Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 02
(OVERVIEW)
SMR2002-077_07-02A.FM
07-02-3
The complete electrical system is managed by
micro-controllers working together. Overall, the
MPEM (multi-purpose electronic module) manag-
es the vehicle electrical system, the EMS (engine
management system) controls the engine man-
agement and the information center is used to dis-
play information that comes both from MPEM and
EMS.
A communication link is used between the elec-
tronic modules to communicate each other. It con-
sists of a twisted pair of wires (WHITE/RED and
WHITE/BLACK).
For communication link troubleshooting, refer to
INSTRUMENTS AND ACCESSORIES in ELECTRI-
CAL section.
The communication link is also used to communi-
cate informative messages, monitoring and diag-
nostic codes to the information center and to the
VCK (vehicle communication kit) where B.U.D.S.
(Bombardier utility and diagnostic system) is used
for diagnosing and troubleshooting the system.
The fault code can be seen from either the infor-
mation center or B.U.D.S. Refer to DIAGNOSTIC
PROCEDURES section.
MAGNETO SYSTEM AND
POWER SUPPLY
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 380 watts.
It supplies DC current to battery after being trans-
formed by the voltage regulator/rectifier. Refer to
CHARGING SYSTEM.
The battery then supplies all the electrical system
with regulated 12 Vdc.
OPERATING PRINCIPLE OF
ENGINE MANAGEMENT
A highly advanced engine management system
(EMS) has been used to ensure a high power out-
put with cleanest combustion. The EMS calcu-
lates 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 1503, PTO and magneto (MAG) are
on the same engine side (rear). Each cylinder is
referenced as
1
,
2
and
3
instead of PTO, CENTRE
and MAG. The numbers are stamped on the valve
cover.
1. Cylinder 1
2. Cylinder 2
3. Cylinder 3
NOTE:
“EMS” stands for engine management
system. “EMS” includes an ECU (electronic control
unit), sensors, injectors, electromagnetic valves
and ignition system.
1
R1503motr218A
2
3
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