Can-Am DS 450 2008, Руководство по ремонту

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Section 06 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
Intermittent Ignition Problems
In dealing with intermittent problems there is no
easy diagnosis. Problems that occur only during
normal engine operation may be related to vibra-
tions, or the engine operating temperature, and
have to be tested under similar conditions.
Some intermittent problems may be attributable
to loose, dirty or corroded connections, or water
infiltration, and may be resolved by cleaning the
contacts and applying a dielectric grease for pro-
tection. Always check for these problems before
replacing expensive components and apply the di-
electric grease as specified in the procedures.
Multiple Problems
There is always the possibility of more than one
component being at fault. If, after a component
has been replaced, the problem still persists, care-
fully repeat the testing procedure to find the other
component at fault.
PROCEDURES
Safety Precautions

WARNING
To prevent powerful electric shock while
cranking engine, do not touch any of the ig-
nition components (ignition coil, spark plug
wire, etc.) nor tester leads. Also make sure
that tester leads do not touch any metallic
object.
IGNITION SWITCH
Ignition Switch Operation
The ignition switch is a three position switch,
“OFF”, “ON” with headlights, “ON” without
headlights.
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TYPICAL
1. OFF
2. ON with headlights
3. ON without headlights
The primary function of the ignition switch is to
provide a signal to the ECM of the intent to start
(wake up signal) and run the engine.
The ignition switch receives 12 Vdc directly from
the ECM fuse. When the ignition switch is set
to “ON” (with or without headlights), it sends a
power signal to the ECM through the engine stop
switch (“RUN” position). This wakes up the ECM
which then waits for the “START” switch signal to
engage the starter and control ignition timing for
proper engine operation.
For the ECM to initialize and power the ignition
circuits, it must receive 12 Vdc to pin A4, and it
must not receive a ground at pin K3.
If the engine is running and the ignition switch is
turned to the “OFF” position, the ignition circuit
is opened (contacts C to D), the headlights circuit
is opened (contacts A to F), and a ground is sent
to pin K3 of the ECM through contacts F to E. The
lights will turn off, ignition will cease immediate-
ly and the engine will shut down. However, the
ECM will maintain power on the vehicle for 30 sec-
onds.
Ignition Switch Input Voltage Test
Remove front body assembly, refer to the
BODY
section.
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