Arctic Cat Sno Pro 120 2011, Service Manual

Page: 264 / 535

5
5-3
TESTING
Main Wiring And Safety Switches
1. Remove the console; then check the wiring connec-
tions coming from the ignition key and emergency
stop switches. The throttle control switch connector
is located on the front side of the steering post. If any
of the connections appear dirty or corroded, clean
them with contact cleaner and compressed air; then
apply dielectric grease to all non-pin connectors and
connect and squeeze the connections until they are
securely locked.
2. Disconnect the main wiring harness connector com-
ing from the engine stator assembly. Disconnecting
this connector will bypass the main wiring harness
and all switches which will not allow the engine to
be shut off without first installing an additional aux-
iliary ground wire.
3. Insert an auxiliary ground wire into the black wire of
the four-wire main harness connector on the engine
side. To stop the engine once it has been started,
touch the auxiliary ground wire to the engine.
4. Support the rear of the snowmobile up on a shielded
safety stand; then set the brake lever lock. Inspect the
complete throttle mechanism to assure that it's work-
ing properly.
5. Attempt to start the engine. To stop the engine (if the
engine starts), touch the auxiliary ground wire
installed into the four-wire connector to a ground on
the engine. If the engine fails to start, the problem is
with the coils mounted on the engine, high tension
coil assembly, or the ECU. If the engine starts, the
problem is with the switches, main wiring harness, or
throttle cable free-play.
Ignition Key Switch
1. Disconnect the ignition key switch connector; then
connect the ohmmeter leads to each of the ignition
key switch terminals.
2. With the switch in the OFF position, the meter must
read less than 1 ohm of resistance.
3. With the switch in the ON position, the meter must
read OL (infinite resistance).
Throttle Control Switch
1. Disconnect the handlebar harness connector; then
connect one ohmmeter lead to the green/yellow (pin
2) wire and the other lead to the red/violet (pin 3)
wire of the connector.
2. With the throttle lever in the idle position and the
emergency stop knob in the up (RUN) position, the
meter must read no resistance (open). If the meter
reads resistance (closed), replace the switch.
3. With the throttle lever in the idle position and the
emergency stop knob in the down (STOP) position,
the meter must read resistance (closed). If the meter
reads no resistance (open), replace the switch. With
the emergency stop knob still in the down (STOP)
position, move the throttle lever to the wide open
position. The meter must read no resistance (open).
If the meter reads resistance (closed), replace the
switch.
4. Connect one ohmmeter lead to the red/green (pin 8)
wire and the other lead to the red/violet wire (pin 3).
With the emergency stop knob in the down (STOP)
position, the meter must read resistance (closed). If
the meter reads no resistance (open), replace the
switch. With the emergency stop knob in the up
(RUN) position, the meter must read no resistance
(open). If the meter reads resistance (closed), replace
the switch.
Ignition System
(2-Stroke)

NOTE: There must be 0.030-0.060 in. free-play
between the throttle lever and the control housing.
741-518B
TROUBLESHOOTING
1. Remove the spark plugs and visually check their
condition. Replace any fouled plug. Attach the spark
plugs to the high tension leads and ground them to
the engine.

NOTE: At this point, make sure the ignition switch
and the emergency stop switch are in the ON posi-
tion.
CAUTION
Before checking for spark, place all the engine switches
in the deactivated position. In the event the engine
could be flooded, pull the starter rope (slowly at first)
several times to clear the engine of excess fuel.
CAUTION
Never crank the engine over without grounding the
spark plugs. Damage to coils and/or CDI unit/ECU
may result.
Manual
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