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Pontiac 1997 Grand Prix Owner's Manual page 317

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Check Tire Pressure System (If Equipped)
The check tire pressure system can alert you to
a
large
change in the pressure in one tire. The system won't
alert you before you drive that a tire is low or flat. Each
time you start your Pontiac, you must drive 10 to 20
miles (15 to 30
km)
before the system will work
properly.
After you've driven 10 to 20 miles (15 to 30
km),
the
CHECK TIRE PRESS light will come on if the pressure
in o'ne
tire
becomes at least 10 psi (69 kPa) higher or
lower than the other three tires. The check tire pressure
system won't alert you if the pressure in more than
one tire is low or high, or if the system is not
calibrated properly.
If the anti-lock brake system warning light comes on
with the CHECK TIRE PRESS light, the check tire
pressure system isn't working. See your dealer for
service. (Also, see "Anti-Lock Brake System Warning
Light" in
the
Index.)
The check tire pressure system detects differences in tire
rotation speeds that are caused by changes in tire
pressure. It will not alert you if the pressure in more
than one tire is low or high. The system can alert you
about a low tire
--
but it doesn't replace normal tire
maintenance. See "Tires" in
the
Index.
When the CHECK TIRE
PRESS
light comes on, you
should stop as soon
as
you can and check
a l l
your tires for
darnage. (If a tire is flat, see "If a Tire Goes Flat" in the
Index.) Also check the tire pressure in all four
tires as soon
as you can. See "Inflation - Tire Pressure" in the Index.
The light will stay on until
you turn off the ignition or
press the CALIBRATE
TIRE PRESS button.
Don't press the CALIBRATE TIRE PRESS button
without first correcting the cause of the problem and
checking and adjusting the pressure in all four tires. If you
press the button when the tire pressures are incorrect, the
check tire pressure system will not work properly
and
may
not alert you when a tire is low or high.
Any time you adjust a tire's pressure or have a tire
repaired or replaced, you'll need to calibrate the check tire
pressure system. You'll also need to calibrate the system
whenever you buy new tires or have tires repaired.
6-47

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Grandprix 1997