Tire Monitoring System: Description and Operation
GENERAL INFORMATIONFEATURE
^ Warns driver of low tire pressure by illuminating the TPMS warning light on the combination meter
^ Warns driver of TPMS problems by flashing the TPMS warning light on the combination meter
TPMS CONSTRUCTION DIAGRAM
The Tire Pressure Monitoring System (TPMS) consists of TPMS transmitters (tire pressure sensors) installed in tires, TPMS antenna built in the TPMS receiver, and a TPMS warning light on the combination meter. The TPMS antenna receives radio frequency signal output from the TPMS transmitters, the TPMS receiver interprets the signals and detects abnormality of tire pressure and/or the system, and the TPMS warning light illuminates or flashes to alert.
TPMS OPERATIONAL CHARACTERISTICS
^ The TPMS receiver monitors the tire pressure of road tires except compact spare tire.
^ The TPMS transmitter includes a driving G sensor that senses tire rotation. The TPMS receiver can determine which tires are rotating (road tire) and stationary (spare tire).
^ The recommended cold tire pressure at normal condition for Endeavor is 220 kPa (32 psi). The TPMS warning light will turn ON and DTC C1912/C1922/C1932/C1942/C1952* will be stored in memory when the air pressure in any road tire is below 174 kPa (25.3 psi).
NOTE: *Vehicles with 18-inch spare wheel and tire.
^ The TPMS warning light will turn OFF and the DTC C1912/Cl922/Cl932/Cl942/Cl952 in memory will be eliminated when the tire pressure is increased to at least 190 kPa (27.5 psi).
NOTE: *Vehicles with 18-inch spare wheel and tire.
^ Customers may experience what appears to be an "intermittent" tire pressure warning light because the air pressure in the tires normally fluctuates under various operating conditions:
^ In cold weather, tire pressure will become lower due to the ambient temperature, and the TPMS warning light will turn ON if tire pressure drops below 174 kPa (25.3 psi). The tire pressure will increase after driving (tires warm up), and the TPMS warning light will turn OFF.
Regardless of the ambient temperature, set the tire pressure to 220 kPa (32 psi) with the tires cold [vehicle has been parked for at least three hours or driven less than 1.6 kilometers (one mile) after having been parked for three hours].
NOTE: Tire pressure changes at slightly less than 6.9 kPa (1 psi) per 5.5 degrees C (42 degrees F) of ambient temperature change.
For example, climates with seasonal temperatures that vary from 32 degrees C (90 degrees F) in the summer to -12 degrees C (10 degrees F) in the winter have a 44 degree Celsius (80 degrees Fahrenheit) temperature change. This can result in an approximate 55 kPa (8 psi) change in tire pressure. In this example:
^ If the tire pressure was set when the ambient temperature was 32 degrees C (90 degrees F) in the summer, it can be about 165 kPa (24 psi) on the coldest day in the winter. This will cause the TPMS warning light to turn on.
^ If the tire pressure was set when the ambient temperature was - 12 degrees C (10 degrees F) in the winter, it can be about 275 kPa (40 psi) on the hottest day of the summer. This will create a rougher ride.
The important point is that customers should have their tire pressure seasonally adjusted.