FUEL CUT SYSTEM
As shown in the figure, the fuel cut solenoid valve is provided in the primary slow system of the carbure-
tor to open and close the fuel passage of the slow system.
As turning the ignition switch “OFF” cuts off the electric current to the solenoid, the solenoid closes the
fuel passage. Thus this system contributes to preventing dieseling of the engine after the ignition switch is
turned “OFF”. Also, during the deceleration and provided that all below listed three conditions exist, the
fuel cut solenoid valve operates to cut the fuel feed to the engine temporarily by closing the fuel passage
when it received a signal from the ECM.
Such operation of this system prevents the three-way catalyst from getting heated high and improves fuel
economy.
Three conditions:
l
The coolant temperature is normal.
l
The idle micro switch is in “ON” position. In other words, the primary throttle valve is closed.
l
The engine revolution is more than 2,400 rpm.
.
1. Fuel cut solenoid
2. ignition switch
3.
Fuel passage
4. Idle micro switch
5.
ECM
6. Ignition coil
7.
Thermal switch
valve
-.
.
t/g.
cut system
5-13
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