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flashing air pressure light |
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bryandthomas 
MINI Motorer 
Joined: February/22/09 Location: Seattle Status: Offline Points: 23 |
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 Topic: flashing air pressure lightPosted: March/24/09 at 1:51am |
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Driving this morning my tire pressue light started blinking. I pulled over to inspect my tires and everything looked fine. I then drove to the next exit and checked tire pressure and all were over 40 psi. That seemed a bit high. Does the light come on at high pressure?
I have a 2002 MCS. Bryan |
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Zippy
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PSMINI Member Joined: April/13/08 Location: Ferndale Status: Offline Points: 212 |
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Posted: March/24/09 at 4:18am |
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Bryan -
The light is not actually triggered by pressure but by a difference in rotation speed among the wheels. The system uses the ABS sensors to read wheel speed. If a tire is low it will rotate at a different speed than the others. 40 psi is high, should be 35 but if they are all the same pressure with the same mileage on them it should not trigger the light. If you spin the tires a bit much it can trigger the light as well. Check the pressure and reset the light, button by the e-brake handle. I cant remember if you push it and hold it while turning the key to on, with out starting or what, but the owners manual tells you how to do it. Here's a few links to look at.... http://tech.bentleypublishers.com/thread.jspa?threadID=33375&tstart=15 http://www.northamericanmotoring.com/forums/stock-problems-issues/30335-tire-pressure-light-keeps-flashing.html Good luck! |
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06 MCS Royal Gray, MINI Fini Sportlink - Mostly Harmless
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johnf36
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PSMINI Member Joined: August/30/07 Location: Ephrata, Wa. Status: Offline Points: 8612 |
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Posted: March/24/09 at 4:23am |
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No it comes on when the rotational diameter has changed. Hence if the tire pressure changes the rolling diameter changes. I am not sure to what extent it is linked to the ABS just that it works with the braking system. The new Gen 2 Minis have a pressure sensor mounted inside of the tire that reads pressure.
John |
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If everything seems under control, you're just not going fast enough.
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bryandthomas
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Joined: February/22/09 Location: Seattle Status: Offline Points: 23 |
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Posted: March/24/09 at 6:46am |
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Huh. Okay well they are all the same tire and I know for a fact they were all put on at the same time since i have the receipt from the previous owner purchasing them.
So it could just be electrical gremlins or I could need a new CV joint...great. I reset it and I guess I will keep an eye on it. Thanks for the help guys! Bryan |
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garumph
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PSMINI Member Joined: October/15/06 Location: Federal Way Status: Offline Points: 1083 |
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Posted: March/24/09 at 7:52am |
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My tire light goes on every time I swap my racing tires with my regular or winter tires. I just reset it and go my merry way. I always check the pressure when I mount the tires but they have enough difference somewhere to trigger the alarm.
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Gordon
Clifford, '14 Countryman All4 S Hunka Burning Love, '12 Coupe S, Burnt Orange Flames, '05 MC Black |
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johnf36
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PSMINI Member Joined: August/30/07 Location: Ephrata, Wa. Status: Offline Points: 8612 |
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Posted: March/24/09 at 8:28am |
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Just some thoughts I would guess you are running stock rims so using eccentrics would not be an issue I am guessing. You did not say anything about vibration so I would think we could rule out a bent rim. The only other thing for me during the winter mine goes off sometes when I get snow build up.
John |
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If everything seems under control, you're just not going fast enough.
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onramp
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PSMINI Member Joined: November/19/06 Location: Renton, WA Status: Offline Points: 2321 |
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Posted: March/24/09 at 11:23am |
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I get the tire pressure light and/or ABS light with wheelspin. It used to take a bunch of wheelspin, but now just a little bit will do it. The book says wheelspin with limited slip will confuse the computer into thinking there is a rotational difference. Can't figure out what the heck is going on with the ABS.
Think back - get a little spin going around a corner, or punch it in second on the wet onramp?? Restart the car - all lights off. My car..? Methinks the car may be haunted buy the ghosts of tires past... Edited by onramp - March/24/09 at 11:25am |
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2006 Hyper Blue JCW
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bryandthomas
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Joined: February/22/09 Location: Seattle Status: Offline Points: 23 |
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Posted: March/24/09 at 12:48pm |
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That's actually reassuring. The car came with a quaife limited slip diff and I was driving in the wet so that could be the cause of the light.
Thanks Bryan |
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Baxter
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Joined: October/15/07 Location: Everett Status: Offline Points: 246 |
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Posted: March/24/09 at 1:43pm |
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I have had mine go off in large amounts of rain / wet roads as well... 3 times actually where the tires have been fine...
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Formerly known as a MINI owner... But no longer... Now I am just a lurker
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RickB
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Joined: May/20/05 Location: Shoreline, WA Status: Offline Points: 226 |
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Posted: June/03/09 at 3:24am |
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My light has never flashed, but it did come on a couple of weeks ago. No rain or snow or spinning wheels. I pulled off into a level parking lot and inspected the tires. They all looked the same, so I reset the light and went on my way. Nearing home, I pulled into a gas station to put a gauge on the tires, and while one was a single psi lower than the others, no sign of a problem. A few years ago (actually three years and two months ago, as it was our wedding day
 ), the light came on and the tires all showed the same psi that time, too. The next morning, one tire was flat. How does that work? The system is so smart, it knows? Edited by RickB - June/03/09 at 3:25am |
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'02 Cooper S, Alta pulley, Alta CAI, M7 brace, Madness brace, One-ball, D1 Spec Throttle Controller, ExtremeContact DW, Koni FSD, Boot Box, Glove Box Organizer . . .
Diligentia, Vis, Celeritas |
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Montster
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Joined: April/11/09 Location: Wenatchee Status: Offline Points: 184 |
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Posted: June/03/09 at 10:28am |
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Monte and Paige 07 MCS DKS,All pkgs, 6spd Alta CAI 19mm swaybar
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onramp wrote: