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      01-29-2013, 05:15 PM   #3
XavVD
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Drives: 125i M Sport (soon)
Join Date: May 2012
Location: Europe

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Quote:
Originally Posted by heder
Hi All :-)

I have just recently exchanged my original summer tires (Bridgestone Runflat) with normal non-runflat Goodyear Ultragrip 8 tires (205/55/R16). After the service center completed the installation, I recalibrated/initialised the tire pressure in accordance with the instructions in the users manual. During this process, the car confirmed the calibration on the display. After receiving this confirmation message, I then drove the car for more than 10 km to be sure that the tire pressure calibration was completed.
To simulate a significant loss of tirepressure, I then reduced the pressure from 2.4Bar to 1.6Bar on each wheel, and drove another 10 km to let the car perform monitoring and eventually issue a low-pressure warning.
But after completing my test drive, I didn't get any low-pressure warnings from the display, and all 4 tires was still displayed with green colors on the display. -Does anyone know what could be causing this error?


Best regards
Thomas.
The system is indirect TPMS, it means it does use pressure sensor but calculate pressure loss if different rotation speed is noticed by ABS sensor on one wheel compared to the others. If you reduce the pressure of all tires they will still rotate at the same speed so no problem. The engineers make an assumption: there is very low probability to have pressure loss on all wheels at the same time... Obviously you believed it is probable
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