Suzuki GA413, Service Manual

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The main components of the air intake system are air
cleaner, air cleaner outlet hose, throttle body, idle air
control valve and intake manifold.
The air (by the amount corresponding to the throttle
valve opening and engine speed) is filtered by the air
cleaner, passes through the throttle body, is distrib- uted by the intake manifold and finally drawn into each
combustion chamber.
When the idle air control valve is opened according to
the signal from ECM, the air bypasses the throttle
valve through bypass passage and is finally drawn into
the intake manifold.
AIR INTAKE SYSTEM
1. Air cleaner
2. IAT sensor
3. Throttle body
4. IAC valve
5. MAP sensor
6. Intake manifold
7. EVAP purge valve
8. Union (fuel pressure regulator)
9. Breather hose
10. PCV hose
11. PCV valve
12. EGR valve (if equipped)
FUEL DELIVERY SYSTEM
The fuel delivery system consists of the fuel tank, fuel
pump, fuel filter, fuel pressure regulator, delivery pipe
and fuel injectors.
The fuel in the fuel tank is pumped up by the fuel pump,
filtered by the fuel filter and fed under pressure to each
injector through the delivery pipe.
As the fuel pressure applied to the injector (the fuel
pressure in the fuel feed line) is always kept a certain amount higher than the pressure in the intake manifold
by the fuel pressure regulator, the fuel is injected into
the intake port of the cylinder head when the injector
opens according to the injection signal from ECM.
The fuel relieved by the fuel pressure regulator returns
through the fuel return line to the fuel tank.
1. Fuel feed line
2. Fuel return line
3. Fuel delivery pipe
4. Fuel injector
5. Fuel pressure regulator
6E-6 ENGINE AND EMISSION CONTROL SYSTEM