Yeah....I dunno!?!?


I know on the Corvette, the 2005 came out with tire pressure sensors.


On the 2005 and 2006, if you swapped on a different set of wheels with no sensors in them (or with sensors that you didn't do a relearn on to program their ID#s into the TPMS), you could drive for 1 hour (of continuous engine/ignition ON time) before the system would give an alert - and the 1 hour reset every time you shut down and restarted. At that time you'd get an alert that the TPMS was bad, because it hadn't received any signals at all from any of the four sensors - and nobody would drive without any sensors, right?


For the 2007 and 2008 model years that time period went down to 30 minutes, and in 2009 through 2014 cars it went down to 20 minutes.


So....I don't how long our F150s will go before we would get an alert. But if the sensors do program themselves into the TPMS somehow then it would never happen until you had a low pressure, a bad sensor, or a problem with the TPMS module.


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Glad it's not just me, thought for a minute I must be blessed with exceptionally good luck or losing my mind LOL.

There has to be some reason why we didn't have to train new sensors but I have no idea what that is.

 

Corvettes had them long before 05, I worked at Goodyear for 10 years 83-93, they had big ones strapped to the center of the rim with what looked like a huge hose clamp. Don't remember what year model it was but I don't own a time machine so it would have had to been 93 or older. The only other thing I remember about that vette's wheels is the rear wheels were different size than the fronts, couldn't rotate them.


In all fairness trying to compare a Chevrolets electronics to a Fords is problematic at best.

 

Different sensors? better or no so good quality?
Differing frequency? 315mhz as opposed to I think 425mhz???

Also...TPMS sensors do have a shelf life. My motto is when tires are replaced, so are tpms.

 

I absolutely agree with the fact that the sensors wake up and begin to transmit every 60 seconds when the wheels turn faster than 20 mph.


However, if the sensors "wake up", then they obviously "went to sleep" at some time, so the info you quoted doesn't have ALL the info about the operation of the sensors.


As I mentioned in an earlier post, the Vette sensors go into a sleep mode after the car sits still for 15 minutes - and I'm quite sure that our F150 sensors go to sleep in a somewhat similar time period.


Also, the Vette sensors (all the Chevy sensors) transmit once every 60 minutes while in the sleep mode. Then they wake up when driven over 20 mph, just like the F150 sensors.


Whether the F150 sensors transmit once every 60 minutes while in the sleep mode, I dunno - but I can perhaps find out!!!


My truck has been sitting still since I got home about an hour ago. I'll turn on my TPMS tool and see I pick up a transmission from one of my truck's sensors. Hopefully I won't have to wait an hour to get a signal from one, and if don't get a signal within an hour then I guess they just don't transmit every hour in the sleep mode like the other Schrader sensors do.
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What I posted is word for word description and operation from the Ford factory shop manual.

I don't know any other media that would have a better or more complete definition.


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If different frequency we would be getting warning lights, quality I doubt has anything to do with it.

Only have 6200 miles on my oem tires/wheels and only 18 months old, from what I have read the sensor battery has a life span of 7 years.


Just one of those head scratchers we may never figure out, I'm not going to lose any sleep over it. LOL

 

Have you driven over 20 miles at one time since changing them. When i switched my wheels it took 2 days before i got a warning light due to the fact i had stopped somewhere and shut the truck off on my commute. It wasnt until i drove straight home one night where i got the warning.... and i got it at the same spot each day after that; at ~18 miles

 

Shortly after I mounted the new wheels I took her on a 40 min non stop trip @ 60mph.


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You are not alone, i bought new ford branded sensors for my winter wheels. installed them 700 miles ago, never relearned them never set anything. I installed the wheels and tires at home so the tire shop did nothing but install the sensors for me...yet no like or issue thus far?

I've also done a few 2 hour road trips without shutting the truck down..ect since then.