2005 Polaris Sportsman 400/500 Service Manual, Page 275Get this manual
ELECTRICAL (THERMISTOR) TEST" for Fan ON and Fan OFF readings on the previous page
ETC OPERATION TEST
Remove throttle block cover by carefully releasing all tabs around edge of coverPlace transmission in neutral and apply parking brakeStart engine and open throttle lever slightly until engine RPM is just above idle speedHold throttle cable with fingers at point "A" as shown below and release throttle leverIf the ETC system is functioning properly, the engine will lose spark and stop
ELECTRONIC THROTTLE CONTROL (ETC) SWITCH
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 CDI black wire to ground, which prevents ignition sparkThis is the same as turning the key or engine stop switch "OFF"Test the ETC switch at the harness connectorNOTE: Adjust throttle cable freeplay (ETC switch) and make sure throttle mechanism is functioning properly before testing the switchRefer to Maintenance Chapter for cable adjustment procedure