Polaris Trail Boss 330 2003 Service Manual page 190

ELECTRICAL
ELECTRONIC THROTTLE
CONTROL (ETC) SWITCH
(COMPOSITE THROTTLE
HOUSING)
The Electronic Throttle Control (ETC) system is
designed to stop the engine of an ATV in the event of
a mechanical problem with the throttle mechanism.
The ETC switch is mounted independently of the
throttle actuator lever inside the throttle block
assembly. This is a normally closed switch, and is
held in the open position (contacts are separated as
shown in Illustration 1) by throttle cable tension. The
contacts are "open" in normal operation regardless of
throttle lever position. In the event of a mechanical
problem in the throttle mechanism (cable tension is
lost), the switch contacts close, connecting the CDI
black wire to ground, preventing ignition spark. This
is the same as turning the key or engine stop switch
"OFF".
Electronic Throttle Control (ETC) Switch
(Composite Throttle Housing)
Illustration 1
ETC switch contacts are
closed in fault condition
(throttle cable slack).
Test the ETC switch at the harness connector. NOTE:
Adjust throttle cable freeplay (ETC switch) and make
sure throttle mechanism is functioning properly before
testing the switch. Refer to Maintenance Chapter 2
for cable adjustment procedure.
ETC OPERATION TEST
1. Remove throttle block cover by carefully
releasing all tabs around edge of cover.
2. Place transmission in neutral and apply parking
brake.
3. Start engine and open throttle lever slightly until
engine RPM is just above idle speed.
4. Hold throttle cable with fingers at point "A" as
shown below and release throttle lever. If the
ETC system is functioning properly, the engine
will lose spark and stop.
Switch contacts are open
during normal operation
A
Blk
Brn Brn
10.7