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GTX Limited iS 2009
Инструкция по эксплуатации Страница: 244

Sea-Doo GTX Limited iS 2009 Инструкция по эксплуатации онлайн [244/555] 12053

Section 04 FUEL SYSTEM

Subsection 02 (ELECTRONIC FUEL INJECTION (EFI))

smr2009-030-019_a

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. Engin

e Control Module (ECM)

2. Fuel rail

3. Injector

4. Thro

ttle body

5. Ignition coil

6. Manifold absolute pressure sensor (MAPS)

7. Mani

fold 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 idl

e speed is not adjustable. The ECM con-

trols t

he idle speed of the engine with the iTC.

If desired, the engine RPM can be measured fol-

lowing this procedure:

smr2009-030 221

Sea-Doo GTX Limited iS 2009 Инструкция по эксплуатации онлайн [244/555] 12053

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