If I follow Dereks pressures that would be apps a 25 psi drop front and back but I agree this is what the Continental charts recommend.

We have a local vehicle electronics specialist who I will consult and then attempt to lower the pressure to circa 60 and 68.

So if you see an Elddis 120 with a red faced driver trying to silence an alarm and stop warning lights flashing you will know who it is, although I can't be the only owner with this problem.

I will post my results in due course.

Thanks again.

Barry

From your original post (your assumed added axle loads), Barry, I gather you have not taken your van to a weighbridge fully laden, and obtained its actual axle loads and maximum laden weight. I would suggest you do this before adjusting the tyre pressures. Continental's chart gives pressures for actual loads, and it is essential to get those loads at the maximum values you are likely to apply in practice.

 

That implies the maximum number of gas cylinders, full and unused, the fresh water tank full, and all passengers, pets, food, liquids, clothing, camping clutter, books, computers, cameras, etc. etc (in short the lot!), as you would load the van in readiness for an extended trip. This is a load condition that will be transient, but will always reduce as you travel. You may find you are surprised how the load you add is distributed between the two axles, and that the rear axle is far heavier loaded than you might have assumed (this is frequently the case).

 

If you then adopt the tyre pressures to suit that actual load state, it should follow that you eliminate the risk of underinflation relative to axle loads, and will in fact usually be running slightly over inflated, which is the fail-safe condition. With those tyre pressures, you should find that the van's road holding, handling, and ride comfort, are all optimised, with no reduction in safety. If you find the result unfavourable, it will be safe to experiment with higher pressures, up to the originally recommended maxima.

 

Unfortunately, you may also find that the TPMS is triggered by the lower pressures, with resulting alarms. If your dealer/Peugeot can't/won't re-set the system to accommodate Continental's optimum pressures for load, you'll have to drive with ear plugs, or accept the pressures that satisfy the system! Good luck!

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