Snowmobile Ski Doo REV SERIES (2006 year). Instruction

Section 06 ENGINE MANAGEMENT (SDI)

Subsection 01 (OVERVIEW)

OVERVIEW

A32A1RS

WTS APS

ATS

TPS

CPS

EGTS

BATTERY

ECM

IGNITION

COIL

e-RAVE

MUFFLER

FUEL

TANK

ELECTRIC

FUEL PUMP

SEMI-DIRECT INJECTION SYSTEM OVERVIEW

LEGEND

APS

ATS

CPS

ECM

EGTS

TPS

CTS

Air pressure sensor

Air temperature sensor

Crankshaft position sensor

Engine control module

Exhaust gas temperature sensor

Fuel injector

Fuel rail

Knock sensor

RAVE solenoid

Throttle position sensor

Coolant temperature sensor

OUT

TYPICAL

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Section 06 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)

OPERATING PRINCIPLE

For this SDI 2-stroke engine, a highly advanced en-
gine management system (EMS) has been used to
ensure a high power output combined with clean-
er combustion. An ECM (Engine Control Module)
calculates the proper air/fuel mixture and ignition
timing for each cylinder separately. The fuel is in-
jected into the transfer port of each cylinder.

CHARGING SYSTEM

The magneto is the primary source of electrical
energy. It transforms magnetic field into electric
current (AC).

The magneto has a 3 phases, delta wound stator
on 18 poles. Capacity is 480 watts.

AC current is rectified and regulated between 13.4
and 15 volts for the vehicle electrical system. It
supplies the ECM with DC current.

Vehicle 12-volt battery supplies the ECM with DC
current.

IGNITION SYSTEM

Double ignition coil has two separate windings,
one for each spark plug.

Ignition coil induces voltage to a high level in the
secondary windings to produce a spark at the
spark plug.

Two separate windings circuits are switched to
ground through the ECM. Each winding provides
high voltage to its corresponding spark plug.

This ignition system allows spark plugs to spark
independently.

CAUTION: Do not interchange spark plug ca-
bles. Match reference (PTO or MAG printed
on high tension cable yellow tag) with corre-
sponding cylinder spark plug.

Double ignition coil is located underneath air si-
lencer.

A33I0AA

TYPICAL
1. PTO side high tension cable
2. MAG side high tension cable

AIR INDUCTION

Through air filter mounted LH side panel, air goes
into air silencer. The ECM measures at this point
air pressure and temperature. Then, air for com-
bustion is drawn through two throttle bodies. The
air flow is controlled by two throttle plates. The air
continues through the reed valves into the cylinder
base then the crankcase.

A32C8PA

THROTTLE BODY ASSEMBLY
1. Coolant-heated line

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Section 06 ENGINE MANAGEMENT (SDI)

Subsection 01 (OVERVIEW)

FUEL DELIVERY SYSTEM

Diaphragm Fuel Pump

A conventional diaphragm fuel pump is used to
supply fuel to the electric fuel pump reservoir lo-
cated inside fuel tank. This reservoir is the fuel
supply for the electric fuel pump. This system
allows a more consistent fuel delivery under ex-
treme riding angles and when the fuel tank level
is low, which increases the fuel range per tank.

NOTE: A bypass hole in the upper section of the
pump reservoir allows fuel to enter or exit the
reservoir depending of the conditions.

A33C5OA

1. Diaphragm pump
2. Fuel pick-up
3. Pump reservoir
4. Electric fuel pump

Electric Fuel Pump and Fuel
Pressure Regulator

They provide fuel pressure and flow rate to the
system.

The fuel pump module is located inside the fuel
tank. The module includes the fuel pump and the
fuel pressure regulator. The fuel pump inlet in-
cludes a filter.

A33C5PA

The 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
regulates the fuel pressure at 400 kPa (58 PSI).

Fuel Rail

The fuel rail is a small tube on which the four in-
jectors are mounted. It ensures at all times that
enough fuel at the right pressure can be delivered
to the fuel injectors. The fuel rail is fed by the fuel
pump module.

Fuel Injectors

Fuel injectors (two per cylinder) are used to inject
fuel into the transfer port of cylinder.

Throttle Body

It is a dual throttle body mounted on the engine in-
take side. Fitted on this dual throttle body, there
is a TPS (Throttle Position Sensor) that sends in-
formation to the ECM.

In-Line Fuel Filter

The in-line 10 micron fuel filter is fastened under
the steering console. It should be replaced annu-
ally.

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Section 06 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)

A33I08A

ENGINE MANAGEMENT
SYSTEM (EMS)

The EMS

(Engine Management System)

equipped with an ECM which controls the ig-
nition system, the vehicle electrical system, the
fuel injection system and the electronically con-
trolled RAVE.

A32E3AA

TYPICAL — ECM

The ECM is mounted in the front of the vehicle.

A33I09A

The ECM is directly powered by the battery. It
is responsible for the following engine manage-
ment/electrical functions:

– interpreting information
– distributing information
– start/stop function
– DESS (Digitally Encoded Security System)
– ignition control
– injection control

NOTE: The ECM applies the proper maps (injec-
tion and ignition) for optimum engine operation in
all conditions.

– engine RPM limiter
– RER (Rotax Electronic Reverse)
– etc.

The ECM features a permanent memory that will
keep the programmed tether cord cap(s) code,
fault codes and other vehicle information, even
when the battery is removed from the vehicle.

Manual Start Models

While cranking, the magneto sends AC current to
the voltage regulator/rectifier that in turn, sends a
signal to the ECM. This wakes up the Engine Man-
agement System and activate the starting system
relay (R1) and the capacitor relay (R4). Just a small
rotation of the engine is needed to wake-up the
ECM.

The RER switch may also be used to wake-up the
Engine Management System.

Waking-up the EMS before doing a start attempt
result in faster start-up.

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Snowmobile Ski Doo REV SERIES (2006 year). Instruction - part 59