The GS-911 is not getting any response from the ECU(s). This could be because of several reasons.
- That you are connecting to the wrong (top-box) plug, especially on RT and GT/L models.
- That you are choosing the wrong model and is thus talking the wrong protocol (CAN vs KLINE).
- The ECU is not powered or not in a condition / able to reply.
- Immobilizer/Alarm still engaged
- kill switch NOT in the RUN position
- Ignition NOT ON
- Neutral NOT selected.
- You are using an extension or adaptor cable with faulty wiring or bent pins.
- The diagnostic connection between the connector and the engine controller is severed (highly unlikely, but possible) or short-circuited.
The best way to check diagnostic connectivity would be to have the bike in Neutral, and start it... while it's idling connect GS-911 and connect to the Engine controller - If you can connect, then you've had one of the issues in (3) above... if you can't then you might have a (4/5) wiring problem.
If you suspect a wiring problem, also perform the Diagnostic Interface Test to check the connector pins for shorts/open circuits.