Ski-Doo Ski Doo MX Z 2005 [254/1429] Electronically controlled rave
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Ski-Doo Ski Doo MX Z 2005 [254/1429] Electronically controlled rave

Ski-Doo Ski Doo MX Z 2005 [254/1429] Electronically controlled rave
Section 06 ENGINE MANAGEMENT (SDI)
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 activated electron-
ically. A solenoid holds the valve closed. The
ECM monitors altitude, engine temperature,
throttle position and RPM, and operates 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 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 to cut ignition while cranking. Pro-
ceed as follows:
With tether cord cap on its post while engine
is stopped, press completely and HOLD throttle
lever.
Manual Start Models
Crank engine several times.
Electric Start Models
Press the START/RER button.
The engine should be cranked for 20 seconds. Re-
lease start/RER button.
All Models
In the engine drowned mode, engine cannot
start. It is required to release throttle lever and to
start/crank engine again to allow starting.
NOTE: Iftheenginedoesnotstart,itmaybenec-
essary to replace the spark plugs.
MONITORING SYSTEM
The ECM monitors the electronic components of
the engine management system and other com-
ponents of the electrical system.
When a fault occurs, it sends a signal to the check
engine LED or also to the beeper to inform the
driver of a particular condition. Refer to the DIAG-
NOSTIC PROCEDURES.
LIMP HOME MODES
Besides the signals as seen above, the ECM may
automatically set default parameters to ensure the
adequate operation of the vehicle if a component
of the engine management system is not operat-
ing properly.
NOTE: Sensor failures will not lead automatically
to a limp home mode. The check engine LED will
turn on and in some cases the beeper.
The engine RPM may be limited if some critical
components fail. In this case, releasing throttle
and letting the engine returning to idle speed may
allow normal operation to come back. If it does
not work, try removing and reinstalling the tether
cord cap on DESS post.
These performance-reduced modes allow the rid-
er to go back home which would not be possible
without this advanced system. Refer to the DIAG-
NOSTIC PROCEDURES for a complete chart.
238 mmr2005-079

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