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Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 02
(OVERVIEW)
07-02-4
SMR2002-077_07-02A.FM
AIR INDUCTION
Air for combustion is drawn directly at the front of
the engine through one 52 mm throttle body. The
air flow is controlled by a throttle plate and an idle
bypass valve respectively. The air continues
through the intake manifold, which contains the
flame arrester and goes into the cylinder head.
52 mm THROTTLE BODY
1. Idle bypass valve
2. Throttle position sensor (TPS)
FUEL DELIVERY SYSTEM
BASIC OPERATION
When the intake valve reaches the correct posi-
tion, the EMS ECU (Electronic Control Unit) opens
the fuel injector and fuel is discharged into the in-
take port at the air intake manifold by the high fuel
pressure inside the fuel rail. The air/fuel mixture
enters then the combustion chamber through the
open intake valve. This mixture is then ignited by
the spark plug.
INTAKE MANIFOLD
INTAKE MANIFOLD
1. Electronic Control Unit (EMS ECU)
2. Fuel rail
3. Injector
4. Throttle body
5. Ignition coil
6. Manifold air pressure sensor (MAPS)
7. Manifold air temperature sensor (MATS)
The intake manifold is mounted on the engine block
on the vehicle starboard side. It provides support
for the fuel injectors, the fuel rail, the EMS ECU, the
flame arrester and the throttle body. The air intake
manifold is a resonator between the throttle body
and the air intake at the cylinder head with the
flame arrester.
Fuel Rail
The fuel rail is a small tube on which the three
injectors are mounted. It ensures all the time, that
enough fuel at the right pressure can be delivered
to the fuel injectors. The fuel rail is fed by the fuel
pump with a fuel pressure of approximately
303 kPa (44 PSI).
Fuel Injector
Three fuel injectors (one per cylinder) are used to
inject fuel into the intake port of the cylinder head.
Flame Arrester
The flame arrester is a tube inside the air intake
manifold. It prevents flames leaving through the
intake system if the engine backfires.
1
2
R1503motr216A
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R1503motr214B
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