Description of system

The Fiat CODE system enables the operation of the engine control unit by means of an exchange of codes.

When the ignition is ON (+15), the engine control unit sends a code request to the Fiat CODE control unit; the latter responds and sends a secret code only after recognizing (via an aerial) a known electronic key entered in the ignition switch.

After recognizing the code, the engine control unit changes over to the engine starting enablement condition.

The engine control unit can only memorize the secret code by means of a particular procedure.

1. CODE warning light on instrument panel
2. Ignition switch with aerial
3. Fiat CODE control unit
4. Key with transponder
5. Engine control unit
   A. Fuel injection/ignition control unit (petrol) or fuel injection pump control unit (diesel)
   B. Electrostop (diesel)
6. CODE Card
7. Fiat/Lancia Tester

DESCRIPTION OF SYSTEM

Engine control unit

The engine control unit is the fundamental component of the Fiat CODE system as it contains the main code (Master Code).

Depending on the model/version, the engine control unit consists of the following devices:

• Electronic fuel injection-ignition control unit for petrol versions with integrated fuel injection/ignition system.
• Electronic fuel injection control unit for diesel versions with electronic pump.
• Electronic device integrated in the electrostop valve for diesel versions with mechanical fuel injection pump.