Arctic Cat XC 450 2016, Service Manual

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Inspecting
1. Inspect the fuel screen and blow clean with low pres-
sure compressed air.
2. Move the float lever and check for free movement.
The float assembly should return to the lower posi-
tion without force. If not, replace the fuel pump
assembly.
3. Test the fuel level sensor by connecting a multimeter
(A) to the fuel level sensor leads (B); then select
OHMS. The multimeter should show 5 ohms at full
fuel position (C) and 95 ohms at empty fuel position
(D).
ATV2116

NOTE: If readings are erratic, clean the resistor
wiper and resistor with clean alcohol and retest. If
still not correct, replace the fuel pump assembly.
Installing
1. Mark the new fuel pump with a reference mark in the
same location as the removed pump; then place the
new gasket on the pump.
2. Remove the material covering the fuel pump open-
ing; then carefully guide the fuel pump into position
taking care not to damage the float or float lever.
KX190
3. Rotate the fuel pump until the match marks align;
then install the mounting screws and tighten securely
using a crisscross pattern.

NOTE: It is important to install the fuel pump with
the correct orientation to ensure adequate float lever
clearance.
4. Connect the wires and gasline hose; then connect the
negative battery cable and turn the ignition switch to
the ON position. Note that the fuel pump runs
momentarily and the fuel gauge indicates the proper
fuel level.
5. With the transmission in neutral and brake lever lock
engaged, start the engine and check for normal oper-
ation. Check for any fuel leaks.
6. Install the side panels and gas tank cover.
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR

NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see EFI Diagnostic System in this section)
1. Connect the meter leads (selector in OHMS position)
to the sensor terminals.
2. Suspend the sensor and a thermometer in a container
of cooking oil; then heat the oil.

NOTE: Neither the sensor nor the thermometer
should be allowed to touch the bottom of the con-
tainer or inaccurate readings will occur. Use wire
holders to suspend the sensor and thermometer.
3. If the readings are not as indicated, the sensor must
be replaced.
4. Install the sensor and tighten securely.
5. Connect the leads.
SPEED SENSOR
 NOTE: Preliminary checks may be performed on
this component using the diagnostic mode on the LCD
gauge (see EFI Diagnostic System in this section)
1. Set the meter selector to the DC Voltage position.
2. With appropriate needle adapters on the meter leads,
connect the red tester lead to the orange wire; then
connect the black tester lead to the ground wire.
3. Turn the ignition switch to the ON position.
4. The meter must show battery voltage.
5. Leave the black tester lead connected; then connect
the red tester lead to the pink/white wire.

AT THIS POINT
If the pump has failed earlier test and must be replaced,
proceed to INSTALLING.
Component data can be retrieved using the CATT II. Uti-
lize the Sensor Data screen.
! WARNING
Wear insulated gloves and safety glasses. Heated oil
can cause severe burns.
TEMPERATURE RESISTANCE
20° C (68° F) 2.45k Ohms
50° C (122° F) 800 Ohms
80° C (176° F) 318 Ohms
110° C (230° F) 142 Ohms