Your probably referring to the TORS, it's the throttle override sensor. It's the safety switch in the event that your crabs stick open. There is also a senor/switch in the thumb throttle. If you finger is off the thumb throttle and the carbs are still open it shuts the sled down. Sometimes there are problems with the switch so people just disconnect it which can be dangerous.
If it is disconnected, it will be in a loop. It is the TORS like Canuck Said. It is best to have it working to prevent a stuck throttle. To test it, is hard to explain. I'll try my best, I can draw a pic later if needed. Anyways, on the throtle lever, you can see before you start pulling the cables, there should be a little play, and the lever will slide over to take up this slack, which is the handlebar sensor. Hold it back so it cannot take up this slack. Put the parking break on and Push the throttle slowly up to about 4500 to 5000 rpm I believe, and if the phazers have the light on the gauges, you will see the TORS light flash. If so it works. But if there isn't any light, the sled should rev up to about 5000 rpm, but it will not rev any higher. If this doesn't work, and it doesn't flash or continues to idle higher then the sensor doesn't work. So you can either leave it unplugged and have the chance of a stuck throttle ( not a huge deal, but not safe either) or you can get another sensor.
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