2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 384Get this manual
ELECTRICAL 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 mechanical problem with the throttle mechanismThe ETC switch is mounted independently of the throttle actuator lever inside the throttle block assemblyThis is normally closed switch, and is held in the open position (contacts are separated (as shown below) by throttle cable tensionThe contacts are open during normal operation regardless of throttle lever positionIn the event of mechanical problem in the throttle mechanism (cable tension is lost), the switch contacts close, connecting the black wire to ground, which prevents ignition sparkThis is the same as turning the key or engine stop switch "OFF"NOTE: ETC will not activate unless there is throttle plate movement off of "zero" detected by the ECUTest the ETC switch at the harness connectorAdjust throttle cable freeplay (ETC switch) and make sure throttle mechanism is functioning properly before testing the switchRefer to Maintenance Chapter for cable adjustment procedure