Section 04 FUEL SYSTEM
Subsection 02 (ELECTRONIC FUEL INJECTION (EFI))
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1. Supercharger
2. Supercharger inlet
3. Supercharger outlet
4. Intercooler
5. Intercooler air inlet — warm air from supercharger
6. Intercooler air outlet — cooled air
7. Throttle body
8. Cooling water outlet — warmed water
9. Intercooler cooling water inlet — cold water
Throttle Body
A 62 mm throttle body is mounted on the intake
manifold. Fitted on the throttle body, an electric
throttle actuator (ETA) allows the ECM to control
the throttle plate opening to regulate the engine
speed.
Air for combustion is drawn at the back of the en-
gine by a mechanically-driven supercharger. The
compressed air flows through the throttle body
and is controlled by a throttle plate. The air con-
tinues through the intake manifold and goes into
the cylinder head.
Intake Manifold
The intake manifold is mounted on the side of the
cylinder block. It provides support for the fuel in-
jectors, the fuel rail, the ECM, the flame arrester
and the throttle body. The intake manifold is a res-
onator between the throttle body and the cylinder
head.
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INTAKE MANIFOLD
1. Engine Control Module (ECM)
2. Fuel rail
3. Injector
4. Throttle body
5. Ignition coil
6. Manifold absolute pressure sensor (MAPS)
7. Manifold air temperature sensor (MATS)
Flame Arrester
The flame arrester is a tube inside the intake mani-
fold. It prevents flames leaving through the intake
system if the engine backfires.
EFI Sensors
The ECM reads the inputs from the sensors,
makes computations, uses pre-determined pa-
rameters and activates the outputs (injectors,
ignition coils etc.).
Signals from sensors are used by the ECM to
determine the injection and ignition parameters
(such as fuel maps required for optimum air-fuel
ratio).
Fuel Rail
One fuel rail is mounted on the intake manifold.
The fuel rail ensures all the time, that enough fuel
can be delivered to the fuel injectors. The fuel rail
is fed by the fuel pump with the properly regulated
fuel pressure.
Fuel Injectors
Three fuel injectors are used to inject fuel into the
intake ports of the cylinder head. One injector is
used per cylinder.
Engine Wiring Harness
The engine wiring harness is connected to the
vehicle harness through the engine connector. It
connects all sensors, injectors and ignition coils.
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1. Engine harness
2. Engine connector
ADJUSTMENT
IDLE SPEED
The idle speed is not adjustable. The ECM con-
trols the idle speed of the engine with the iTC.
If desired, the engine RPM can be measured fol-
lowing this procedure:
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221
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