Tire Pressure Monitoring System (TPM)
WARNING: This page is about a different car, the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, and 2002 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
If equipped with the Tire Pressure Monitoring system (TPM), each of the vehicles four wheels will have a valve stem with a pressure sensor and radio transmitter built in. Signals from the tire pressure sensor/transmitters are received and interpreted by the Electronic Vehicle Information Center (EVIC).
A sensor/transmitter in a mounted wheel will broadcast its detected pressure once per minute when the vehicle is moving faster than 20 MPH (32 KM/H). Each sensor/transmitter's broadcast is uniquely coded so that the EVIC can determine the location.