From: SMS on 8 Dec 2009 11:13 My TPMS warning light came on this morning. It also happened to be one the rare sub-freezing days we get in Silicon Valley. The tires are fine. Is it best to ignore the light, or add air to compensate for the lower pressure caused by the cold weather?
From: C. E. White on 8 Dec 2009 11:35 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4b1e7b10$0$1641$742ec2ed(a)news.sonic.net... > My TPMS warning light came on this morning. It also happened to be > one the rare sub-freezing days we get in Silicon Valley. The tires > are fine. > > Is it best to ignore the light, or add air to compensate for the > lower pressure caused by the cold weather? I'd add the air. Be sure to check the spare as well. Both my SO and Sister had the light come on becasue the spare was low. I was under the impression that the warning light only came on if a tire was around 10% to 25% underinflated. Some interesting information on the Toyota system at http://www.toyotatpms.com/index.htm Ed
From: Ray O on 8 Dec 2009 13:14 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4b1e7b10$0$1641$742ec2ed(a)news.sonic.net... > My TPMS warning light came on this morning. It also happened to be one the > rare sub-freezing days we get in Silicon Valley. The tires are fine. > > Is it best to ignore the light, or add air to compensate for the lower > pressure caused by the cold weather? I would check all of the tires, including the spare, with a tire pressure gauge and inflate to at least the pressures indicated in the owner's manual and on the driver's door or glove box door. -- Ray O (correct punctuation to reply)
From: JoeSpareBedroom on 8 Dec 2009 18:51 "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message news:hfm54g$flk$2(a)news.eternal-september.org... > > "SMS" <scharf.steven(a)geemail.com> wrote in message > news:4b1e7b10$0$1641$742ec2ed(a)news.sonic.net... >> My TPMS warning light came on this morning. It also happened to be one >> the rare sub-freezing days we get in Silicon Valley. The tires are fine. >> >> Is it best to ignore the light, or add air to compensate for the lower >> pressure caused by the cold weather? > > I would check all of the tires, including the spare, with a tire pressure > gauge and inflate to at least the pressures indicated in the owner's > manual and on the driver's door or glove box door. > -- > > Ray O How do you eliminate this silly thing entirely? Just replace valve stems with normal ones?
From: SMS on 8 Dec 2009 19:57 Ray O wrote: > I would check all of the tires, including the spare, with a tire pressure > gauge and inflate to at least the pressures indicated in the owner's manual > and on the driver's door or glove box door. All the tires were fine. The light went out by itself. They were all 29.5 to 30 psi, taken with a high quality dial type pressure gauge. It says that they should be 32 psi, and I have no idea what the range is before the light comes on. Maybe it's 10% and one of the tires was at 28 psi early this morning. I recall renting a Chrysler minivan last year in Utah and when we were up near Yellowstone in high elevation the TPMS light came on when there was nothing wrong. I mentioned it when I returned the vehicle and they said that it was a common occurrence in higher elevations (and they gave me one day of the rental free just for telling them about the problem!). It appears as if the TPMS systems don't correct for altitude or temperature.
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