Jeep 2007 Patriot - Manual (Page 296)

based on cold inflation tire pressure. This is defined as
the tire pressure after a vehicle has not been driven for
more than 3 hours - and in outside ambient tempera-
ture. Refer to the “Tires – General Information” in this
section 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 TPM System will warn the driver of a low tire
pressure if the tire pressure falls below the low pres-
sure warning threshold for any reason, including low
temperature effects.
• The TPM System 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 low tire
pressure warning has been illuminated, the tire pres-
sure must be increased to the recommended cold
placard pressure in order for the TPM warning lamp to
be turned off. The system will automatically update
and the TPM warning lamp 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 (25 km/h) to receive this information.
For example, your vehicle may have a recommended
cold (parked for more than 3 hours) placard of 35 °F (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 decrease the tire pressure to
approximately 26 psi (179 kPa). This tire pressure is
sufficiently low enough to turn ON the “Tire Pressure
Monitoring Light”. Driving the vehicle may cause the tire
pressure to rise to approximately 30 psi (207 kPa), but the
“Tire Pressure Monitoring Light” will still be ON. In this
situation, the “Tire Pressure Monitoring Light” will turn
OFF only after the tires have been inflated to the vehicle’s
recommended cold placard pressure value.
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