Arctic Cat Sno Pro 120 2011, Service Manual

Page: 222 / 535

3-43
3
If the servo is commanded to move but the potentiometer
output voltage does not change, an error occurs and the
check engine light will flash a trouble code.
Improper servomotor position sensing is normally caused
by one or more of the following:
A. Incorrect exhaust valve cable length (too long or
too short).
B. Exhaust valve cable(s) sticking, broken, or dis-
connected at pulley.
C. Exhaust valves sticking.
D. Exhaust valve spring(s) weak or broken.
Check each of the above probable causes in the order
given to locate the problem of the servomotor cycling
three times in succession; then shutting down.
Check for correct exhaust valve cable length specifica-
tions for model being worked on in this section.
Servomotor Makes No Attempt To
Cycle
If when running the engine the servomotor makes no
attempt to operate, this is caused by one or more of the
following:
A. Bad connection from the wiring harness and con-
nector from the lighting coil to the CCU (600 cc),
to the ECU, or from the ECU to servomotor.
B. CCU output (gauge/taillight/APV) is shorted or
open (600 cc).
C. ECU output to servomotor is too low.
D. Servomotor failure.
E. Blown fuse.
F. Voltage Regulator/Rectifier (800/1000 cc).

NOTE: For testing individual APV system compo-
nents, see Section 5.
MAINTENANCE
The APV system requires only periodic cleaning and
cable adjustment. The cables should be checked every
1000-2000 miles and adjusted as necessary. To ensure
maximum performance and minimize maintenance
requirements, Arctic Cat recommends using Arctic Cat
Synthetic APV 2-Cycle Oil. Using oils other than the rec-
ommended oil may increase the frequency of required
cleaning due to increased buildup of carbon deposits.
CABLE ADJUSTMENT
Proper cable adjustment is critical to the operation of the
APV system. Although inspecting cable adjustment is
recommended every 1000-2000 miles, the cable should
not need adjustment often. To check the cable adjust-
ment, use the following procedure.
1. Using a small needle-nose pliers, remove the servo-
motor retaining clip (800/1000 cc) and the cable
holder.
FS273A
CM127
2. Rotate the servomotor actuator counterclockwise to
loosen the cable; then pull the cable housings down
and out of the servomotor.
CM123A

NOTE: For installing purposes, note the side that
the servomotor cables are installed on.
3. Slide each cable drum out of the slot of the servomo-
tor actuator.
Manual
Table of Contents