01-29-2013, 03:06 PM | #1 |
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Problems with tyrepressure monitoring
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. Last edited by heder; 01-29-2013 at 03:14 PM.. |
01-29-2013, 04:08 PM | #2 | |
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01-29-2013, 05:15 PM | #3 | |
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01-30-2013, 12:54 AM | #5 |
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Well said by ovekam and XavVD....it is not a tyre pressure system per se. It is idirect, so you need at least one wheel to have the ''original'' pressure so it can be compared with the pressure in the other wheels.
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01-30-2013, 03:18 AM | #6 |
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I agree with all the above.
However, I have another (important IMHO) question regarding this: how much does the pressure have to drop in a tyre, before you get the warning message? |
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01-30-2013, 04:15 AM | #7 |
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From experience and also according to my friendly mechanic it has to drop at least 10 psi (for example from 32 psi to 22psi...or even more). Of course this drop refers to RFT tyres which have harder sidewalls...with normal tyres I guess it must be less than 10 psi.
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01-30-2013, 04:17 AM | #8 |
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Wow, this is a big difference. Does this have to do with the sensitivity of the sensor? Can this be adjusted somehow in order to have a warning message when the pressure drops by, let's say, 5 psi?
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01-30-2013, 05:32 AM | #9 |
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It has to do with the required difference in the speed of the wheels, in order to give you a reading. If the tyre is deflated only by 3-4 psi, then the difference in size (and thus speed) is not significant enough to the read by the ABS sensors. And NO, unfortunately it cannot be adjusted. To give you an example, in my Mini Cooper S I got a warning when the pressure was down to 20psi (normal pressure was 34).
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01-30-2013, 05:51 AM | #10 |
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I have had a couple of warnings when running non run flat tires, and the pressure difference was definitely less than 10 psi.
When driving on a track, the pressure can easily change by 10 psi due to heat, so I would not like it to be more sensitive than it is. The point of it is to warn you about punctured tires. |
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01-30-2013, 06:03 AM | #11 | |
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01-30-2013, 07:03 AM | #12 |
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my sensor(s) seem to be a bit off, I get the low tyre pressure warning now and then. I just have to stop and re-initialize the check (not filling up any more air in the tyres), then it's all good again. I've checked tyre-pressure... it's all good, warning still comes on now and then.
By the way, when the low pressure-warning comes, in my case it indicates on the screen that all wheels are low pressure at the same time. Is this how it works, or is the system supposed to tell what wheel specificly lost pressure? |
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01-30-2013, 04:26 PM | #13 |
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01-30-2013, 05:45 PM | #14 | |
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NOTE: For those of us with the indirect system, is not a tyre pressure warning system, it is a puncture warning system.
We still need to regularly check tyre pressures and reset the sytem for accurate tyre working pressures. Particularly as we know all four tyre pressures can go down without any warning gong. Quote:
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04-05-2015, 12:09 PM | #15 |
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Hello, does anybody knows if is it possible to retrofit the tpms sensors and to enable the temperature and pressure reading? You can find those sensors relatively cheap via ebay but i don't know if you just install them and then with coding the system works or if something more is needed (i mean hardware staff).
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04-15-2015, 09:39 AM | #16 | |
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with the f20, the puncture warning will prompt a warning, and i dont find it necessary to get this. http://www.orange-electronic.com/en/...ofit_p409.html |
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04-15-2015, 05:46 PM | #17 |
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I would like to retrofit the original tpms so you can read in real time the tyre pressure and temperature. This is what i want http://www.bmw-sg.com/forums/attachm..._1958532_n.jpg
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