The transponder key ECU control type engine immobiliser system consists of the following components.
1.Ignition key (Transponder chip is built in)
The coil in the transponder chip built in the key reacts to the magnetic field produced by the transponder key coil. As a result, electricity is charged and an ID code is transmitted. Therefore, it is not necessary for the transponder chip to use a battery.
Ignition keys are classified into ignition key all-in-one type and separate type. The transponder chip of the separate type is built in the transmitter.
2.Transponder key coil
The transponder key coil produces a magnetic field around the ignition key cylinder and receives the ID code of the key.
3.Transponder key amplifier
According to the signal from the transponder key ECU, the transponder key amplifier allows the current to flow into the key coil and makes it produce a magnetic field.
The transponder key amplifier outputs the ID code of key received by the transponder key coil to the transponder key ECU.
4.Transponder key ECU
Transponder key ECU receives the ID code of key from the transponder key amplifier and checks it with the registered ID code. According to the result of the check, it determines whether the engine can be started and transmits the signal to the engine ECU.
This ECU controls the security indicator light to flash/go off.
5.Engine ECU
According to the engine start permission signal from the transponder key ECU, the engine ECU starts the engine.
6.Key unlock warning switch
This switch detects that the key is inserted into the ignition key cylinder and outputs the signal to the transponder key ECU.
7.Security indicator light