Check your air pressure!

[ROCKLAND TOYOTA]

YOUR 2009 doesn't have TPMS? Also if the tires were set to that 27 psi your light would have been on.....

[YarisOwnersDad]

Originally Posted by ROCKLAND TOYOTA

YOUR 2009 doesn't have TPMS? Also if the tires were set to that 27 psi your light would have been on.....

Don't know if I have the tire pressure monitoring or not. I didn't specifically ask for it, so unless it is standard, I don't have it.

There was no warning light. Don't those sensors look for DIFFERENCES in tire pressure among the four tires, rather than look for some specific minimum pressure threshold? The tires were very uniform in pressure when I checked them this morning. They were all kind of in between the 26 psi mark and the 27 psi mark. That's what makes me think they were set that way.

Tom

[Yaris Hilton]

They measure "gauge pressure" in each tire. I think they go off when the pressure drops below 24 PSI, which is down 25% from the recommended 32 PSI. The Yaris has a basic TPMS system that can't tell you which tire(s) went down, only that one or more is low.

[H3LlIoN]

Originally Posted by YarisOwnersDad

Don't know if I have the tire pressure monitoring or not. I didn't specifically ask for it, so unless it is standard, I don't have it.
Tom

If it's a USDM, then it has TPMS. (TPMS became mandatory in 08)

The Yaris TPMS is set to go off at 28/29 psi.


This info is as provided by my roomate, who is a Toyota/MCEP certified master mechanic, currently employed with Toyota.