2007 Jeep Liberty Owner's Manual - Page 263

STARTING AND OPERATING 263 The TPM System will warn the driver of a low tire pressure if the tire pressure falls below the low pressure 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 tire pressure. Once the "Tire Pressure Monitoring Telltale Light" has been illuminated, the tire pressure must be increased to the recommended cold tire pressure in order for the "Tire Pressure Monitoring Telltale Light" to be turned 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 has a recommended cold (parked for more than 3 hours) tire 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 have been inflated to the vehicle's recommended cold tire pressure value. NOTE: Seasonal temperature changes will affect tire pressure, and the TPM system will monitor the actual tire pressure in the tire. 5