TIRE PRESSURE WARNING SYSTEM PRECAUTION


  1. TIRE PRESSURE WARNING ECU AND RECEIVER EXPRESSIONS


    1. The type of tire pressure warning ECU and receiver used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

      Vehicle Specification Part Name in Manual Actual Part Name
      for ECE-R64 Type Tire pressure warning ECU and receiver Electrical key and tire pressure monitoring system receiver assembly

  2. TIRE PRESSURE WARNING SYSTEM PRECAUTION


    1. Tire pressure decreases naturally over time, which also occurs in vehicle models without a tire pressure warning system.

      Tech Tips

      Tire pressure decreases by approximately 5 kPa (0.05 kgf/cm2, 0.7 psi) to 10 kPa (0.1 kgf/cm2, 1.5 psi) per month.

    2. It is necessary for the tire pressures to be adjusted periodically.

    3. In winter, tire pressure may decrease due to low ambient temperatures (tire pressure decreases by approximately 10 kPa (0.1 kgf/cm2, 1.5 psi) for every 10°C (18°F) drop in the ambient temperature). Therefore, the tire pressure warning system is more likely to indicate a warning if the tire pressures are not adjusted appropriately. If the daily temperature variation is large, increase the pressure of the tires so that the tire pressures are suitable under cold conditions. As a result, unnecessary tire pressure warning operations should decrease.

    4. Always use a new grommet and valve core when installing a tire pressure warning valve and transmitter to ensure the sealing performance.

    5. When one or more of the tire pressure warning valve and transmitters or the tire pressure warning ECU and receiver is replaced, the transmitter IDs for all of the tire pressure warning valve and transmitters must be re-registered. Before registering the transmitter ID of the new tire pressure warning valve and transmitter, check the Data List and record all of the transmitter IDs that are already registered.

    6. Use only a specified cap. If an unspecified cap is used, it may seize to the tire pressure warning valve and transmitter.

    7. Depending on the tire type, the system may not function properly even if the specified wheels are used.

    8. To prevent damage to the tire pressure warning valve and transmitter, make sure that the tire pressure warning valve and transmitter does not interfere with the tire bead when installing or removing a tire.

    9. To prevent damage to the tire pressure warning valve and transmitter, before disengaging the tire bead or removing the tire from the wheel, drop the tire pressure warning valve and transmitter into the wheel.

    10. ID Switching Function:


      1. If ID switching (Main ←→ 2nd) is performed, the data stored inside the tire pressure warning ECU and receiver is reset.

        Note

        If the tire pressure warning system is malfunctioning, make sure to perform troubleshooting for the system before performing ID switching (Main ←→ 2nd). (Make sure to perform ID switching after the malfunction has been resolved.)

      2. It is not possible to perform ID switching if only the main set of tires is registered.

      3. Whether the vehicle is equipped with an ID switching function or not can be determined by reading the Data List.

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  3. NECESSARY PROCEDURES WHEN REPLACING PARTS


    1. ID Registration

      When replacing the tire pressure warning valve and transmitter and tire pressure warning ECU and receiver, perform ID registration for the tire pressure warning valve and transmitter.

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    2. Initialization

      After performing ID registration for the tire pressure warning valve and transmitter, make sure to initialize the tire pressure warning system.

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