Section 05 ELECTRICAL
Subsection 02 (OVERVIEW)
05-02-3
Magneto Flywheel/Trigger Coil
The magneto flywheel features six protrusions
that are working with the trigger coil. The trigger
coil sends the signals to the MPEM to be pro-
cessed for the ignition system. The MPEM also
uses these signals to accurately calculate the en-
gine RPM and among other things, control the
maximum engine RPM.
Ignition Coil/Spark Plugs
The ignition coil receives its signal from the
MPEM. The ignition coil steps up the input voltage
for the IDI system and the end result is firing of
the spark plugs. It is a double coil that provides a
separate spark to each spark plug. The double con-
trol circuit in the MPEM works separately on each
part of the ignition coil so, one ignition coil still
could work while the other might be defective.
ELECTRIC SHIFT SYSTEM
An electronically controlled hydraulic shift system
is utilized. It is made up of the following compo-
nents:
1. Battery
2. Ignition switch
3. Upshift/downshift switch
4. Sensor
5. MPEM
6. Solenoid/valve
Battery/Ignition Switch
The ignition switch allows battery to supply the
MPEM. The MPEM then supplies the solenoids
for the shifting system.
Upshift/Downshift Switch
When the upshift or downshift button is pressed,
the MPEM activates the proper solenoid (up or
down) that moves the shared hydraulic valve.
Sensor
Many sensors are used to assist the MPEM to ac-
quire the conditions where the vehicle is operated
to allow the MPEM to compute and select the
proper parameters accordingly.
The VSS (vehicle speed sensor) supplies the
MPEM with the vehicle speed.
The GBPS (gearbox position sensor) supplies the
MPEM with the gear position (1, 2, 3, 4, 5).
The STPS (sub-transmission sensor) supplies the
MPEM with the sub-transmission position (P, R, N,
H, L).
The brake light switch is also used by the MPEM
to allow engine starting in other position than
PARK and NEUTRAL.
Other sensors are utilized but they are not related
to the shifting system.
MPEM
The MPEM is responsible to properly engage/
disengage/modulate the clutch and to shift gears.
Although the shift system is performed by hy-
draulic valves on mechanical components, it is
electronically-controlled through the MPEM.
The MPEM uses pre-defined parameters to change
engine RPM, modify the engine timing curve, con-
trol the shift timing and modulation depending on
the sensors reading to accomplish an accurate
shifting adapted to each specific condition.
Solenoid/Valve
The solenoids/valves combo are the electro-hydraulic
devices that actually activate the mechanical oper-
ations. Besides the shifting valve (upshift/downshift),
there is a clutching valve that pushes an actuator
to open and close the clutch and at last, a clutch
modulator valve that regulates the oil pressure to
control the speed at which the clutch is opened
and released (modulation). The hydraulic system
is enclosed in the engine/transmission case and
the same oil as the engine is used for the hydraulic
valves.
GAUGES/ACCESSORIES
The battery supplies the DC current to all accesso-
ries. Some are fed directly by the battery or through
the fuse block and some are fed through the MPEM.
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