Wiring connector

Wiring connector

The numbers indicate the corresponding control unit pins.

BUTTERFLY CASING ACTUATOR

The actuator is fixed to the inlet chamber and regulates the quantity of air drawn in by the engine.

According to the signal coming from the accelerator pedal potentiometer, the injection control unit control the opening of the butterfly by means of a direct current motor incorporated in the butterfly casing actuator.

The butterfly casing actuator is fitted with two potentiometers connected in parallel so that one controls the other and viceversa.

If there is a problem with the two potentiometers or if there is no supply, the control unit reduces the engine torque, according to the position of the accelerator pedal.

If the butterfly casing actuator or the injection control unit are replaced, the following "self-learning" procedure must be carried out:

• Place the ignition key in the ON position and keep it in this position for 30 secs
• Place the ignition key in the OFF position for 5 secs
• Return the key to the ON position and start up the engine

Wiring connector

The numbers indicate the corresponding control unit pins.