Ford Corsar Repair Manual page 256

E.C.C.S. DESCRIPTION
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E.C.C.S. Components
ldle contact p o i n t - ,
m
Full throttle-
contact point
SE F9030
Engine Temperature Sensor
The engine temperature sensor detects the engine tempera-
ture, which is dependent on engine coolant temperature, and
transmits a signal to the E.C.U.
The temperature sensing unit employs a thermistor which is
sensitive to the change in temperature. Electrical resistance of
the thermistor decreases in response to the temperature rise.
Throttle Sensor & SoftIHard ldle Switch
The throttle sensor responds to the accelerator pedal move-
ment. This sensor is a kind of potentiometer which transforms
the throttle valve position into output voltage, and emits the
voltage signal to the E.C.U. In addition, the sensor detects the
opening and closing speed of the throttle valve and feeds the
voltage signal to the E.C.U.
ldle position of the throttle valve is determined by the E.C.U.
receiving the signal from the throttle sensor. This system is
called "soft idle switch" and controls engine operation such as
fuel cut. On the other hand, "hard idle switch", which is built in
the throttle sensor unit, is used not for engine control but for
self-diagnosis.
Not used
(Full throttle
Supply voltage:
5 V (Applied between terminal No. 4 and 6)
6.0 1 1
I
I
l
Output voltage between
4.0
2.0
0
0 45
90 135
Throttle valve opening angle (deg)
. -
Needle valve
S E F 3 5 9 H
Fuel Injector
The fuel injector is a small, elaborate solenoid valve. As the
E.C.U. sends injection signals to the injector, the coil in the
injector pulls the needle valve back and fuel is released into the
intake manifold through the nozzle. The injected fuel is con-
trolled by the E.C.U. in terms of injection pulse duration.
Brass wire is used in the injector coil and thus the resistance is
higher than a conventional injector.