Jeep Grand Cherokee, Operating Information Manual

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maximum inflation pressure molded into the tire
sidewall. Refer to “Tires – General Information”
in “Starting and Operating” 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 limit for any reason, in-
cluding 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 pres-
sure. Once the low tire pressure warning (Tire
Pressure Monitoring Telltale Light) illuminates,
you must increase the tire pressure to the
recommended cold placard pressure in order
for the “Tire Pressure Monitoring Telltale Light”
to turn off. The system will automatically update
and the “Tire Pressure Monitoring Telltale Light”
will turn off once the system receives the up-
dated tire pressures. The vehicle may need to
be driven for up to 20 minutes above 15 mph
(25 km/h) in order for the TPMS to receive this
information.
For example, your vehicle may have a recom-
mended cold (parked for more than three
hours) placard pressure 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 sufficiently low
enough to turn on the “Tire Pressure Monitoring
Telltale Light.” Driving the vehicle may cause
the tire pressure to rise to approximately 28 psi
(193 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 are inflated to the vehicle’s
recommended cold placard pressure value.
CAUTION!
•
The TPMS has been optimized for the
original equipment tires and wheels. TPMS
pressures and warning have been estab-
lished for the tire size equipped on your
vehicle. Undesirable system operation or
sensor damage may result when using
replacement equipment that is not of the
same size, type, and/or style. Aftermarket
wheels can cause sensor damage. Do not
use aftermarket tire sealants or balance
beads if your vehicle is equipped with a
TPMS, as damage to the sensors may
result.
•
After inspecting or adjusting the tire pres-
sure, always reinstall the valve stem cap.
This will prevent moisture and dirt from
entering the valve stem, which could dam-
age the Tire Pressure Monitoring Sensor.
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