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the ignition relay not the efi relay.

I checked all the wires and switches. The slap switch has two sets of contacts. One that is in parallel with the key switch and teather abd one that energizes the efi relay. This is the one that kills the engine when the slap switch is pushed.

Can anyone tell me the easiest way to access the ecu?

Yeh that's the first thing I checked out. This morning I checked the violet wire to chassis and I didn't get any continuity. The more I think of it the more it seems to be a ground problem. I just need to know now if I can ground the voilet wire to an external ground. These snowmobiles are so...

So apparently a reference ground is the ground for the sensors and other components attached to the ecu. Now I'm wondering if I can ground the violet wire to the chassis to see if it would shut off the engine. I don't want to fry my ecu.

Another update. I checked the voltage at the switch and tether. I got 12v from black to chassis ground and 7.5 volts from black to violet which makes sense I guess because of the throttle switch resistance. It says in the service manual that the violet wire goes to a ground reference on the cpu...

A little update. I got the wiring diagrams and it seems the power from the ecu comes from pin 116 on C100 and returns on pin 226 on C200. I assume the C200 should go to ground but not sure. I'm going to check the voltage on the key switch to see what I get.

Hi all, I just purchased a 2006 FS 750 and when I turn the switch to stop position it doesn't stop. I have to push the kill switch. I have checked all the wiring and switch for continuity and everything is ok. The engine is shutting off because of the power to the efi relay in the kill switch...