Actually, the sensors have accelerometers embedded. They shut down to conserve power. It takes motion for them to start up again. The spare will indeed trigger and report if it is low, but not always.

I'm not sure how long it takes for the TPMS sensors to shut down, but I know I can lower the pressure in my tires in the garage after the Jeep sits for a week and the TMPS will not go off until I back out of the garage. Usually I'm 50 feet down the road or so before they finally trigger. On the other hand, if I air down at the trailhead the warning goes off as soon as the key is turned on.

 

Utah requires TPMS in all vehicles? That doesn't make sense.

 

Sure. But what if you swap out your wheels and tires w/o sensors? They gonna flag you because you drive a vehicle where you constantly air down & up when offroading?

 

I agree as a chevrolet tech in 05 we had tp sensors in our spares and what a headache they would trigger indicators all the time unless we disabled them with
the scan tool. as far as jeeps i must agree that the spare can and has set off my tire light. i also have found it can take a couple of days for it to reset itself. thank god jeeps are not like gm and location specific and after tire movement it doesnt matter where u put a jeep tire

and its a fedral standard for automakers not for us you would not bbelive how many people cant put air in their own tires now adays

 

I am just curious. Is everyone in this thread running the same size, and brand of tires? Did you have the sensors put in your new tires after market? are they the same brand of sensors?

I am just curious because I just swapped my factory wheels and tires for alloy wheels and larger mud terrain tires. i am not sure what the panel on my jeep says but i know my current tires are set at 30psi. I thought about using the sensors in my old tires but then decided against it and bought new replacements. curious if any of these variants could be the reason for everyones different results.

 

Im pretty sure that most vehicles are + or - 5 psi seems to be the standard for most of the cars i see in the shop and on alldata(online auto repair fro the shop ) im running 35 km2s with alum after mrkt whhels with no
issues and in the we recommend no matter what the tire says on the side always run according to tire placard in door jam unless tire manufacture states other wise or load specific.

 

How do you disable it?

 

Here is one way, check out AEV CONVERSIONS' Pro-Cal Tool. It can sustomize the pressure setting for the TPMS System, and even set it to the ZERO setting, which will disable it totally, no more yellow ight...DONE. It does many other things as well. For $150 it is worth every penny. That is what I did to get rid of the light on the dash. Nice to have regular pressure valves.

SLIM

 

Thanks, man - I'll look into that. There's some other things I need to adjust with the new tires.
I just told them at Discount Tire not to worry about putting them in my new wheels. I really didn't want them, and now they're for sale inside some stock sahara wheels and tires.
FWIW - My light didn't come on while driving home from getting the new wheels put on. Of course, I was hauling the old tires and sensors in the jeep at the time. May help with that rolling vs non-rolling discussion. My stock spare on my 2010 Sahara doesn't have one. It's just a regular valve.

 

Maybe the tpms light did not come on due to the tires inside your jeep at the time , as you already stated. I am surprised your spare tire did not have a TPMS Sensor. Most of the 2010's and higher have them in the spare as well. Not sure how high tech Crysler/Jeep made the Wranglers' TPMS System, but some systems use a motion sensor system to where the computer knows which is the spare tire, due to the spare tire having no rotation. The 2011 Patriot actualy has a read out on the dash when the TPMS sensor Light is on showing all Pressures in each tire.

If you upgraded to a bigger tire size, the AEV Pro-Cal Tool can also re-calibrate your speedo , and also be used to update the Jeep's Computer when you change the gear ratio for Automatic Trannys.

Such a pleasure not dealing with those pressure valve stems, when filling up the tires with air, found the orignal TPMS Valve stems very fragile.

My 2 cents 4 Free..


SLIM