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amer6R wrote: Sat Mar 26, 2022 9:31 am Try driving at higher speed

Mikeso51 wrote: Sun Mar 27, 2022 6:56 pm Johnthe1,

My understanding of how the system works is that it compares the rotation speeds of the wheels with the “set” values, and triggers a warning if there is a significant variation. When you reset the system, it can’t actually register the new settings until the car is moving again. So if you reset the system, then change the tyre pressures without moving the car, then the system will register the last settings when you next drive the car not the ones that you first set. Hope this makes sense. Try resetting the system to say 2 bar all round, then driving the car to register these settings before dropping the pressure in one tyre to test.

Mike

Johntheo1 wrote: Sun Mar 27, 2022 7:29 pm

Mikeso51 wrote: Sun Mar 27, 2022 6:56 pm Johnthe1,

My understanding of how the system works is that it compares the rotation speeds of the wheels with the “set” values, and triggers a warning if there is a significant variation. When you reset the system, it can’t actually register the new settings until the car is moving again. So if you reset the system, then change the tyre pressures without moving the car, then the system will register the last settings when you next drive the car not the ones that you first set. Hope this makes sense. Try resetting the system to say 2 bar all round, then driving the car to register these settings before dropping the pressure in one tyre to test.

Mike

Spot on Mike,

I did that after realizing its ABS derived, I then did a ~ 3 mile run between resetting to 2.0bar and deflating to 1.5bar and doing another mile or so then, it certainly did a extended run in the few years it took to fall from 2.3 bar to 1.9bar but as all tyres fell very uniformly maybe it doesn't see this as a problem?.
My manual states "After a extended driving time with driving different speeds , the system will automatically learn the new values and monitor them"

I'd prefer a system where the "extended" time is only say a day or two but will then flag a alarm even if it requires a differential pressure of 1 bar, at least you will then have some realistic idea of a slow puncture or whatever.

John

Johntheo1 wrote: Mon Mar 28, 2022 8:59 am

Johntheo1 wrote: Sun Mar 27, 2022 7:29 pm

Mikeso51 wrote: Sun Mar 27, 2022 6:56 pm Johnthe1,

My understanding of how the system works is that it compares the rotation speeds of the wheels with the “set” values, and triggers a warning if there is a significant variation. When you reset the system, it can’t actually register the new settings until the car is moving again. So if you reset the system, then change the tyre pressures without moving the car, then the system will register the last settings when you next drive the car not the ones that you first set. Hope this makes sense. Try resetting the system to say 2 bar all round, then driving the car to register these settings before dropping the pressure in one tyre to test.

Mike

Spot on Mike,

I did that after realizing its ABS derived, I then did a ~ 3 mile run between resetting to 2.0bar and deflating to 1.5bar and doing another mile or so then, it certainly did a extended run in the few years it took to fall from 2.3 bar to 1.9bar but as all tyres fell very uniformly maybe it doesn't see this as a problem?.
My manual states "After a extended driving time with driving different speeds , the system will automatically learn the new values and monitor them"

I'd prefer a system where the "extended" time is only say a day or two but will then flag a alarm even if it requires a differential pressure of 1 bar, at least you will then have some realistic idea of a slow puncture or whatever.

John

Still can't raise a alarm, did approx 100 miles after resetting TPI with all at exactly 32 psi, reduced pressure in one (different to previous one) by 14 psi, to 18 psi, drove another 4 or five miles, so is my original thinking vaid, ie, that the pressure must actually fall while the car is in motion to flag this warning?.

• For condition - I do a visual inspection for cuts, bulges in the sidewalls and ‘foreign objects’ such as sharp stones, nails, screws etc. that can become embedded in the tread when I wash my car (usually every couple of weeks). I also carry out the under-bonnet fluid checks as part of my car washing routine.

• Air pressure; I check the tyre pressures monthly and adjust as necessary. When I took delivery of my car, one of the first things I did was to check the tyre pressures. One of then had been left at the ‘transit’ (from the factory) inflation pressure, which was around 50psi . I can only assume the garage overlooked this one tyre for some unknown reason when they carried out the PDI (they missed other things during PDI too). If I hadn’t checked, I could’ve been driving round with an excessively overinflated tyre for around a month!

TrebleTA wrote: Sun Jun 12, 2022 10:05 am It is a funny system yet for me it has worked when I got a friendly bolt in the tyre, was a slow loss in pressure, but triggered as I turned a cornor hit a bump and warning low pressure p.s.r. But there is a system to monitor the pressure better, I did think this was like a vaule sender like on the BMW but no this is more a cheepy but still a little helpfull. Still better with a visual before every drive.