Question for the group
12-28-2004, 03:05 PM
#1
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Can snow impacted in my snow tires while driving, cause the FTM to trip? Twice today the indicator light came on without a real loss in tire pressure.
Has anyone else experienced this yet?
Has anyone else experienced this yet?
12-28-2004, 03:34 PM
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Originally Posted by Jimbo' date='Dec 28 2004, 07:20 PM
Haven't had this problem in California. ;-)
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12-28-2004, 03:44 PM
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Originally Posted by wnrussell' date='Dec 29 2004, 01:34 AM
Version 15 software is supposed to solve the problems related to FTM.
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12-29-2004, 05:30 AM
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My Ride: 535d Titanium Silver, Black Nasca Leather, Servotronic Steering, , De-Chrome, Bi-Xenons including Headlight Washer Jets, adaptive headlights, Advanced A/C, Auto Dim Interior & Exterior Mirrors, Electric Folding Mirrors, Front Centre Sliding Armrest, extended lights package
the ftm checks to see the speed of rotation of the wheels
maybe a wheel packed with snow has a larger diameter than one with no snow on it , therefore the larger diameter wheel rotating more slowly and tripping the ftm (or even slipping in the snow)
what do you think of this theory god or crap?
maybe a wheel packed with snow has a larger diameter than one with no snow on it , therefore the larger diameter wheel rotating more slowly and tripping the ftm (or even slipping in the snow)
what do you think of this theory god or crap?
12-29-2004, 06:04 AM
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I think you're a bit off 
The RPA system reacts to a wheel spinning faster than the three other - e.g. if there is slight wheelspin (quite a lof of wheel spin may occur on snow, and the DSC/traction control usually doesn't notice). And I bet this is why the system is so trigger happy at times.
It would probably be good if the system was able to warn of an over-inflated tyre, but I doubt it has any capacity to do so, as the system's capacity is very limited in the first place. Unless you have a really weird tire, I also doubt enough snow to change the circumference of the tire would stick to the surface of the tire.
The RPA system reacts to a wheel spinning faster than the three other - e.g. if there is slight wheelspin (quite a lof of wheel spin may occur on snow, and the DSC/traction control usually doesn't notice). And I bet this is why the system is so trigger happy at times.
It would probably be good if the system was able to warn of an over-inflated tyre, but I doubt it has any capacity to do so, as the system's capacity is very limited in the first place. Unless you have a really weird tire, I also doubt enough snow to change the circumference of the tire would stick to the surface of the tire.
12-29-2004, 06:16 AM
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The-Man may not be totally off base. If one of the four tires was not as packed with snow and therefore was spinning faster than the other three, perhaps that would trip the FTM. Again a theory, and I don't think it would happen regularly, but that's the only way I could see snow causing the FTM to trip.
12-29-2004, 06:52 AM
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I think slip/wheel spin is the main source of these warnings when driving on snow. The DSC system seems to need quite some time to react to wheelspin before applying the brake to the spinning wheel, and as far as I can see, this could possible cause RPA warnings.