Fiat Bravo Service Manual page 380

Bravo
b
20v
Recovery
If the actuator fails, the control unit activates different recovery strategies depending on the butterfly
valve opening angle.
Recovery 1: valve in recovery position, near the idle air flow rate for:
- short circuit battery V at opening or closing winding or opening and closing winding;
- open circuit at opening or closing winding or at opening and closing winding
- short circuit battery V at opening winding and open circuit at opening winding
- short circuit battery V at closing winding and open circuit at opening winding.
Recovery 2: valve open 0% for:
- short circuit battery V at opening winding and short circuit to earth at closing winding;
- open circuit at opening winding and short circuit to earth at closing winding.
Recovery 3: valve open 50% for:
- short circuit to earth at opening winding or closing winding or opening and closing
Recovery 4: valve open 100% for:
- short circuit battery V at closing winding and short circuit to earth at opening winding;
- open circuit at closing widing and short circuit to earth at opening winding.
Additional provisions
Locking the idle self-adjustment at the current values and locking the idle control.
Copyright by Fiat Auto
E N G I N E I D L E
S P E E D
(0.280.140.553)
It is composed of an electric motor which, by
opening the flow of supplementary air (in par-
allel to the flow from the butterfly with the ac-
celerator released) in the butterfly casing more
or less, automatically keeps the engine idle
speed constant, irrespective of the load condi-
tions (additional consumers switched on or
not, engine hot or cold, etc.).
The opening caused by the rotation of the dis-
tributor is controlled by electrical' impulses
processed by a special section in the injection
control unit which causes the distributor to ro-
tate in one direction or the other depending on
the speed at which the engine is rotating.
Wiring connector
N O T E The numbers indicate
sponding control unit pins.
E n g i n e
Fuel system
10.
A C T U A T O R
the corre-
2 9