Arctic Cat M 8000, Service Manual

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Fuel Systems
This section has been organized for servicing the fuel
systems; however, some components may vary from
model to model. The technician should use discretion and
sound judgment when removing/disassembling and
assembling/installing components.
Whenever any maintenance or inspection is made on the
fuel system where fuel leakage may occur, there should
be no welding, smoking, or open flames in the area.
 NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is nec-
essary.
SPECIAL TOOLS
A number of special tools must be available to the techni-
cian when servicing the fuel systems.

NOTE: Special tools are available from the Arctic
Cat Service Parts Department.
EFI System
INTRODUCTION
The Arctic Cat EFI System operates off a series of coils
located on the stator and is made up of the following
components.
1. An engine control module (ECM) calculates input
from sensors (exhaust temperature sensor, air tem-
perature sensor, coolant temperature sensor, throttle
position sensor, ignition timing sensor, barometric
pressure sensor, and a knock sensor) to provide the
engine with the correct fuel mixture and timing for
optimum operation.
2. Charge coils (1 and 2), located on the stator, provide
AC voltage to the ECM/regulator/rectifier where AC
voltage is converted to DC voltage.
3. A fuel pump coil located on the stator operates the
low voltage, high output fuel pump. At cranking
speed, the high output fuel pump provides enough
fuel to charge the fuel rail.
4. An injector coil located on the stator provides the
injectors with DC voltage for operation through the
ECM.
5. A lighting coil located on the stator plate provides
output to the regulator/rectifier (8000) to operate
accessories and the lighting system.
FLOODED ENGINE
If the engine should become flooded, set the brake lever
lock, compress the throttle lever to the full-open position,
and crank the engine over until it starts and clears itself.
Release the brake lever lock.
FUEL SYSTEM
The fuel is first drawn into the electric fuel pump through
multiple pick-up valves and hoses. The fuel is then
routed through a high-pressure fuel hose to the fuel rail.
The fuel pressure is maintained in the fuel rail by the fuel
regulator. With the fuel pressure maintained at a constant
psi, the ECM evaluates the information it receives from
the electrical sensors and opens the injectors for precise
periods of time (pulse widths) to meet engine demands.

NOTE: The entire EFI system depends on all coils
functioning properly on the stator.
Individual Components
ECM
The ECM is the brain of the EFI system. It uses sensor
inputs to determine the correct fuel/air ratio for the
engine given the existing conditions of altitude and tem-
perature.
If any of the sensors should fail while the engine is run-
ning, the ECM will sense a problem and go into a “fail
safe” mode. This is an over-rich condition and will
greatly reduce performance. However, the engine will be
protected from a possible lean condition and engine dam-
age.
The ECM is equipped with a self-diagnostic system uti-
lizing the service icon in the speedometer/tachometer and
remains illuminated when a problem exists with any of
the sensors. The technician can determine the problem
sensor by reading the code shown on the readout screen
and applying it to the ECM Diagnostic Codes chart (see
Self-Diagnostic System/Codes in this section).
 NOTE: The ECM cannot be repaired.
If the ECM is not receiving current from one of the out-
put coils on the stator, that circuit will not operate. Coils
on the stator are the charge coils operating the ECM, the
injector coil which operates the injectors, the fuel pump
coil which operates the fuel pump, and the lighting
coil/chassis control unit operating all accessories and the
lighting system.
 NOTE: On the 4000, the ECM is coded with a letter
(A-B-C). When replacement of the ECM is necessary,
the ECM must be replaced with an ECM of the same
letter.
Description p/n
CATT II 0554-023
EFI Analyzer 0744-049
EFI Diagnostic System Manual 2257-850
EFI Diagnostic System Manual (Instructions) 2259-020
Fluke Model 77 Multimeter 0644-559
Fuel Hose Clamp Tool 0644-545
EFI Fuel Pressure Test Kit 0644-587
Vacuum Test Pump 0644-131
Fuel Pump Installation Tool Kit 0744-074
Laptop Diagnostic Test Kit 0744-050
Laptop Diagnostic Tool 0744-060
Oil Injection Usage Tool 0644-007