Exhaust butterfly valve servo motor inoperative

[Bobnostart]

Good afternoon, Have spent sometime working on the exhaust butterfly valve to free it up. All went well until I did the functional check at the end. With ignition on the valve servo motor did not move (did not close/open during the ECU BIT ((built in test)). Removed the servo motor to try and bench check it. The Haynes wiring diagrams only give the wire numbers and colours, but not what they do. Checking the bike plug, I found battery voltage on pin 3, 4 volts on pins 1 & 2 and nothing on pin 4.
I suspect they will be diodes in the circuit. Does anyone out there have a decent wiring diagram for the servo motor or does anyone have a tried and tested method to bench check the motor to prove its serviceability.
Thanks

 

[casbar]

Good afternoon, Have spent sometime working on the exhaust butterfly valve to free it up. All went well until I did the functional check at the end. With ignition on the valve servo motor did not move (did not close/open during the ECU BIT ((built in test)). Removed the servo motor to try and bench check it. The Haynes wiring diagrams only give the wire numbers and colours, but not what they do. Checking the bike plug, I found battery voltage on pin 3, 4 volts on pins 1 & 2 and nothing on pin 4.
I suspect they will be diodes in the circuit. Does anyone out there have a decent wiring diagram for the servo motor or does anyone have a tried and tested method to bench check the motor to prove its serviceability.
Thanks

The flap doesn't move on ignition on anymore. There was a software update. It only moves now once the engine is running. I would leave the cover off and start the bike and rev it and see if it moves.

 

[Bobnostart]

Hello casbar, took your advice and refitted the exhaust butterfly valve servo motor assembly. Did not think anything would change but to my surprise it all sprung back to life. On switching on the ignition, the valve was driven from fully open to fully closed and back to fully opened in a second. The initial BIT is back. Started my bike and monitored the valve position. Almost closed at idle and fully open at about 6000 rpm. The response was instant and very positive. The butterfly valve has plenty of copper slip grease on it, so hopefully it will last a few months. Will plan to service the valve twice a year.
Thanks for your advice.