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 a minute 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, the light could take up to an hour to turn off after you
have filled your tires to the recommended tire pressure.
For these reasons, the low tire 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 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 of 20 mph (32 km/h) for at least a minute.
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 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 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.
2005 Explorer (exp)
Owners Guide (post-2002-fmt)
USA_English (fus)
Tires, Wheels and Loading
186
(200 pages)
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