TIRE PRESSURE WARNING SYSTEM GENERAL


  1. OUTLINE


    1. Since tire pressure decreases over time, regular adjustments are necessary. When the tire pressure warning system detects that the tire inflation pressure has dropped lower than a threshold, it will illuminate the tire pressure warning light to warn the driver.

    2. A direct-sensing type tire pressure warning system is used.

    3. The 4 tire pressure warning valve and transmitters each send tire inflation pressure, temperature and ID code information to the tire pressure warning ECU and receiver.

    4. The tire pressure warning ECU and receiver, which consists of an antenna, a receiver, and an ECU, monitors the tire pressure warning valve and transmitters in each of the 4 tires except for the spare tire.

    5. The operation of the tire pressure warning system includes a warning function, initial check function, initialization function and diagnosis function.

    6. The cycle with which the information is sent from a tire pressure warning valve and transmitter to the tire pressure warning ECU and receiver is determined as follows based on the travel mode and the acceleration sensor built into each tire pressure warning valve and transmitter. Since the acceleration sensor is used only to determine if the vehicle is being driven, the rate of acceleration is not sent to the tire pressure warning ECU and receiver.

      Travel Mode Transmission Cycle
      While stopped*1 1 time / 1.5 min
      While traveling*2 4 times / 1 min

      Tech Tips

      *1: When the centrifugal acceleration of the acceleration sensor is less than 8G.

      *2: When the centrifugal acceleration of the acceleration sensor is 8G or greater.

  2. MAJOR DIFFERENCE


    1. The new models have been modified from the previous models as shown below:


      1. A tire pressure warning system has been adopted on all models for Europe.

  3. PRECAUTION


    1. The system is disabled in the following conditions: (When the condition becomes normal, the system will work properly.)


      1. When all of the tires and wheels that have the tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.

      2. When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.

      3. When the tire pressure is 350 kPa (relative pressure) or more.

      4. When the transmitter battery is depleted. (Battery life: approximately 10 years)

    2. The system may become disabled in the following conditions: (When the condition becomes normal, the system will work properly.)


      1. When electric devices or facilities using similar radio frequencies are nearby.

      2. When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.

      3. When a window tint that affects radio wave signals is installed.

      4. When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housings.

      5. When non-genuine wheels are used.

      6. When tire chains are used.

      7. When aftermarket tire repair sealant is used.

    3. The tire pressure warning light may illuminate due to natural pressure loss caused by air passing through the tires or by changes in tire pressure caused by temperature fluctuations. When adjusting tire pressure, please be aware of the driving conditions and temperature conditions. The tire warning light is prone to illuminate especially in late autumn and during winter.