Ford Corsar Repair Manual page 264

E.C.C.S. SYSTEM DESCRIPTION
ldle Speed Control
INPUTIOUTPUT SIGNAL LINE
SYSTEM DESCRIPTION
then controls the ONIOFF time of the A.A.C. valve
This system automatically controls engine idle
SO
that engine speed coincides with the target
s ~ e e d to a s ~ e c i f i e d level. ldle speed is con-
value memorized in ROM.
tiolled through fine adjustment of the amount of
air which by-passes the throttle valve via A.A.C.
valve. The A.A.C. valve repeats ONIOFF opera-
tion according to the signal sent from the E.C.U.
The crank angle sensor detects the actual engine
speed and sends a signal to the E.C.U. The E.C.U.
A.A.C. valve
ES- 1 00
E.C.C.S.
control
unit
Engine speed
Crank angle sensor
+
Start signal
b
Idle switch
Neutral switch (M/T)
Inhibitor switch ( A n )
Air conditioner switch
Throttle valve idle position
+
Neutral position
Air conditioner operation
-
b
Power steering operation
b
P Battery voitage
Battery
+
Vehicle speed
Vehicle speed sensor