5-14
HIGH POWER
1. Connect the red maxiclip and meter lead to the red/
black lead; then connect the black maxiclip and
meter lead to the black lead.
2. Pull the recoil starter rope briskly.
3. Meter reading must be within specification.
NOTE: Repeat this test three times to confirm
results.
Servomotor/
Potentiometer Test
SERVOMOTOR
NOTE: A 12-volt battery and test leads will be
needed for this test.
1. Remove the servomotor from the snowmobile.
2. Contact the red/black servo terminal with the battery
positive lead; then contact the black/red servo termi-
nal with the battery negative lead.
3. The servo should rotate when the negative lead con-
tacts the black/red terminal. Note the direction of
rotation.
4. Reverse the connections on the servo terminals: pos-
itive lead to black/red and negative lead to red/black.
The servomotor should rotate in the opposite direc-
tion.
5. Install the servomotor.
NOTE: If the servo operates correctly in the above
test but fails to operate when connected to the ECU/
CCU/regulator/rectifier at the designated RPM, pro-
ceed to Potentiometer test.
POTENTIOMETER
NOTE: The following test should be made using
MaxiClips and the Fluke Model 77 Multimeter set to
the ohms scale.
1. Remove the servomotor from the snowmobile.
2. Connect the red maxiclip and meter lead to the black/
white servo terminal; then connect the black maxi-
clip and meter lead to the yellow servo terminal.
3. Rotate the servo pulley counterclockwise. The ohms
should increase as the pulley is rotated until it
reaches 4700-5000 ohms.
4. Continue the pulley rotation, and there will be a
small area in the rotation where the ohm reading will
disappear; then it will return again.
5. Continue the pulley rotation, and the ohms should
appear at a very low value but will again increase to
4700-5000 ohms. This is normal operation.
FZ088A
6. Install the servomotor.
NOTE: If the servo operates correctly and the poten-
tiometer test is correct but fails to operate when con-
nected to the ECU/CCU/regulator/rectifier at the
designated RPM, see Troubleshooting Servomotor
chart in this section.
Peak Voltage Output
Tests (500/600 cc)
NOTE: The following tests should be made using
the Fluke Model 77 Multimeter set to the DC Volt scale
with Peak Voltage Reading Adapter. For “engine run-
ning” test, use MaxiClips.
NOTE: Peak Voltage Tests (unless otherwise indi-
cated) were made with connectors unplugged, spark
plugs removed and grounded, and by pulling the
recoil starter rope briskly.
FUEL PUMP COIL
1. Test between the two orange wires in the four-prong
connector from the magneto.
2. Pull the recoil starter rope briskly. Meter reading
must be 12.8V.
INJECTION COIL
1. Test between the two blue/white leads in the connec-
tor harness from the magneto.
2. Pull the recoil starter rope briskly. Meter reading
must be 13.2V.
CAUTION
Care must be taken not to contact the servo yellow,
orange, or black/white terminals, or damage to the
potentiometer circuit will result.
! WARNING
Most voltages generated by the ignition system are
sufficient to interrupt pacemakers! All technicians,
especially those using pacemakers, must avoid con-
tact with all electrical connections when pulling the
recoil starter rope or after the engine has been started.
Manual
Table of Contents
Summary of Contents for Sno Pro 120 2011
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