Ski-Doo Ski Doo MX Z 2005 [1163/1429] Air induction

Ski-Doo Ski Doo MX Z 2005 [1163/1429] Air induction
Section 06 ENGINE MANAGEMENT (4-TEC)
Subsection 01 (OVERVIEW)
OPERATING PRINCIPLE OF
ENGINE MANAGEMENT
A highly advanced engine management system
(EMS) has been used to ensure a high power out-
put with cleaner combustion. The EMS calculates
the proper air/fuel mixture and ignition timing for
each cylinder separately. The fuel is injected into
the intake port of each cylinder.
NOTE: On the 1004, the cylinders are referenced
as 1 (front) and 2 (rear) instead of PTO and MAG.
2
R1004motr142A
1
1. Cylinder 1
2. Cylinder 2
NOTE: EMS stands for engine management
system. EMS includes an ECM (engine control
module), sensors and injectors.
AIR INDUCTION
Through air filters, air goes into the air silencer.
ECM measures at this point air temperature. Air
pressure is measured directly in the intake man-
ifold. Then, air for combustion is drawn through
one 52 mm throttle body. The air flow is controlled
by a throttle plate and an idle bypass valve respec-
tively. The air continues through the intake mani-
fold and goes into the cylinder head.
1
R1004motr143A
2
52 MM THROTTLE BODY
1. Idle bypass valve
2. Throttle position sensor (TPS)
FUEL DELIVERY SYSTEM
BASIC OPERATION
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 air 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.
298 mmr2005-031

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