Tire pressure sensor
WARNING: This page is about a different car, the 2008 Acura TSX and 2007 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
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 the internal tire information to the control unit once every 60 seconds. When the TPMS control unit receives tire pressure of less than: Front 175 kPa (1.8 kgf/cm2 , 25 psi), rear 168 kPa (1.7 kgf/cm2 , 24 psi) the control unit then turns on the low tire pressure indicator and the appropriate tire(s) indicator. When that tire's pressure is increased to more than: Front 200 kPa (2.0 kgf/cm2 , 29 psi), rear 190 kPa (1.9 kgf/cm2 , 28 psi) the transmitter sends tire pressure to the control unit, and then the control unit turns the indicators off.