Fuel System; Electrical System - Sea-doo 2005 4-Tec models Shop Manual

Section 04 ENGINE MANAGEMENT (1503 4-TEC)
Subsection 01 (OVERVIEW)
Intercooler
The intercooler is a tube which comprises smaller
tubes. Water taken from the outside of the wa-
tercraft is pumped through the smaller tubes and
cools down the intake air. Therefore the air densi-
ty is higher and you get more air into the engine.

FUEL SYSTEM

When the intake valve reaches the correct posi-
tion, the ECM (Engine Control Module) opens the
fuel injector and fuel is discharged into the intake
port at the intake manifold by the high fuel pres-
sure 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.
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.
Fuel Injector
Three fuel injectors (one per cylinder) are used
to inject fuel into the intake ports of the cylinder
head.
Fuel Pump Module
The fuel pump module is located inside the fuel
tank. The module includes the fuel pump, fuel
pressure regulator and fuel level sensor.
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The fuel pump provides fuel pressure and flow
rate to the system.
Fuel Pressure Regulator
A fuel pressure regulator controls the pressure in
the system and allows the excess of fuel to return
to the fuel tank. The fuel pressure regulator reg-
ulates the fuel pressure within 290-310 kPa (42-
45 PSI) for all 4-TEC Naturally-Aspirated, super-
charged engines and at 386-414 kPa (56-60 PSI)
for intercooled engines.
Fuel Filter
A mesh filter is located at the bottom of the fuel
pump module inside the fuel tank.

ELECTRICAL SYSTEM

The complete electrical system is managed by
micro-controllers working together. Overall, the
Multi-Purpose Electronic Module (MPEM) man-
ages the vehicle electrical system, the EMS
(engine management system) controls the en-
gine management and the information center is
used to display information that comes both from
MPEM and EMS.
A communication link is used between the elec-
tronic modules to communicate with each other.
It consists of a twisted pair of wires (WHITE/RED
and WHITE/BLACK).
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