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116 SAFETY
AUXILIARY DRIVING SYSTEMS
TIRE PRESSURE MONITORING SYSTEM
(TPMS)
The Tire Pressure Monitoring System (TPMS)
will warn the driver of a low tire pressure based
on the vehicle recommended cold placard
pressure.
The tire pressure will vary with temperature
by about 1 psi (7 kPa) for every 12°F (6.5°C).
Th
is 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
in
flation pressure must not exceed the maximum
inflation pressure molded into the tire sidewall.
Refer to “Tires” in “Servicing And Maintenance”
for information on how to properly inflate the
vehicle’s tires. The tire pressure will also increase
as the vehicle is driven. This is normal and there
should be no adjustment for this increased
pressure.
The TPMS will warn the driver of a low tire
pr
essure 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.
Tire Pressure Monitoring Display
The TPMS will continue to warn the driver of low
ti
re 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.
Once the low tire pressure warning (Tire Pressure
Monitoring System Warning Light) illuminates,
you must increase the tire pressure to the
recommended cold placard pressure in order for
the Tire Pressure Monitoring System Warning
Light to turn off.
NOTE:
When filling warm tires, the tire pressure may
ne
ed to be increased up to an additional 4 psi
(28 kPa) above the recommended cold placard
pressure in order to turn the Tire Pressure Moni-
toring System Warning Light off.
The system will automatically update and the
T
i
re Pressure 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
(2
4 km/h) in order for the TPMS to receive this
in
formation.
For example, your vehicle may have a
re
commended cold (parked for more than
three hours) placard pressure of 33 psi
(227 kPa). If the ambient temperature is 68°F
(
2
0°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 Pressure
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.
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