Individual Efi Components - Arctic Cat Sno Pro 500 Operator's Manual

INDIVIDUAL EFI COMPONENTS

NOTE: With the Arctic Cat EFI System, the ECU
must receive the proper current output from four
coils (two charge coils, an injector coil, and a fuel
pump coil) to function as designed. If a problem
exists, these coils should be checked using the
following procedures.
NOTE: To aid in testing the EFI system, refer to
the EFI Analyzer Usage Manual with EFI Analyzer.
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 read-
ing voltage test should also be made.
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
confirm reading. If still out of tolerance, replace
the stator.
NOTE: If the resistance test is good, a peak read-
ing voltage test should also be made.
Lighting Coil Resistance Test
The lighting coil located on the stator provides AC
power to the lighting system and accessories through
the regulator/rectifier. To test the lighting coil resis-
tance, follow this procedure.
1. Disconnect the 3-wire connector at the engine.
2. Set the meter selector to the OHMS scale.
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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
confirm reading. If still out of tolerance, replace
the stator.
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
repeatedly until KOKUSAN appears on the dis-
play. 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
repeatedly until the words Memory Problem Diag-
nosis Test appears on the display.
Memory Problem Diagnosis Test
6. Press the analyzer TEST button. If all sensors are
good, SENSORS ALL O.K. will appear on the
display. If any of the sensors have intermittently
failed or are faulty, they will appear on the display.
Proceed then to checking the faulty sensor individ-
ually as covered in this section.
NOTE: Once problem areas have been deter-
mined, 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 pro-
ceed to the Memory Problem Diagnosis Test and
push the TEST button. The display should indicate
SENSORS ALL O.K. indicating the memory has
been cleared.
8. Disconnect the analyzer test harness from the ECU
diagnostic connection.
Removing ECU
1. Disconnect the battery; then disconnect the wiring
harness lead from the ECU.
2. Remove the two lock nuts and screws securing the
ECU to the upper spar.
3. Remove the ECU.
Installing ECU
1. Secure the ECU to the upper spar with the screws
and lock nuts.