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The tire pressure will vary with temperature by approxi-
mately 1 psi (7 kPa) for every 12°F (6.5°C). This
means that when the outside temperature decreases,
the tire pressure will decrease. Tire pressure should
always be set based on cold inflation tire pressure. This
is defined as the tire pressure after the vehicle has not
been driven for at least three hours, or driven less than
1 mile (1.6 km) after a three hour period. The cold tire
inflation pressure must not exceed the maximum infla-
tion pressure molded into the tire sidewall. The tire
pressure will also increase as the vehicle is driven. This
is normal and there should be no adjustment for this
increased pressure.
For more information on how to properly inflate the
vehicle’s tires, see
page 247.
The TPMS will warn the driver of a low tire pressure if
the tire pressure falls below the low-pressure warning
limit for any reason, including low temperature effects
and natural pressure loss through the tire. The TPMS
will continue to warn the driver of low tire pressure as
long as the condition exists, and will not turn off until
the tire pressure is at or above the recommended cold
placard pressure.
NOTE:
Once the low tire pressure warning (Tire Pressure Moni-
toring System Warning Light) illuminates, you must
increase the tire pressure to the recommended cold
placard pressure in order for the Tire Pressure Monitor-
ing System Warning Light to turn off.
The system will automatically update and the Tire Pres-
sure Monitoring System Warning Light will turn off once
the system receives the updated tire pressures. The
vehicle may need to be driven for up to 20 minutes
above 15 mph (24 km/h) in order for the TPMS to
receive this information.
For example, your vehicle may have a recommended
cold (parked for more than three hours) placard pres-
sure of 33 psi (227 kPa). If the ambient temperature is
68°F (20°C) and the measured tire pressure is 28 psi
(193 kPa), a temperature drop to 20°F (-7°C) will
decrease the tire pressure to approximately 24 psi
(165 kPa). This tire pressure is low enough to turn on
the Tire Pressure Monitoring System Warning Light.
Driving the vehicle may cause the tire pressure to rise
to approximately 28 psi (193 kPa), but the Tire Pres-
sure Monitoring System Warning Light will still be on.
In this situation, the Tire Pressure Monitoring System
Warning Light will turn off only after the tires are
inflated to the vehicle’s recommended cold placard
pressure value
page 272.
NOTE:
When filling warm tires, the tire pressure may need to
be increased up to an additional 4 psi (28 kPa) above
the recommended cold placard pressure in order to
turn the Tire Pressure Monitoring System Warning Light
off.
CAUTION!
•
The TPMS has been optimized for the original equip-
ment tires and wheels. TPMS pressures and warning
have been established for the tire size equipped on
your vehicle. Undesirable system operation or sen-
sor damage may result when using replacement
equipment that is not of the same size, type, and/or
style. The TPMS sensor is not designed for use on
aftermarket wheels and may contribute to a poor
overall system performance or sensor damage.
Customers are encouraged to use Original Equip-
ment Manufacturer (OEM) wheels to ensure proper
TPMS feature operation.
(Continued)
CAUTION!
•
Using aftermarket tire sealants may cause the Tire
Pressure Monitoring System (TPMS) sensor to
become inoperable. After using an aftermarket tire
sealant it is recommended that you take your
vehicle to an authorized dealer to have your sensor
function checked.
•
After inspecting or adjusting the tire pressure
always reinstall the valve stem cap. This will pre-
vent moisture and dirt from entering the valve
stem, which could damage the TPMS sensor.
NOTE:
•
The TPMS is not intended to replace normal tire
care and maintenance, or to provide warning of a
tire failure or condition.
•
The TPMS should not be used as a tire pressure
gauge while adjusting your tire pressure.
•
Driving on a significantly underinflated tire causes
the tire to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency and tire
tread life, and may affect the vehicle’s handling and
stopping ability.
•
The TPMS is not a substitute for proper tire mainte-
nance, and it is the driver’s responsibility to main-
tain correct tire pressure using an accurate tire
pressure gauge, even if underinflation has not
reached the level to trigger illumination of the Tire
Pressure Monitoring System Warning Light.
•
Seasonal temperature changes will affect tire pres-
sure, and the TPMS will monitor the actual tire pres-
sure in the tire.
SAFETY 173
6
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