Electronic Fuel Injection - Arctic Cat 450 Service Manual

Fuel/Lubrication/Cooling
 NOTE: Arctic Cat recommends the use of new gas-
kets, lock nuts, and seals and lubricating all internal
components when servicing the engine/transmission.
 NOTE: Some photographs and illustrations used in
this section are used for clarity purposes only and
are not designed to depict actual conditions.
 NOTE: Critical torque specifications are located in
Section 1.
SPECIAL TOOLS
A number of special tools must be available to the techni-
cian when performing service procedures in this section.
Refer to the current Special Tools Catalog for the appro-
priate tool description.
Description
Oil Pressure Test Kit
Seal Removal Tool
Tachometer
 NOTE: Special tools are available from the Arctic
Cat Service Department.

Electronic Fuel Injection

! WARNING
Whenever any maintenance or inspection is performed
on the fuel system during which there may be fuel leak-
age, there should be no welding, smoking, open flames,
etc., in the area.
TROUBLESHOOTING
1. Verify that the electric fuel pump is operating by lis-
tening for a "whirring" sound for several seconds
after the ignition switch is turned to the ON position.
If no sound can be heard, see Electric Fuel
Pump/Fuel Level Sensor in this section.
2. Check for a flashing DTC (Diagnostic Trouble
Code) on the LCD. If a code is flashing, see appro-
priate Diagnostic Trouble Codes (DTC) in Section 5.
3. Make sure there is sufficient, clean gas in the gas
tank.
4. Verify that the battery is sufficiently charged to crank
the engine over at normal speed.
5. Check the air filter housing and air filter for contami-
nation. Clean or replace as necessary (see Section 2).
4-2
p/n
0644-495
0644-072
0644-275
Manual
Table of Contents
REMOVING (450)
1. Turn the ignition switch to the OFF position; then
remove the ignition switch key.
! WARNING
Do not turn the ignition switch to the ON position with
the hoses removed. Gasoline will be pumped by the
electric fuel pump causing a safety hazard.
2. Remove the seat; then disconnect the battery.
3. Remove the storage compartment cover and air filter
housing cover; then remove the air filter.
4. Loosen the clamp securing the air filter housing boot
to the throttle body inlet; then remove the boot from
the throttle body.
5. Slowly disconnect the gasline hose connector from
the fuel rail.
! WARNING
Gasoline may be under pressure. Place an absorbent
towel under the connector to absorb any gasoline spray
when disconnecting.
6. Remove the screw securing the throttle actuator
cover to the throttle body; then remove the cover.
7. Remove the throttle cable from the actuator arm.
8. Loosen the outer jam nut securing the throttle cable to
the throttle body; then route the cable out of the way.
9. Remove the MAP sensor (A), fuel injector connector
(B), ISC connector (C), and TPS connector (D).
Section
Table of Contents
FI092A
HDX136A