2003 Mercury Mountaineer Owner Guide 1st Printing (Spanish) - Page 529

Maintenance and Specifications Tire pressure monitoring system (TPMS) (if equipped) The tire pressure monitoring system provides the driver with a warning message indicating when tire pressure is severely low or high. This system is a supplement to normal tire maintenance including regular manual inspections. The device will inform the operator of severe low or high inflation pressures, but may not illuminate for less severe discrepancies in inflation pressure. The system uses radio-frequency pressure sensors to monitor the tire pressure on all tires including the spare. The sensors transmit the tire pressure readings to the receiver module located in the vehicle. The receiver module then transmits the status to the message center. For more tire warning information, refer to the Message Center in the Driver controls chapter. This device complies with part 15 of the FCC rules and with RS-210 of Industry Canada. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation. The tire pressure monitoring system is NOT a substitute for manually checking tire pressure. The tire pressure should be checked periodically (at least monthly) using a tire gauge, see Checking the tire pressure in this chapter. Failure to properly maintain your tire pressure could increase the risk of tire failure, loss of control, vehicle rollover and personal injury. Changing tires with TPMS It is recommended that you always have your tires serviced by a dealer or qualified technician. Each tire is equipped with a tire pressure sensor mounted on the wheel inside the tire behind the valve stem. The tire pressure sensor must be unbolted from the wheel prior to tire removal. The sensor can be removed by loosening the nut at the valve stem. Failure to remove the sensor may damage it. The rubber grommet (washer) between the wheel and the tire pressure sensor needs to be replaced when any tire is changed to minimize air leaks. The tire pressure should be checked periodically (at least monthly) using a tire gauge, refer to Checking the tire pressure in this chapter. 242