Tire Pressure Monitoring System (TPMS)
The purpose of the tire pressure monitoring system, TPMS, is to enable the driver to have optimum tire pressure by giving a warning when the pressure in any of the tires becomes too low. Correct tire pressure is important for:
- achieving good fuel economy
- achieving optimum comfort and good driving characteristics
- preventing flat tires due to too low tire pressure.
The function is integrated in the Upper electronic module (UEM). Sensors are installed together with the air valve on each wheel to measure the air pressure in the tires.
The system shall be regarded as a helpful tool for the driver to maintain correct tire pressure. The system shall NOT be regarded as a warning system that some serious vehicle malfunction has occurred.
No tire seals completely tight - there is always some minor leak since the tire can never seal tight against the rim. When inflating the tires with air, try to make sure that all tires have the same temperature as the outdoor temperature. Also, do not use so-called "Comfort pressure" as this gives a tire pressure that is too close to the limit value for the monitoring system. This means that even minor changes in temperature or load can result in tire pressure becoming too low for what the system considers acceptable.
"Comfort pressure" may also have a negative impact on the vehicle's driving characteristics. When inflating tires, inflate to the pressure indicated on the decal on the body or in the owner's manual. The pressure is developed with consideration of fuel economy, comfort, and safety. Therefore, do not use another pressure. If the decal is missing or damaged, order and install a new one. This is especially important on vehicles with TPMS.