tpms trick pcm
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
They turn into a big PIA on cars like ours that are getting older. If you want to go drag racing and lower your pressure they give you a warning. They fail sometimes without warning after all most cars are between 8-10 yo
I don't ever use run flats but I carry Fix a flat just in case. If you use it the sensor is destroyed.
Racer
Joined: Apr 2007
Posts: 330
Likes: 33
From: Milwaukee WI
They go inactive when not turning to preserve battery life. From the service manual:
"When the vehicle is stationary the sensors internal roll switches are open, which puts the sensors into stationary mode. In this mode the sensors transmit once every 60 minutes. As vehicle speed increases, centrifugal force closes the sensors internal roll switches, which puts the sensors to go into drive mode. In this mode the sensors transmit once every 60 seconds."
"When the vehicle is stationary the sensors internal roll switches are open, which puts the sensors into stationary mode. In this mode the sensors transmit once every 60 minutes. As vehicle speed increases, centrifugal force closes the sensors internal roll switches, which puts the sensors to go into drive mode. In this mode the sensors transmit once every 60 seconds."
I just rebuilt 2 of my sensors to put new batteries in and put my autocross, non TPS equipped wheels/tires on while doing so. Driving along with the TPS in the passenger seat yields nothing. Putting the TPS in a sock with the ignition on, then spinning the TPS around in the sock gives me a flat tire message. I doubt the tube thing would work, or else I would have gotten a flat message while they were in the car.
My shop charged $25 total to dismount and remount with TPS, and that's in 2 parts. Would have been $20/tire if I had it done at the same time. Even the expensive shops only wanted $35/tire. Why spend the cost of 4 TPS to defeat the system when you could have a working system for another ~$150?
