Ford Corsar Repair Manual page 178

E.C.C.S. DESCRIPTION
Fuel Injection Control
The E.C.M. calculates basic injection pulse width by
processing signals from the hall effect sensor and air
flow meter. Receiving signals from each sensor which
detects various engine conditions, the control unit
adds various enrichments, which are pre-programmed
in the control unit, to the basic injection amount. Thus,
the optimum amount of fuel is injected through the
injectors.
1) Fuel enrichment
In each of the following conditions, fuel is
enriched:
a) When starting.
b) After starting.
c) During warm-up.
d) During acceleration.
e) During heavy load and high engine rpm.
Injector
Distributor (Hall effect sensor)
2)
Fuel shut-off (during deceleration). Fuel shut-off
occurs under certain conditions defined by water
temperature, engine and vehicle speed and
throttle closure.
Additionally fuel shut-off to all cylinders occurs at
6500 rpm to prevent the engine from overrevving.
When this occurs, fuel injection resumes at 6480 rpm.
3) Simultaneous injection.
The fuel is injected into all four cylinders simul-
taneously twice each engine cycle.
Engine speed
t
Simultaneous injection
No.
1
cylinder
Amount of intake air
No. 2 cylinder
No.
3
cylinder
E.C.M.
Air flow meter
Temperature of engine
Water temperature sensor
W
No. 4 cylinder
Throttle position sensor
1
e n g i n e c y c l e
- - - , I
Throttle valve position
t
Throttle valve rate of opening/closing
Density of oxygen in exhaust gas
Exhaust gas sensor
t
Ignition switch
Start signal
W
Battery voltage
Battery
W
Vehicle speed sensor
Vehicle speed