2004 Mercury Mountaineer Owner's Manual - Page 260

Maintenance and Specifications temperature. Contained air temperature is dependent upon several factors such as rate of tire rotation, tire deflection, amount of braking, etc. In similar manner, the tire pressure will decrease if the contained air temperature decreases. For example, if the vehicle is stationary over night with the outside temperature significantly lower than the daytime temperature, the tire pressure may decrease approximately 3 psi (20.7 kPa) for a drop of 30° F (16.6° C) in ambient temperature. This lower pressure value may be detected by the TPMS as being significantly lower than the cold pressure indicated on your vehicles tire label, and activate the TPMS warning for low tire pressure. If the low warning light is on, visually check each tire to verify that no tire is flat. If one or more tires are flat, repair of fix as necessary. If all tires appear to be inflated, carefully drive the vehicle to the nearest location where air can be added to the tires. Turn the ignition to the "off" position. Inflate all the tires to the recommended cold pressure. The system uses radio-frequency to monitor the tire pressure on all tires excluding the spare tire. The sensors transmit the tire pressure readings to the receiver module located in the vehicle. The receiver module then electronically 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 Tire inflation 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. 260 REVIEW COPY: 2004 Explorer (exp), Owners Guide (post-2002-fmt) (own2002), Market: USA English (fus)