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Просмотр инструкции снегоходы Ski Doo MX Z 2005, страница 1123
Section 05 ENGINE MANAGEMENT (2-TEC)
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-
est combustion. An ECM (Engine Control Mod-
ule) calculates the proper air/fuel mixture and igni-
tion timing for each cylinder separately. The fuel
is injected into the transfer port of each cylinder.
AIR INDUCTION
Through air filters mounted on dash, air goes into
air silencer. The ECM measures at this point air
pressure and temperature. Then, air for combus-
tion is drawn through two throttle bodies. The air
flow is controlled by two throttle plates. The air
continues through the reed valves into the cylin-
der base then the crankcase.
1
A32C8PA
THROTTLE BODY ASSEMBLY
1. Coolant-heated line
FUEL DELIVERY SYSTEM
GENERAL
When the piston reaches the correct position,
the ECM opens the fuel injectors and fuel is dis-
charged into the transfer ports of cylinders. This
air/fuel mixture is then ignited by the spark plug.
COMPONENT DESCRIPTION
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 level sensor.
A32I18A
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 regu-
lator regulates the fuel pressure at approximately
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 with a fuel pressure of approximately
400 kPa (58 PSI).
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-
formationtotheECM.
Fuel Pickups
The two fuel pickups come with 70 micron filter.
One is located at the front right side of the fuel
tank and the other at the rear left side.
258 mmr2005-028
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