- Тип техники
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Просмотр инструкции снегоходы Ski Doo MX Z 2005, страница 643
Section 04 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)
The ECM also stores general informations such
as: operating conditions, vehicle hours, serial
numbers, customer and maintenance informa-
tion.
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.
As shown in the SDI CONTROL SYSTEM illustra-
tion, the ECM is the central point of the engine
management system. It reads the inputs, makes
computations, uses pre-determined parameters
and sends the proper signals to the outputs for
proper engine management.
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.
TheRERswitchmayalsobeusedtowake-upthe
Engine Management System.
Waking-up the EMS before doing a start attempt
result in faster start-up.
Waking-up the Engine Management System pow-
ers the ECM, the fuel pump, the ignition coil, the
injectors, and the gauges.
The battery is required to supply current mainly to
the fuel pump to allow a fuel pressure buildup. An
easy way to acknowledge if the Engine Manage-
ment System is woken-up, verify if gauges are lit
up.
The capacitor has two functions. It is used to sta-
bilize battery voltage when voltage from the volt-
age regulator/rectifier is charging the small bat-
tery. It also gives the possibility to be able to start
the engine even if the battery is very low. In this
case, starting the engine may be more difficult and
will require the very complete stroke of the start-
ing rope.
The capacitor relay prevents the capacitor to be
connected to the battery when the engine is not
running to allow safe vehicle maintenance (discon-
nection and reconnection of the capacitor).
Electric Start Models
When the START/RER switch is activated, it
wakes up the EMS and power the starting sys-
tem relay (R1), the ECM, the fuel pump, the
ignition coil, the injectors, and the gauges. Then,
if the cut-off switch and the DESS switch are in
position to allow starting and START/RER switch
is hold, the starter solenoid relay is activated.
All Models
When engine reaches approximately 800 RPM,
the ECM activates the headlights and accessory
relay (R2).
mmr2005-124 121
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