Tire Pressure Loss Warning System - Mercedes-Benz Forum
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#1 (permalink) Old 11-08-2008, 05:24 AM
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Tire Pressure Loss Warning System

In Canada, the ML has the Tire Pressure Loss Warning System (TPLWS). How is this different with the TPMS in the States? What PSI is TPLWS using for measurement? How is this calibrated?

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#2 (permalink) Old 11-08-2008, 07:18 AM
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The Canadian system uses the computer to monitor wheel rotation speed, sensing the different speed of a low tire not actual pressure in the tire The other system uses actual pressure sensors on the wheels that monitor tire pressure.

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#3 (permalink) Old 11-08-2008, 08:02 AM
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For some reason, the Canadian ML gets Advanced TPMS. The USA version gets the very basic (old version). With the Advanced version, one can see the exact pressure on each wheel (a graphic model in the main instrument cluster). What's funny, is that for 2007/2008 Mercedes gave the G-Class the Advanced TPMS (a 30 year old model), while the all new for 2006 ML gets the crap old version (but for the USA). I'd love to know the reasoning for this. Also, why does Canada get the tilt down passenger mirror feature, and the ML, G, GL and R in the USA does not get this anymore (it was standard a year or so ago). So odd and maddening!!
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#4 (permalink) Old 11-08-2008, 08:55 AM
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Originally Posted by Deutsch100 View Post
...Also, why does Canada get the tilt down passenger mirror feature, and the ML, G, GL and R in the USA does not get this anymore (it was standard a year or so ago). So odd and maddening!!
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One reason is probably our MLs cost more (about US$52000 equivalent for the base ML350)

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#5 (permalink) Old 11-08-2008, 08:58 AM
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Originally Posted by Vernl View Post
...The other system uses actual pressure sensors on the wheels that monitor tire pressure.
Yes, the Canadian system is more advanced

You can have the equivalent of the old TPMS by purchasing from Canadian Tire now on sale for 50 bucks !

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#6 (permalink) Old 11-10-2008, 09:26 PM
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As far as I know, the Tire Pressure Loss Warning System, as stated above, calculates tire rotation to monitor pressure loss, and only tells you a tire is low and you need to find which one. A Tire Pressure Monitoring System has a transponder in each wheel that communicates with a central computer to warn exactly which tire is low. This specific system is non-serviceable unless you buy the handheld device that allows you to reset the vehicles TPMS computer. If the system shows a tire is low, you simply add the mising air and it resets itself. Another problem you may encounter is the location of the tires if you do a tire rotation. Again, you will need the handheld to reset it.
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#7 (permalink) Old 11-11-2008, 06:54 AM
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Originally Posted by Whosdis View Post
As far as I know, the Tire Pressure Loss Warning System, as stated above, calculates tire rotation to monitor pressure loss, and only tells you a tire is low and you need to find which one. A Tire Pressure Monitoring System has a transponder in each wheel that communicates with a central computer to warn exactly which tire is low. This specific system is non-serviceable unless you buy the handheld device that allows you to reset the vehicles TPMS computer. If the system shows a tire is low, you simply add the mising air and it resets itself. Another problem you may encounter is the location of the tires if you do a tire rotation. Again, you will need the handheld to reset it.
The TPLWS on my wife's M3 specifies which tire is low but doesn't say by how much.

I don't think the newer TPMS systems need to be reset. The transducer in each wheel continuously sends the pressure to its local receiver. The computer just records what each receiver is telling it and warns if any pressure falls outside limits. I believe most manufacturers have now standardized on 433MHz for the frequency and a common protocol for the message, which makes third-party sending units feasible. I sure hope so, as my new winter wheels are equipped with after-market transducers!
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#8 (permalink) Old 11-11-2008, 08:44 AM
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TPMS is in the future for all of our North American cars eventually. The manufacturers need to perfect this technology. So far I've had no difficulties with system in my 2008 C-class.

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#9 (permalink) Old 11-12-2008, 05:37 AM
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My tire pressure warning goes off at 27 PSI, or if I don't remember to check the air pressure regularly before the first freeze arrives. That also happens to coincide with my wife having the car out of town and panicing because it lights off in the morning when she has an early meeting and is running late.
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#10 (permalink) Old 11-12-2008, 07:32 AM
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Quote:
Originally Posted by CJzBenz View Post
My tire pressure warning goes off at 27 PSI, or if I don't remember to check the air pressure regularly before the first freeze arrives. That also happens to coincide with my wife having the car out of town and panicing because it lights off in the morning when she has an early meeting and is running late.
Yep, as it should because 27 PSI is way too low and compromises safe handling, stability, braking, and tire life.

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