2006 Lincoln Navigator Owner Guide 2nd Printing - Page 254

Tires, Wheels and Loading When inflating your tires When putting air into your tires (such as at a gas station or in your garage), the Tire Pressure Monitoring System may not respond immediately to the air added to your tires. Here are the details: • The tire pressure monitor sensors mounted in your wheels updates your vehicle with tire pressure information only once every minute, therefore it may take up to two minutes of driving over 20 mph (32 km/h) for the light to turn OFF after you have filled your tires to the recommended tire pressure. • If your vehicle has been parked for over 15 minutes, the sensors go into a low power mode to conserve battery life and therefore only transmit about once an hour. If you inflate your tires under these conditions, it may take up to two minutes of driving over 20 mph (32 km/h) for the light to turn OFF after you have filled your tires to the recommended tire pressure. For these reasons, the low tire pressure warning light is NOT a substitute for using an accurate tire gauge when checking and filling your tires. The best way to turn off the low tire pressure warning light is to fill your tires to the recommended tire pressure and drive your vehicle - the tire pressure sensors in your wheels will update your vehicle with the updated tire pressure when your vehicle reaches a speed over 20 mph (32 km/h) for at least two minutes. How temperature affects your tire pressure The Tire Pressure Monitoring System (TPMS) monitors tire pressure in each pneumatic tire. The pressure in each tire is dependent upon several factors, one of them being the contained air temperature (temperature of the air inside the tire). As the contained air temperature increases, the tire pressure also increases. While driving in a normal manner, a typical passenger tire inflation pressure may increase approximately 2 to 4 psi (14 to 28 kPa) from a cold start situation. This increase in tire pressure is due to an increase in the contained air 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 Safety Compliance Certification Label, and 254 2006 Navigator (nav) Owners Guide (post-2002-fmt) USA (fus)