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Tyre monitor system
- Thread starter Lovre212
- Start date
Unless they have changed it, they use the ABS to calculate any loss of air, so no need of sensors in each wheel
This. You can retrofit a proper TPMS apparently (there's another thread on here for that), but the stock system is passive using the ABS sensors to detect if one wheel is spinning faster than the opposite one meaning it's lost air.
Your car has a passive TPMS - as @RADIOTWO and @Alex667 have said, your car’s TPMS uses the ABS sensors to monitor the rotational speed of each wheel. If it detects differences in rotational speed of any of the wheels, it will trigger a warning.
You therefore don’t have a TPMS sensor in each wheel, so you don’t need to fit new sensors to the new wheels you’re planning on fitting to your car.
No need to worry about any sensors, just make sure after the new wheels are fitted you "reset" the TPMS from the menus so it knows to re-learn the wheel speeds.
I don't think it is a poor system, you don't need to know the pressures, all you need to know is if the pressure is lost in any tyre, and the amount, and this system does that.
the nice thing about this system is you don't have a sensor in each wheel, and like me I have a spare set of wheels for winter so no extra cost for spare set
so I think it is a brilliant way of doing it
Agree; no need for the TPMS to tell you what the actual tyre pressures are.
I manually check my tyre pressures when I do the under-bonnet fluid level checks (oil, coolant, washer fluid) - usually every couple of weeks or so when I wash my car.
Maybe many owners don’t do these maintenance checks anymore, but instead rely on the car to ‘tell’ them if something needs topping up? ?
A true TPMS system saves you that walkaround weekly, and you can check them for peace of mind without stopping the car. It was really handy on my Insignia to be able to view tyre pressures whenever I felt like, at whatever speed.
The ABS sensor method is purely from laziness/cost due to regulatory requirement for having SOME system of warning the driver of a low tyre pressure.
Agreed, how can people defend a system that gives you less information.
Even with the True TPMS (as you put it) you still have to do your walk round plus if you do have a loss of pressure with either system you still have to stop the car to see what is causing the drop in pressure and rectify the problem so does not matter how you get to the same result
I don’t recall ever saying that active TPMS fixes the issue for you if your pressure gets low…
I have to admit I didn't know how this was implemented (my previous old car didn't have a system like that), so now I'm worried. How long it will realistically take to detect the pressure issue? I live very close to a motorway (2-3 minutes away), so will it have enough time to detect this before I'm doing 70mph? I thought it will warn you when you start the car...
I think it’s if you’re above 20kph, but it might be higher. I expect it’ll take a pretty substantial drop in pressure to set it off.
Just to show how "amazing" this passive TPMS system is, I got a slow puncture in one of my rear tyres. All the other tyres were at 35 PSI, one sitting at 27 PSI (it was also at 35 PSI a week ago). The passive system hadn't even picked it up... 8 PSI down (almost 1/4 of the air lost) and no warning. An active system would have noticed that right away.
It's obviously not going to be as accurate as a full monitoring system, but then it's just a line of code in the ABS controller. It needs zero maintainace for the life of the car, vs an active system that needs the transponders swapping about, needs coding to the car, and is 100x more likely to malfunction. #
We survived 100 years of driving without any form on monitoring, and if you're a good driver you should be able to notice it through the feel of the car in corners
Or, of course, check your tyre pressures weekly like (some) folk used to (still) do before TPMS. Both active and passive system are a good safety system but like most things these days it does makes people idle.
I’d rather something that takes maintenance once every 6-7 years that actually works though.
It’s no good saying “you don’t need to think about if a) it doesn’t work and b) Means more time doing manual checks every week than being able to press a button and saying ‘yeah that’s fine’ any time you want
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