Butterfly Casing Actuator - Fiat 1998 Marea Service Manual

Marea-Marea Weekend
99 range
1 2 3 4 5
F 5 4
6
+30
Copyright by Fiat Auto
m
20v
F57
L F 6 3
F25
Connector wiring
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 en-
gine.
According to the signal coming from the accel-
erator pedal potentiometer, the injection control
unit controls the opening of the butterfly by
means of a direct current motor incorporated in
the butterfly casing actuator.
The butterfly casing actuator has two potenti-
ometers, connected in parallel so that one con-
trols the other and viceversa.
If the two potentiometers fail or if there is no
supply, the control unit reduces the engine
torque depending on the position of the accel-
erator pedal.
The replacement of the butterfly casing actuator
or the injection control unit requires the "self-
learning" procedure described below to be car-
ried out.
- Place the ignition key in the ON position and
keep it there for 30 sees.
- Turn the ignition key to the OFF position for 5
sees.
- Turn the key to the ON position and start up
the engine.
Connector wiring
The numbers indicate the corresponding control
unit pins.
Engine
Fuel system
10.
29