Lexus 2003 SC430 Owner's Manual page 339

CHASSIS
CAUTION
Keep your tire pressure properly inflated. Otherwise,
the following conditions may occur and cause an
accident resulting in death or serious injuries.
Low tire pressure (underinflation):
D Excessive wear
D Uneven wear
D Poor handling
D Possibility of blowouts from overheated tire.
D Poor sealing of the tire bead
D Wheel deformation and/or tire separation
High tire pressure (overinflation):
D Poor handling
D Excessive wear at the center of the tire tread
D A greater possibility of tire damage from road
hazards
322
The following instructions for checking tire pressure should be
observed:
D The pressure should be checked only when the tires are
cold. If your vehicle has been parked for at least 3 hours
and has not been driven for more than 1.5 km or 1 mile
since, you will get an accurate cold tire pressure reading.
D If you cannot adjust the tire pressure when the tires are
cold, add 10 to 20 kPa more to the front tires and rear tires
than the cold tire pressure, but never exceed the maximum
cold tire pressure molded on the tire sidewall.
D Always use a tire pressure gauge. The appearance of the
tire can be misleading. Besides, tire pressures that are
even just a few pounds off can degrade handling and ride.
D Do not bleed or reduce tire pressure after driving. It is
normal for the tire pressure to be higher after driving.
D Never exceed the vehicle capacity weight. The
passengers and luggage weight should be located so that
the vehicle is balanced.
D Be sure to reinstall the tire valve caps. Without the valve
caps, dirt or moisture could get into the valve core and
cause air leakage. If the caps have been lost, have new
ones put on as soon as possible.
CAUTION
The pressure for the compact spare tire must be 420 kPa
2
(4.3 kgf/cm , 4.2 bar, 60 psi).