When the tire pressure warning light comes on solid and the message center displays “LOW TIRE PRESSURE,” check the air pressure of all tires and adjust to the specified cold pressure listed on the vehicle certification label (found on the driver’s door or door pillar). The tire pressure may drop enough to be detected by the TPMS, which will activate the low pressure warning light. Because tire pressures fluctuate with temperature changes, tire pressures must be set when the tires are at outdoor ambient temperatures. NOTE: As ambient temperature decreases by 6 degrees Celsius (10 degrees Fahrenheit), tire pressure decreases 1 psi (7 kPa). Other non-OEM modifications (roll cages, service barriers, part racks, ladder racks, etc.).Non-OEM-equipped run-flat tires installed.Non-OEM wheels are installed (aftermarket rims).Tire pressure sensor is installed incorrectly.Incorrect tire pressure sensor is installed.Spare tire is installed as a road wheel.Tire pressure sensor is missing or damaged.Under the following conditions, the TPMS may not function properly: The sensors are attached to the portion of the valve stem located inside the wheel with a T10 Torx screw. If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped).Īll tire pressure sensors are battery-operated. If the vehicle is stationary for more than 30 minutes, the sensor will enter into a “sleep mode” and stop transmitting.Įach tire pressure sensor transmission is compared against a low-pressure limit (pressure listed on the vehicle certification label minus 25%, which will be about 6 psi to 9 psi). The sensors transmit radio frequency signals to the smart junction box (SJB) approximately every 60 seconds when the vehicle speed exceeds 20 mph (32 km/h). The tire pressure monitor system (TPMS) monitors the air pressure in the four road tires with wheel-mounted tire pressure sensors. SPECIAL TOOLS NEEDED? A TPMS activation tool (204-363) must be used. SUBJECT VEHICLES: Ford Expedition 2011-16 Ford Expedition EL 2011-12 Lincoln Navigator 2011-16 and Lincoln Navigator L 2011-12.
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