ENGINE IMMOBILISER SYSTEM(w/o Entry and Start System) SYSTEM DESCRIPTION


  1. ENGINE IMMOBILISER SYSTEM DESCRIPTION


    1. The engine immobiliser system is a system for preventing theft of the vehicle. The engine immobiliser system utilizes the main body ECU (network gateway ECU) and combination meter assembly to store a key ID. When an improper key is used to attempt to start the engine, the main body ECU (network gateway ECU) sends a fuel cut and starter cut signal to the ECM, making it impossible to start the engine.

  2. FUNCTION OF MAIN COMPONENTS

    Component Outline
    Main body ECU (network gateway ECU) Checks the key ID received from the transponder key amplifier to assess whether it matches a key ID that has already been registered. At the same time, data is exchanged with the combination meter assembly to check whether the key ID matches the key ID stored in the combination meter assembly. When both key IDs match, the main body ECU (network gateway ECU) sends an engine start permission signal to the ECM.
    Combination meter assembly*1 Checks the key ID received from the main body ECU (network gateway ECU) and the key ID stored when the key was registered, and sends the results of this check to the main body ECU (network gateway ECU).
    Transponder key ECU assembly*2 Checks the key ID received from the main body ECU (network gateway ECU) and the key ID stored when the key was registered, and sends the results of this check to the main body ECU (network gateway ECU).
    Transponder key amplifier When the key is inserted into the ignition key cylinder, receives the key ID from the antenna coil, and outputs the key ID code boosted in the amplifier to the main body ECU (network gateway ECU).
    ECM Starts the engine based on the ID results collected from the main body ECU (network gateway ECU).
    Un-lock warning switch assembly Detects whether the key is in the ignition key cylinder and outputs the results to the main body ECU (network gateway ECU).

    • *1: w/o Transponder Key ECU Assembly

    • *2: w/ Transponder Key ECU Assembly

  3. SYSTEM FUNCTION


    1. When the main body ECU (network gateway ECU) detects that the un-lock warning switch assembly is on, it sends power to the transponder key amplifier, which magnetizes the area around the antenna coil. The transponder chip inside the key grip uses the electromotive force generated by this magnetism to output a key ID signal. The transponder key amplifier receives the key ID signal, which is boosted by the amplifier and sent to the main body ECU (network gateway ECU). The main body ECU (network gateway ECU) checks whether the key ID received from the transponder key amplifier matches the registered key ID. Simultaneously, the main body ECU (network gateway ECU) sends the key ID to the transponder key ECU assembly*1 or combination meter assembly*2. The transponder key ECU assembly*1 or combination meter assembly*2 compares the key ID to those it has stored, and sends the results of this comparison to the main body ECU (network gateway ECU). When both ID codes match, the engine immobiliser system is canceled, and the engine start control (fuel injection and starter control) is placed on standby.


      • *1: w/ Transponder Key ECU Assembly

      • *2: w/o Transponder Key ECU Assembly