Tire pressure sensor

Each sensor is an integrated unit made up of the tire valve stem, a pressure sensor, and a transmitter. The unit is attached to the inside of the wheel, around the valve stem. The sensor transmits a signal to the control unit when tire pressure is less than 168 kPa (1.7 kgf/cm² , 24 psi). The control unit then turns on the low pressure indicator and the appropriate tire indicator(s). When that tire's pressure is increased to more than 198 kPa (2.0 kgf/cm² , 29 psi), the transmitter stops sending the signal, and the control unit turns the indicators off.