E7010 Code

Description

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.

Description of operation

The CODE control unit M20 is supplied at pin 3 by the battery from the line for the maxifuse EFI of B5 to 2/99 or B99 from 2/99, through the line protected by fuse B35 to 2/99 or by fuse F5 of supplementary fuse box B98A from 2/99.

The supply controlled by the ignition (15/54) reaches pin 8 from the line protected by shunt fuse B25 to 2/99 or fuse F4 of the additional fuse box B98A from 2/99.

Pin 4 is earthed.

The line leading from pin 6 is a serial line leading to engine management unit M10, which is responsible for identifying the key and exchanging codes.

The control unit is equipped with a self-diagnostic unit that may be used by connecting the unit to connector R10: this receives signals from pin 5 of control unit M20 through the tester line.

The self-test system also produces the signal for the "CODE failure" warning light, located in the check instrument E30, which comes out of pin 2 of the control unit M20.

The check module E30 receives a supply controlled by the ignition (INT) at pin 1 from the line protected by fuse B11 to 2/99 or from fuse F4 of supplementary fuse box B98B from 2/99: when this earth signal arrives, the "CODE failure" warning light comes on.

A second control unit connector is connected via two leads to the aerial, fitted coaxially to the ignition key, in order to detect key insertion and rotation.

Wiring diagram

Components

Component location