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Просмотр инструкции снегоходы Ski Doo SUMMIT 2005, страница 1128
Section 05 ENGINE MANAGEMENT (2-TEC)
Subsection 01 (OVERVIEW)
IGNITION TIMING
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.
ELECTRONICALLY CONTROLLED
RAVE
The electronically controlled RAVE (e-RAVE) offers
two performance enhancements to conventional
RAVE system.
– The opening of the valve is now activated elec-
tronically. A solenoid holds the valve closed.
The ECM monitors altitude, engine tempera-
ture, throttle position and RPM, and operates
thesolenoidinoptimalconditions.
– The valve is now opened by crankcase pres-
sure, as opposed to exhaust pressure. The
greater and more constant pressure from the
crankcase opens the valve more crisply.
NOTE: An electric heating element has been
added to the RAVE solenoid to ensure proper
function in very cold weather.
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. If deto-
nation occurs, the knock sensor detects it and the
ECMs retards the ignition advance and extend the
injection period temporarily (it goes in a specific
mode) until detonation stops.
ENGINE MODES OF OPERATION
The ECM controls different operation modes of
the engine to allow proper operation for all pos-
sible conditions: Cranking, start up, idle, warm
up, normal operation, engine speed limiter, flood-
ed engine and limp home (see below).
FLOODED ENGINE
(DROWNED MODE)
If the engine does not start and it is fuel-flooded,
this special mode can be activated to prevent fuel
injection and ignition while cranking. Proceed as
follows:
With tether cord cap on its post while engine
is stopped, press completely and HOLD throttle
lever.
Press the START/RER button. The mode is now
on.
The engine should be cranked for 20 seconds.
NOTE: No spark occurs on drowned mode.
Release START/RER button and throttle lever. Try
to start the engine normally.
If the engine does not start, it may be necessary
to remove the spark plugs and crank the engine
with rags over spark plug holes. Refer to COM-
PONENT INSPECTION AND ADJUSTMENT.
MONITORING SYSTEM
The ECM monitors the electronic components of
the fuel injection system and some components
of the electrical system.
When a fault occurs, it sends visual messages
through the referring LED and/or audible signals
through a buzzer to inform you of a particular con-
dition. Refer to the DIAGNOSTIC PROCEDURES
section for the referring LED and the buzzer coded
signals chart.
LIMP HOME MODES
Besides the signals as seen above, the ECM may
automatically set default parameters to the engine
management to ensure the adequate operation of
the vehicle if a component of the fuel injection
system is not operating properly.
NOTE: Sensor failures will not lead to a limp home
mode, warning will follow by the check engine
LED and the buzzer.
When minor fault occurs, the fault and mes-
sage/buzzer will disappear automatically, when
the condition disappears.
Depending on the severity of the malfunction, the
vehicle speed may be reduced and not allowed to
reach its usual top speed.
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