The tire pressure monitoring system (TPMS) on 2009-13 Ford F-150 pickups monitors the air pressure in the four road tires with wheel-mounted tire pressure sensors. The sensors transmit radio frequency signals to the Smart Junction Box (SJB) approximately every 60 seconds when the vehicle speed exceeds 20 mph (32 km/h). If the vehicle is stationary for more than 30 minutes, the sensor will enter into a "sleep mode" and stop transmitting.
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机译：2009年13月，福特F-150皮卡的轮胎压力监测系统（TPMS）通过轮毂式轮胎压力传感器监测四个公路轮胎的气压。当车速超过20 mph（32 km / h）时，传感器大约每60秒将射频信号发送到Smart Junction Box（SJB）。如果车辆静止不动超过30分钟，则传感器将进入“睡眠模式”并停止发送。
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