Arctic Cat Sno Pro 120 2011, Service Manual

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4-18
Injector Coil Resistance Test
The injector coil located on the stator powers the two
injectors.
1. Disconnect the double-wire plug with two blue/white
leads from the stator to the ECU.
2. Set the meter selector to the OHMS scale.
3. Connect a meter lead to each of the blue/white leads.
The meter must show 15.2-22.8 ohms.

NOTE: If reading is not within the specification,
recheck to confirm test results. If still out of toler-
ance, replace the stator.

NOTE: If the resistance test is good, a peak reading
voltage test should also be made. Refer to Peak Volt-
age Output Tests in Section 5.
Fuel Pump Coil Resistance Test
The fuel pump coil powers the fuel pump through the
ECU.

NOTE: With the engine running, there should 12.3-
12.9 DC volts supplied to the fuel pump for operation.
To test fuel pump coil resistance, use the following
procedure.
1. Disconnect the double-plug with the two orange
wires from the ECU.
2. Set the meter selector to the OHMS scale. Connect a
meter lead to each of the two orange leads.
3. The meter must show 1.52-2.28 ohms.

NOTE: If reading is out of tolerance, recheck to con-
firm reading. If still out of tolerance, replace the sta-
tor.

NOTE: If the resistance test is good, a peak reading
voltage test should also be made. Refer to Peak Volt-
age Tests in Section 5.
Lighting Coil Resistance Test
The lighting coil located on the stator provides AC power
to the lighting system and accessories through the chassis
control unit (500/600 cc) or regulator/rectifier (800/1000
cc). To test the lighting coil resistance, follow this proce-
dure.
1. Disconnect the 3-wire connector at the engine.
2. Set the meter selector to the OHMS scale.
3. Test between the two yellow leads.
4. The meter must show 0.08-0.12 ohm.

NOTE: If reading is out of tolerance, recheck to con-
firm reading. If still out of tolerance, replace the sta-
tor.
ACTIVATING ECU MEMORY
1. Connect the analyzer test harness to the ECU diag-
nostic connector.
2. Connect the analyzer test harness red and black leads
to a 12-volt battery.
3. Turn the analyzer switch ON.
4. Press the analyzer MENU SELECT buttons repeat-
edly until KOKUSAN appears on the display. Once
the word KOKUSAN appears on the display, press
the TEST button. The analyzer is now set up to test
the EFI system.
5. Press the analyzer MENU SELECT buttons repeat-
edly until the words Memory Problem Diagnosis
Test appears on the display.
6. Press the analyzer TEST button. If all sensors are
good, SENSORS ALL O.K. will appear on the dis-
play. If any of the sensors have intermittently failed
or are faulty, they will appear on the display. Proceed
then to checking the faulty sensor individually as
covered in this section.

NOTE: Once problem areas have been determined,
always check the component(s) for clean and tight
connections.
7. To erase the memory of the ECU, press the TEST
button once again; then push the MENU SELECT
buttons until Diagnosis Memory Clear appears on
the display. Turn the analyzer OFF and then back ON
again. Reselect KOKUSAN mode; then proceed to
the Memory Problem Diagnosis Test and push the
TEST button. The display should indicate SEN-
SORS ALL O.K. indicating the memory has been
cleared.
REMOVING ECU
1. Disconnect the wiring harness lead from the ECU.
2. Remove the two screws securing the ECU to the air
silencer (CFR/Crossfire/M-Series) or to the left-front
upper frame (F-Series/T-Series/Z1).
3. Remove the ECU.
INSTALLING ECU
1. Secure the ECU to the air silencer (CFR/Crossfire/
M-Series) or to the left-front upper frame (F-Series/
T-Series/Z1) with the screws.

NOTE: On the CFR/Crossfire/M-Series, make sure
the diagnostic connector plug faces the oil reservoir.
2. Connect the wiring harness to the ECU.

NOTE: Make sure all connectors are clean and tight.
Apply dielectric grease to all connectors.
Testing Individual
Components

NOTE: For the following tests, use the Fluke Model
77 Multimeter or a multimeter of the same quality.
Memory Problem Diagnosis Test
Manual
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