Ski-Doo Ski Doo MX Z 2005 [1168/1429] Warning
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Ski-Doo Ski Doo MX Z 2005 [1168/1429] Warning

Ski-Doo Ski Doo MX Z 2005 [1168/1429] Warning
Section 06 ENGINE MANAGEMENT (4-TEC)
Subsection 01 (OVERVIEW)
Electronic Fuel Injection
The ECM reads the signals from different sensors
which indicate engine operating conditions at milli-
second intervals.
Signals from sensors are used by the ECM to de-
termine the injection parameters (fuel maps) re-
quired for optimum air-fuel ratio.
The CPS, the ATS, the MAPS and the TPS are the
primary sensors used to control the injection and
ignition timing. Other sensors (like temperature
sensors, etc.) are used for secondary input.
Ignition System
The ignition system is fully managed by the ECM
which controls the ignition system parameters,
such as spark timing, duration and firing order to
achieve the proper engine requirements.
Ignition Coils
Two separate ignition coils induce voltage to a high
level in the secondary windings to produce a spark
at the spark plug.
The ignition coils receive input from the ECM.
Each coil provides high voltage to its correspond-
ing spark plug.
This ignition system allows spark plugs to spark
independently.
NOTE: Ignition coil wires are not interchangeable
due to different lengths of the wiring harness.
Both ignition coils are located on the cylinder
heads directly on the spark plugs.
1
R1004motr145A
1. Ignition coils
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.There is no mechanical adjustment to per-
form.
Engine Modes of Operation
The ECM controls different operation modes of
the engine to allow proper operation for all possi-
ble conditions: Cranking, start-up, idle, warm up,
part load, full load, engine speed limiter, drowned
engineandlimphome(seebelow).
Flooded Engine (drowned mode)
If engine is fuel-flooded and does not start, this
special mode can be activated to prevent fuel in-
jection and ignition while cranking. Proceed as fol-
lows to activate it.
With tether cord cap on its post while engine is
stopped, press and HOLD throttle lever at WOT
position.
Press the start button. The mode is now on.
Releasing throttle lever will bring back the normal
mode.
If engine does not start, it may be necessary to re-
move spark plugs and crank engine with rags over
spark plug holes. Refer to COMPONENT INSPEC-
TION AND ADJUSTMENT subsection.
WARNING
When disconnecting coil from spark plug, al-
ways disconnect coil from main harness first.
Never check for engine ignition spark from
an open coil and/or spark plug in the engine
compartment as spark may cause fuel vapor
to ignite.
Limp Home Mode
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.
mmr2005-031 303

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