Tire Pressure Monitor System. I have really enjoyed having this feature on the Volt and no doubt the Ford FE will have it. And the system is much more accurate that I thought it would be. I have found that is typically within a pound of my gauge.
If you are into maintaining your own equipment, and you rotate your own tires, there is a procedure for letting the car learn where each tire is located.
Once you are in the “learn” mode you will go to a specific tire. On the Volt this is the driver side front tire. There is a special tool available that you place against the sidewall and when you press a button it will cause the TPMS valve to send a signal to the car.
On many forums this tool is said to be nothing more than a strong magnet. And you can avoid the cost of the ~$75 relearn tool by using a magnet in its place.
http://www.velocitycorvette.com/technic ... ming-tool/
Well I tested that theory on my Volt. And it did not work for me. I tried two different magnets, one of which was the size of a small brick, and will pick up large tools no problem.
Another work around to the “magnet” trick, is to let air in or out of the tire for 5 seconds.
See for further details:
http://www.chevrolet.com/assets/pdf/own ... owners.pdf
This also did not work. Then I tried 10 seconds. No go. Then I tried 20 seconds. Bingo.
It probably is not the time so much as how much air is let out. It probably takes a certain psi change to trigger the valve to send a signal, so finding a tool that let’s air out or in rapidly is probably key.
On the Volt the car very conveniently indicates to you which tire you should be working on by turning on the lights next to the wheel you need to “trigger.”
You start at driver’s side front, and go to the passenger side front, then passenger side rear, then driver side rear.
Letting air in and out is something of a hassle though, and you definitely need a compressor around to do it. Still less hassle than sitting around at a dealer. Once I replace the tires, I plan on letting Sam's Club do the job for me.