Ford Corsar Repair Manual page 267

E.C.C.S. SYSTEM DESCRIPTION
- 1
Fuel Pressure Regulator Control
INPUT/OUTPUT SIGNAL LlNE
SYSTEM DESCRIPTION
Engine temperature
The fuel "pressure-up" control system briefly
increases fuel pressure for improved starting
performance of a hot engine. Under normal oper-
ating conditions, manifold vacuum is applied to
the fuel pressure regulator. When starting the
engine, however, the E.C.U. allows current to flow
through the ONIOFF solenoid valve in the control
vacuum line, opening this line to the atmosphere.
As a result, atmospheric pressure is applied,
throttling the fuel passage to increase fuel pres-
sure.
above
90°C
(194" F)
START
Ignition
switch
OFF
pA
P.R.
control
solenoid
valve
OFF
i k l
OFF
Approx. 3 min.
SEF741 B
solenoid valve
Engine temperature sensor
r
b
E.C.C.S.
unit
Swirl Control Valve (S.C.V.) Control
INPUTIOUTPUT SIGNAL LlNE
Engine speed
A
SYSTEM DESCRIPTION
condition. This solenoid valve is operated by the
This system has a swirl control valve (S.C.V.) in
E.C.U.
the intake passage of each cylinder,
Water temperature is above 35°C (95°F) with
While idling the S.C.V. closes. Thus the velocity of
stopped and engine running
ldle signal
Idle switch
+
the
ing
SW
i
E.C.C.S.
control
unit
Ignition switch
S.C.V. control
solenoid valve
Start signal
b
Engine speed
Engine temperature
Engine temperature sensor
Vehicle speed sensor
air in the intake passage increases, promot-
the vaporization of the fuel and producing a
Idle switch
Because of this operation, this system tends to
ON
increase the burning speed of the gas mixture,
ES- 1
03
improve fuel consumption, and increase the sta-
Except above
r l in the combustion chamber.
valve
Engine rpm
Below 1,800'1
Below
1,500*2
bility in running conditions.
'1: MIT
' 2 : AIT
Also, except when idling, this system opens the
S.C.V. In this condition, this system tends to
increase power by improving intake efficiency via
reduction of intake flow resistance.
The solenoid valve controls S.C.V.'s shutlopen
OFF
Solenoid
ON
Open
S.C.V.
Close