Jeep WRANGLER 2017, User Manual

Page: 90 / 292

AUXILIARY DRIVING
SYSTEMS
Tire Pressure Monitor 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 (7.0 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 a vehicle
has not been driven for more than three
hours, or driven less than 1 mile (1.6 km)
after a three-hour period. 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
pressure if the tire pressure falls below the
low pressure warning threshold for any rea-
son, including low temperature effects, or
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 recommended cold
placard pressure. Once the “Tire Pressure
Monitoring Telltale Light” has been illumi-
nated, the tire pressure must be increased to
the recommended cold placard pressure in
order for the “Tire Pressure Monitoring Tell-
tale Light” to be turned OFF.
NOTE:
When filling warm tires, the tire pressure may
need to be increased up to an additional 4 psi
(30 kPa) above the recommended cold plac-
ard pressure in order to turn the Tire Pressure
Monitoring Telltale Light off.
The system will automatically update and the
“Tire Pressure Monitoring Telltale Light” will
extinguish once the updated tire pressures
have been received. The vehicle may need to
be driven for up to 10 minutes above 15 mph
(24 km/h) to receive this information.
For example, your vehicle may have a recom-
mended cold (parked for more than three
hours) air pressure of 35 psi (241 kPa). If the
ambient temperature is 68°F (20°C) and the
measured tire pressure is 30 psi (207 kPa), a
temperature drop to 20°F (-7°C) will de-
crease the tire pressure to approximately
26 psi (179 kPa). This tire pressure is suffi-
ciently low enough to turn ON the “Tire Pres-
sure Monitoring Telltale Light.” Driving the
vehicle may cause the tire pressure to rise to
approximately 30 psi (207 kPa), but the “Tire
Pressure Monitoring Telltale Light” will still
be ON. In this situation, the “Tire Pressure
Monitoring Telltale Light” will turn OFF only
after the tires have been inflated to the vehi-
cle’s recommended cold placard pressure
value.
SAFETY
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