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Barometric Pressure Sensor
This sensor is located inside the ECU and is part of the
ECU unit. Its purpose is to sense atmospheric pressure.
From this information, the ECU determines the correct
fuel/air mixture ratio.
NOTE: This sensor is not replaceable. If it should
fail, the ECU must be replaced.
Fuel Injectors
The fuel injectors are positioned in the top of each
throttle body.
A fuel injector is an electromagnetic injection valve
controlled by a signal from the ECU. The coil used in
the injector is a high-pressure resistance type. The
ECU determines the optimum fuel injection time and
duration based on signals from the five sensors.
When voltage is sent to the fuel injector, it energizes
the coil and opens the needle valve, thereby injecting
fuel. Because the fuel pressure (pressure differential
between fuel line and manifold) is kept constant, the
amount of fuel injected is determined by the duration
of time the valve is open.
The injectors are coded with letters (A-B-C). When
replacement of a fuel injector is necessary, the injector
must be replaced with an injector of the same code let-
ter.
CAUTION
Do not replace an injector with one of a different letter.
Severe engine damage may occur.
Fuel Pressure Regulator
The fuel pressure regulator is located in the fuel pump.
The fuel pressure regulator maintains the fuel pressure
at a constant specified level.
Fuel Pump Circuit
The fuel pump and its circuit are provided with current
from the fuel pump coil on the stator.
For this circuit to function correctly, five components
must be properly functioning. Check the following
components before considering the fuel pump assem-
bly to be defective.
A. Fuel pump coil - test coil.
B. Emergency stop switch and ignition switch
must be ON.
C. Fuel pump - test fuel pump.
D. Wiring harness and connectors - clean the con-
nectors and test the harness.
E. ECU.
SHOCK ABSORBERS
Each shock absorber should be visibly checked daily for
excessive fluid leakage, cracks or breaks in the lower
case, a bent plunger, and wear or leakage in the hoses. If
any one of these conditions is detected, replacement is
necessary. If the operator does not feel qualified to ser-
vice or replace shock absorbers, see an authorized Arc-
tic Cat Snowmobile dealer for this service.
TRACK STUDS
NOTE: The track on this snowmobile is not
equipped with studs. For additional information,
see the 2010 Black and White Reference Catalog
(p/n 5204-070).
The decision to install studs should be made only after
reviewing the International Snowmobile Racing, Inc.
regulations as they pertain to the type of racing you
participate in. Arctic Cat has a variety of studding
products available from your authorized Arctic Cat
Snowmobile dealer.
TOWING
If this snowmobile is to be towed by another snowmo-
bile, do not tow using the loops in the skis. The tow
rope should be attached to the spindles.
Operating Instructions
STARTING AND STOPPING ENGINE
It is imperative that the hydraulic brake system be
checked for wear and proper operation and that all
safety checks found in the accompanying Snowmobile
Safety Handbook be performed before attempting to
IO031A
start the engine. After the engine has been started,
check the headlights (high and low beam), taillight,
and brakelight to be sure they are working properly
and adjusted correctly. Make sure all lights are clean to
provide maximum illumination. The headlight and
taillight must be clean and must be illuminated when-
ever the engine is running.
1. Test the operation of the hydraulic brake system
by compressing the brake lever. The brake lever
must feel firm when compressed; then while hold-
ing the brake lever in the compressed position,
measure the distance between the brake lever and
the handlebar. The distance must be greater than
2.54 cm (1 in.).
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