10.20
ELECTRICAL
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
ELECTRONIC THROTTLE CONTROL
(ETC) SWITCH
Operation Overview
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 below) by throttle cable tension. The
contacts are open during 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 black wire to
ground, which prevents ignition spark. This is the same as
turning the key or engine stop switch “OFF”.
NOTE: ETC will not activate unless there is throttle
plat
e movement off of “zero” detected by the ECU.
Test the ETC switch at the harness connector.
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 Test
1. Remove throttle block cover by carefully releasing all
tabs around edge of cover.
2. Place transmission in neutral and apply parking
br
ake.
3. Start engine and open throttle lever slightly until
e
ngine RPM is just above idle speed.
4. Hold throttle cable with fingers at point “A” as shown
b
elow and release throttle lever. If the ETC system is
functioning properly, the engine will lose spark and
stop.
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