To increase the protection against theft attempts, an electronic
immobiliser system known as the ALFA ROMEO CODE system is adopted.The keys are fitted with an electronic
Transponder device, which sends a coded signal to a special CODE
electronic control unit. If it recognizes the code sent, it allows
the engine to be started up.The code used in the communication, which
takes place via aerial, changes each time the car is started up
(rolling code). The code cannot therefore be reproduced, even with
electronic scanners.The main function of the Code control unit
is to identify the code in the ignition key. The control unit contains
a secret code which is used to communicate with the key Transponder.The control unit contains all enabled key
codes in its memory, together with the code used in the communication
between Code control unit and engine management unit. When the key
is turned to ON for for the first time, if the key is identified
correctly, the code is transferred to the engine management unit and
is then indelibly linked to the Code control unit.
For more details
see DESCRIPTION AND OPERATION: 5580E anti-theft device
.
The Code system has supply lines for the
control unit protected by the maxifuse which also protects the engine
management system and by the fuse which protects other supplies
controlled by the ignition.