Bruce
On a Hyabusa or injected Suzuki's in general and Aprilia's which use the same switch
The switch itself is a U shaped bit of brass with a ring sitting in the U which when inverted, generally makes a contact and turns the fuel pump relay off. I say generally, because unlike a proper switch, there is no spring to put pressure on the contact and it relies entirely on gravity acting on a small brass ring
The tip over switch has a resistor in it
It's sent a signal by the engine management to check and see if the switch is still connected
If the engine management doesn't see the resistor, it turns off the fuel pump relay which also powers the injectors and coils
The thing about them is, they turn the relay off only when the switch is making contact
Or if you roll over, it turns off until you are upright again, then it turns back on
So they can produce an intermittent fault just from vibration, which only shows up as a memorized fault code when you plug in the diagnostic tool
The other thing they do , and this is a Suzuki thing. If it's disconnected, the bike will start and run for just the length of time the fuel pump primes and then stop.
The Hyabusa TOS Has a black wire coming from the engine management to a Black/Yellow group of wires
G
