Hey guys,
Yesterday I mounted a new set of wheels, tires and TPMS.
This morning I reset my TPC system. On my way in to work the TPC warning lights went off and a moment later the vehicle told me I had a flat tire.

At the next stop I checked the pressure and this is what I found.



I checked and all the pressures were withing a few lbs of each other.

Today at lunch, I reset it again....same thing.


Any ideas?

 

Those values show how far the pressures are off from where the computer thinks they should be given the temperature/pressure algorithm the ECU contains. So you should add one pound to the LF, 5 lbs to LR, and 7 lbs to RR.

I generally fill my tires to 45 lbs or so, let the car sit over night and then bleed them down. I have found that 36 Fr and 42 R when cold keeps the idiot lights off.

 

Hahaha are you serious?
Christ....


I thought it showed actual PSI

 

There is another screen that shows "actual" pressures except those are usually several pounds different than what you'll read on a good tire gauge so you should never use those to set your pressures. The TPMS system is pretty worthless, imo, as it's only practical use I've found is to alert you to a slow leak over an extended time period. The rest of the time it's more like a video game that you've got to figure out how to play in order to keep the lights and chimes off. Moral of the story: use a good gauge and check pressures regularly.

 

Steamboat is right: TPMS is not all that accurate; a good gauge is required. I have seen a 3-5 psi difference between my gauge and TPMS.

 

If you're afraid of heights, don't look down once you find out you're running negative pressure in the tires.

 

OK, OK, I'll say it. Those new tires must really suck

 

My first "face palm" moment.
Thanks guys.