TIRE PRESSURE WARNING SYSTEM SYSTEM DESCRIPTION


  1. DESCRIPTION OF SYSTEM


    1. When the tire pressure warning system detects that the tire pressure of a tire becomes lower than the threshold, it will inform the driver using a warning light.

    2. The tire pressure warning ECU and receiver receives the transmitter ID, temperature and tire pressure information from the tire pressure warning valve and transmitters shown in the following illustration. This information is used to determine when the pressure in one of the tires has dropped.

      A004KZ3E03
    Text in Illustration
    *1 Tire Pressure Warning ECU and Receiver *2 Tire Pressure Warning Valve and Transmitter
    *3 Combination Meter Assembly - Tire Pressure Warning Light *4 Main Body ECU (Network Gateway ECU)
    *5 Tire Pressure Warning Reset Switch - -
    *a Front - -

  2. DESCRIPTION OF REGISTRATION


    1. When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.

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

  3. FUNCTION OF MAIN COMPONENTS

    Component Function
    Tire Pressure Warning ECU and Receiver

    • Receives the data from the tire pressure warning valve and transmitter and monitors the tire pressure.

    • When the tire pressure warning ECU and receiver detects a drop in the tire pressure or a system malfunction, it outputs the respective signal to the combination meter assembly.

    • When the tire pressure warning ECU and receiver detects a problem with the vehicle speed signal, it uses changes in the signal strength from the tire pressure warning valve and transmitter as a judgment standard. If the ECU detects any changes in the signal strength from the tire pressure warning valve and transmitter, it determines that the vehicle is being driven.
    Tire Pressure Warning Valve and Transmitter Detects the pressure and internal temperature of the tire and transmits the measured values and the ID code to the tire pressure warning ECU and receiver.
    Tire Pressure Warning Reset Switch The appropriate air pressures of the tires currently mounted on the vehicle are stored in the tire pressure warning ECU and receiver by operating the tire pressure warning reset switch.
    Combination Meter Assembly Transmits the tire pressure warning light signal to the tire pressure warning ECU and receiver.
    Tire Pressure Warning Light

    • Illuminates after blinking for 1 minute to warn the driver in accordance with the signal from the tire pressure warning ECU and receiver.

    • Displays 2-digit Diagnostic Trouble Codes (DTC).
    Main Body ECU (Network Gateway ECU)

    • The main body ECU (network gateway ECU) and tire pressure warning ECU and receiver are connected using 2 direct lines that they use to communicate with each other.

    • The main body ECU (network gateway ECU) is connected to the combination meter assembly via CAN No. 1 bus.