Some models of immobilisators the oldest are solenoid, the only thing you have to do is to send it positive from the contact key when the engine is in ignition and you will avilitate the fuel and when the veículus turns off, this electrovalvula closes and stops the motor's gear ... already when you have electro injectors you can not because the immobilisator works in the EDC blocking the EDC blocking the injection pulse (in the case of the Rail卡蒙)