Summit Wagon FWD L4-1795cc 1.8L SOHC (1994)
Fuel Injector: Description and Operation
Fuel Injector Circuit
PURPOSE
The fuel injectors are solenoid operated valves installed in the intake manifold.
OPERATION
When the solenoid coil is energized the plunger is retracted. The needle valve that is attached to the plunger is pulled to the full open position and
fuel is injected through the valve. When the solenoid is de-energized spring pressure closes the valve. Since the injection nozzle opening is a fixed
size and the fuel pressure is also fixed the injection amount is determined by the duration time which the needle valve is open.
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Battery voltage is applied through the multi- port fuel injection relay to the injector. When the engine control module turns ON the power
transistor in the unit, the solenoid coil is energized to open the injector valve, injecting fuel.
