Rotation speed restricter

Rotation speed restricter

This strategy restricts the maximum speed which can be reached by the engine, gradually enabling the cut-off, as illustrated in the table. Maximum speed: 7150 rpm

Electric fuel pump operation

The electric fuel pump is operated by the engine management control unit via a relay.

The pump cuts out:

• if the engine speed goes below 50 rpm;
• after a certain period (around 5 seconds) with the ignition switch in the ON position if the engine is not started up (timed go ahead);
• if the inertia switch is activated.

Operation of injectors

The operation of the injectors is the sequential, phased type. However, during starting, the injectors are operated once, in parallel.

The timing of the injectors can be varied according to the engine speed.

MANAGEMENT OF THE FIAT CODE ANTI-THEFT FUNCTION

The system is fitted with an anti-theft function. This function depends on the presence of a special (FIAT CODE) control unit, capable of dialogue with the engine management 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 engien management control unit.

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

1. the engine management control unit (whose memory contains a secret code) sends the FIAT CODE control unit a request to send the secret code to deactivate the immobilizer function;
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 immobilizing function imposed on the engine management control unit to be deactivated and normal operation resumed.

NOTE The presence of the FIAT CODE anti-theft system means that it is not advisable, during the fault diagnosis, to carry out tests using another engine management control unit. In such a case, the FIAT CODE control unit would transfer the (unrecognized) recognition code to the test control unit which could then no longer be used on any other vehicles.