General description

GENERAL DESCRIPTION

The car is fitted with an electronic code system (ALFA ROMEO CODE) which inhibits the control of the engine operated by the ignition keys.

PETROL AND JTD VERSIONS:

Turning the key to the MARCIA position the Engine Control System Control unit (C.C.M.) requests the code from the Control unit of the ALFA ROMEO CODE system - Electronic Key Control Unit (C.C.E.). Once it has received the code, it compares it with the code in its memory (MASTER CODE).

It the comparison of the code received with the one memorised is positive the C.C.M. proceeds with normal electronic engine management (starting, ignition, injection, etc.).

If not, (wrong code, various faults, etc.) the C.C.M. does not carry out engine management and the car will not start.

The C.C.M. offers the possibility to start the car without having received the MASTER CODE by the emergency procedures using the Code Card or the Alfa Tester (see recovery procedures).

The code transmitted to the engine control system control unit (allowing over 4 billion combinations) is computed by an algorithm which makes each transmission between C.C.M. and C.C.E. different from the previous one. (variable, crypt ed code).

TD VERSION:

In the TD version a special Electronic Device integrated in the Engine Stop Solenoid valve (D.E.S.M.) communicates with the C.C.E..

Turning the key to the MARCIA position, the D.E.S.M. device asks the ALFA ROMEO CODE system control unit - Electronic Key Control Unit (C.C.E.) for a code.

Once it has received the code, it compares it with the memorised code (MASTER CODE).

If the comparison of the code recieved with the one memorised is positive, the D.E.S.M. device enables the normal opening of the engine stop solenoid valve.

If not, (wrong code, various faults, etc.) the solenoid valve will not open and the engine will not start.

The C.C.M. offers the possibility to start the car without having received the MASTER CODE by the emergency procedures using the Code Card or the Alfa Tester (see recovery procedures).

If the code has not been recognised correctly, the ALFA ROMEO CODE warning light stays on (in the TD version the injection system warning light is not present).

NOTE: in the following pages the D.E.S.M. device will be called C.C.M., for all the functions which remain unchanged with respect to the injection control unit of a petrol engine.

1. Electronic key
2. Ignition lock
3. "ALFA ROMEO CODE" warning light
4. Injection failure warning light
5. ALFA ROMEO CODE Electronic key control unit
6. Injection control unit (C.C.E.)
7. Code Card
8. Alfa Romeo Tester
9. Engine stop electronic solenoid valve device (D.E.S.M.)

If the code has not been recognised correctly the ALFA ROMEO CODE warning light stays on, together with the injection system failure warning light.