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Friday, 4 March 2016

Engine Immobilizer

Engine immobilizer is an anti-theft security system installed in a vehicle to prevent the vehicle from starting the engine unless the right key is present. It prevents the vehicle from theft by old methods such as hot wiring. Honda was the first vehicle manufacturer to commercially introduce engine immobilizer system in its vehicles in 1990.

This system uses a key which has a unique code on a transponder chip installed in it. Once you insert the key in the ignition switch, the chip transmits the unique code to the vehicle. The vehicle ignition will only start when the transponder chip code in the key matches the code in the engine immobilizer. The Electronic Control Unit (ECU) won’t activate the fuel supply system and the ignition system if the code in the key does not match the code in the immobilizer.

Some modern cars have keyless ignition switch (start-stop button). These cars have a smart key fob which transmits the code to the vehicle and then to the immobilizer.

When the key is inserted, the internal circuit in the key is activated by an electromagnetic field. As a result, current flows through the circuit and carries the unique binary code to the ECU. The ECU after verifying the codes, activates the fuel supply and ignition systems.

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