Auxiliary Driving Systems; Tire Pressure Monitoring System (Tpms) - Jeep Compass Operating Information Manual

WARNING!
HDC is only intended to assist the driver in
controlling vehicle speed when descending
hills. The driver must remain attentive to the
driving conditions and is responsible for
maintaining a safe vehicle speed.

AUXILIARY DRIVING SYSTEMS

Tire Pressure Monitoring System
(TPMS)
The Tire Pressure Monitor System (TPMS) will
warn the driver of a low tire pressure based on
the vehicle recommended cold placard pres-
sure.
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 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 inflation pressure molded into the tire
sidewall. Refer to "Tires – General Information"
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
88
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, or natural pres-
sure 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.
Once the low tire pressure warning (Tire Pres-
sure Monitoring Telltale Light) illuminates, you
must increase the tire pressure to the recom-
mended 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 updated tire
pressures.
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
placard pressure in order to turn the Tire
Pressure Monitoring Telltale Light off.
The vehicle may need to be driven for up to
10 minutes above 15 mph (24 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 30 psi (207 kPa). If the
ambient temperature is 68°F (20°C) and the
measured tire pressure is 27 psi (186 kPa), a
temperature drop to 20°F (-7°C) will decrease
the tire pressure to approximately 23 psi
(158 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 27 psi
(186 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.
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
placard pressure in order to turn the Tire
Pressure Monitoring Telltale Light off.