Tire Pressure Monitor System
If your vehicle has the tire pressure monitor system, it
can alert you to a large change in the pressure of
one tire. The system “learns” the pressure at each tire
throughout the operating speed range of your vehicle.
The system normally takes between 45 and 90 minutes
of driving to learn the tire pressures. This time may
be longer depending on your individual driving habits.
Learning need not be accumulated during a single
trip. Once learned, the system will remember the tire
pressures until the system is recalibrated.
After the system has learned tire pressures with
properly inflated tires, the LOW TIRE PRESSURE
message will come on if the pressure in one tire
becomes 12 psi (83 kPa) lower than the other three
tires. The tire pressure monitor system won’t alert you if
the pressure in more than one tire is low, if the
system is not properly calibrated, or if the vehicle is
moving faster than 70 mph (110 km/h).
The tire pressure monitor system detects differences in
tire rotation speeds that are caused by changes in
tire pressure. The system can alert you about a low
tire — but it doesn’t replace normal tire maintenance.
See
Tires on page 5-61
.
When the LOW TIRE PRESSURE message comes on,
you should stop as soon as you can and check all
your tires for damage. (If a tire is flat, see
If a Tire Goes
Flat on page 5-71
.) Also check the tire pressure in all
four tires as soon as you can. See
Inflation -- Tire
Pressure on page 5-62
.
The LOW TIRE PRESSURE message will also be
displayed (while the ignition is on) until you reset
(calibrate) the system.
Don’t reset the tire pressure monitor system without first
correcting the cause of the problem and checking
and adjusting the pressure in all four tires. If you reset
the system when the tire pressures are incorrect,
the system will not work properly and may not alert you
when a tire is low.
Any time you adjust a tire’s pressure, rotate your tires,
or have one or more tires repaired or replaced, you’ll
need to reset (calibrate) the tire pressure monitor
system. You’ll also need to reset the system whenever
you buy new tires and whenever the vehicle’s battery
has been disconnected.
To reset (calibrate) the system: The tire pressure
monitor system can be reset two ways. With the ignition
position at ON, pull the interior lamps control to the
ON and OFF settings three times.
5-63
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