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Servomotor Test
��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
terminal with the battery negative lead.
3. The servo should rotate when the negative lead
contacts the black/red terminal. Note the direction
of rotation.
4. Reverse the connections on the servo terminals:
positive lead to black/red and negative lead to red/
black. The servomotor should rotate in the opposite
direction.
5. Install the servomotor.
��NOTE: If the servo operates correctly in the
above test but fails to operate when connected to
the ECU/CDI at the designated RPM, proceed to
Potentiometer Test.
Potentiometer Test
��NOTE: The following test should be made using
MaxiClips (p/n 0744-041) and the Fluke Model 73
Multimeter (p/n 0644-191) 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
maxiclip 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 at which 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 ohms. This is normal operation.
6. Install the servomotor.
��NOTE: If the servo operates correctly and the
potentiometer test is correct but fails to operate
when connected to the ECU/CDI at the designated
RPM, replace the ECU/CDI.