- Тип техники
- Бренд
Просмотр инструкции снегоходы Ski Doo SUMMIT 2005, страница 221
Section 05 ENGINE MANAGEMENT (POWER TEK)
Subsection 01 (OVERVIEW)
POWER DISTRIBUTION
Accessories are protected by fuses. ECM dis-
tributes current to low-power devices.
IMPORTANT: Engine-related sensors and actua-
tors are continuously powered when engine runs.
The ECM switches the ground to complete the
electrical circuits it controls. Take this into ac-
count when troubleshooting the electrical system.
IGNITION SYSTEM
A CDI ignition system is used. The ECM sends
the current to the primary winding of the ignition
coil.
Ignition coil induces voltage to a high level in the
secondary windings to produce a spark at both
spark plugs simultaneously.
Triggercoilsareusedfor:
1) Forward engine rotation.
2) Reverseenginerotation.
3) As a crankshaft position sensor (CPS). This in-
formationissenttotheECM.
The ECM is programmed with data (it contains ig-
nition mappings) for optimum ignition timing un-
der all operating conditions. Using engine operat-
ing conditions provided by the sensors, the ECM
controls the ignition timing for optimum engine op-
eration.
Knock Sensor
A knock sensor is mounted on top of the cylinder
head. It detects specific vibration that would be
typically generated by engine detonation.
When knocking occurs, a fault code is generated.
Refer to DIAGNOSTIC PROCEDURES.
When knocking occurs, the ECM temporarily re-
tards ignition timing and enrichens fuel mixture
until knocking disappears. Then, previous param-
eters automatically resume as required.
Engine RPM Limiter
The ECM will limit the maximum engine speed
(approximately 8600 RPM).
ELECTRONICALLY CONTROLLED
RAVE
The electronically controlled RAVE (e-RAVE) offers
two performance enhancements to conventional
RAVE system.
– The opening of the valve is activated electron-
ically. A solenoid holds the valve closed. The
ECM monitors throttle position and RPM to op-
erates the solenoid in optimal conditions.
– The valve is opened by crankcase pressure.
The greater and more constant pressure from
the crankcase opens the valve more crisply.
NOTE: An electric heating element to the RAVE
valve solenoid ensures proper function in very cold
weather.
Although RAVE valve opening varies according to
engine load and RPM, most of the time in usual
riding the RAVE valves are held closed up to 50%
of throttle opening and 7300 RPM. This gives a
quieter engine, better engine efficiency and fuel
economy.
DIGITALLY ENCODED SECURITY
SYSTEM (DESS)
The following components are specially designed
for this system: ECM, tether cord cap and DESS
post.
This system allows the engine to reach pulley en-
gagement speed only if a programmed tether cord
cap is installed on DESS post. See below for de-
tails.
The DESS circuitry is already activated on replace-
ment ECMs.
The tether cord cap contains a magnet and a ROM
chip. The magnet actually closes the reed switch
inside the post which is the equivalent of a me-
chanical ON/OFF switch. The chip has a unique
digital code.
NOTE: Actually, it is the memory of the ECM
whichisprogrammedtorecognizethedigital
code of the tether cord cap. This is achieved with
the VCK (Vehicle Communication Kit) (P/N 529
035 981). Refer to its operation manual or help
system to program a tether cord cap.
The system is quite flexible. Up to 8 tether cord
caps may be programmed in the memory of the
ECM. They can also be erased individually.
202 mmr2005-105
Ваш отзыв будет первым