Rotation speed limiter

Rotation speed limiter

The strategy restricts the maximum speed which can be reached by the engine enabling the cut-off gradually, as shown in the table. Maximum speed: 6550 rpm

Electric fuel pump operation

The electric fuel pump is operated by the engine control unit via a relay.
The pump cut out takes place:

• if the engine speed goes below 50 rpm;
• after a certain time (about 5 seconds) with the ignition switch in the ON position without the engine being started up (timed inhibitor);
• if the inertia switch has intervened.

Injector operation

The operation of the injectors is the sequential timed type. However, during starting the injectors are operated once in parallel.
The timing of the operation of the injectors is variable according to the engine speed.

FIAT CODE ANTI-THEFT SYSTEM MANAGEMENT

The system is equipped with an anti-theft function. This function is achieved thanks to the presence of a special control unit (FIAT CODE), capable of dialogue with the engine control unit and an electronic key, equipped with a special transmitter for sending a recognition code.
Each time the key is turned to the OFF position, the Fiat CODE system completely deactivates the engine control unit.

If the key is turned to the ON position, the following operations take place in the order given:

1. the engine control unit (whose memory contains a secret code) sends the FIAT CODE memory a request so that the latter sends the secret code to deactivate the locking of the functions;
2. the Fiat CODE control unit responds by only sending the secret code after having, in turn, received the recognition code transmitted by the ignition key;
3. the recognition of the secret code allows the de-activation of the locking of the engine control unit and its normal operation.

NOTE The presence of the FIAT CODE anti-theft system makes it strongly inadvisable, during diagnosis, to proceed with the test using another engine control unit. In effect, in such a case, the Fiat CODE control unit would transfer the (unrecognized) recognition code to the test control unit which would then make it unusable on other vehicles.