Noisy Throttle/Servo after Flash?

[tebe]

I have a 2016 FJ09 with less than 4,000 miles.  Bike is in great condition, but I needed to do something about that classic Yamaha jerky roll on/off throttle response.  Took advantage of 2WDW recent deal and had a full ECU flash done with my OE exhaust.  Communication was great.  Turnaround was great.  I reassembled bike and the ride was better than great!  Totally satisfied.  Smooth and powerful/predictable now in A Mode.  Highly recommend 2WDW!  One question though.  After the reinstall of the flashed ECU, I had ignition switched on with engine off to verify turn signals, fuel gauge etc.  Dash lit right up and went to Mode A.  Great, no problem.  But, my question is, after the flash with ignition on and engine off, when I rotate the throttle, I get a dry grinding sound from the servo.  I turn ignition off and rotation of the throttle is silky smooth.  When  I turn the ignition on and power system up,  is only time I get a noisy dry sound from servo motor.  Has anyone else experienced this?  To be honest it may have made a different noise before the ECU flash, but now it is very noticeable.  Can some one out there without a flash tell me if their stock ECU servo makes different noises when turning the throttle with/without the with ignition on?  Also can someone with a 2WDW flash tell me if they get the same noisy results?  I love the results of flash, I am just concerned I might be damaging servo.    

[betoney]

28 minutes ago, tebe said:

But, my question is, after the flash with ignition on and engine off, when I rotate the throttle, I get a dry grinding sound from the servo.  I turn ignition off and rotation of the throttle is silky smooth. 

Can some one out there without a flash tell me if their stock ECU servo makes different noises when turning the throttle with/without the with ignition on?  Also can someone with a 2WDW flash tell me if they get the same noisy results?  I love the results of flash, I am just concerned I might be damaging servo.    

I have the 2WDW flash, just went out to the garage to check for you.  With ignition turned OFF, I turn the throttle and get no sound, I turn ON the ignition, wait 5 seconds and turn the throttle and still get no sound.  The only sound I can hear is a faint 'click' of the throttle cable pulley hitting the throttle stop when I turn the throttle closed.

[tebe]

Thanks for checking, betony.  When you turn your ignition on, after initial bike self-diagnostic check, do you get the high pitch electronic wining sound?  When I twist the throttle now, besides the servo dry grinding noise, this electronic wining sound also changes pitch and is even intermittent on throttle roll off.  But engine ran great on hour ride after ECU flash.   Surprising these noises started right after flash.  I contacted 2WDW.  They said they have never heard of this happening before. Not to worry about it unless it actually causes rideability issue.  Maybe I have an ailing APS.  2016 model year manufactured in August 2105 with only 3,351 miles. A left over dealer demo bike bought with full warranty.

[betoney]

41 minutes ago, tebe said:

Thanks for checking, betony.  When you turn your ignition on, after initial bike self-diagnostic check, do you get the high pitch electronic wining sound?  When I twist the throttle now, besides the servo dry grinding noise, this electronic wining sound also changes pitch and is even intermittent on throttle roll off.  But engine ran great on hour ride after ECU flash.   Surprising these noises started right after flash.  I contacted 2WDW.  They said they have never heard of this happening before. Not to worry about it unless it actually causes rideability issue.  Maybe I have an ailing APS.  2016 model year manufactured in August 2105 with only 3,351 miles. A left over dealer demo bike bought with full warranty.

Just checked again, when key is turned on I believe the fuel pump primes for a few seconds (if I am wrong about that, someone please correct me) but other than that, there is no noise whatsoever.  Turning the throttle does nothing, in fact I don't think it should do anything unless the engine is running. Maybe call 2WDW back to verify that.

[tebe]

Thanks again, betony.  Ever since I owned this bike, from day one, I have had a high pitch electronic wining sound come on with ignition switch.  It was not obnoxious, overwhelming.  Just thought it was normal for the bike's electronics.  But now it is much louder.  I have body work/tank off to check APS and wiring, so throttle/servo dry grinding and this variable pitch wine are much more pronounced.  I am going to check TPS connector and then re-assemble bike and ride it again.  Looks like I will be making a Covid19 era appointment with Yamaha dealer to investigate.  Something is not right. 

[skipperT]

Normal sound. 

What you’re hearing is the YCC-T servo motor. It doesn’t change when you twist the throttle with the engine off and key on because the ECM won’t allow it - it’s waiting for you to rotate the starter and fire the engine before it will allow it. At which point, you can’t hear the servo motor over the engine cranking. 

if you have a 15 or 16 model, you can execute DIAG Mode and go to channel 15 and rotate the throttle grip to actually hear the throttle plates moving. otherwise it’s dealership laptop hookup time if you want to verify. 
why is it louder after the flash? That one I cannot answer - but maybe TWDW has it programmed to a slightly different position for starting, hence a different pitch sound. 
If the bike runs fine with no DTC’s then don’t worry anymore about it.  

Oh, just though of something else - pull the ETV fuse from the rear fuse box under the main seat (5 or 7.5a I forget which) and then key on the bike. If you don’t hear the sound anymore, then there’s another way to confirm it.

This may trigger a DTC however... and might need to be cleared.

-Skip
 

Edited August 7, 2020 by skipperT

[tebe]

I don't know, Skip...Tonight I removed Airbox to inspect wiring and TPS.  With airbox off I connected my new 2WDW flashed ECU and turned ignition on.  Without engine running I can hear the servo motor high pitch humming all the way across the garage, (but this is with gas tank, airbox and bodywork off bike). BUT with the ignition keyed on without engine running, I can twist my throttle and hear the Servo motor move and watch the butterfly Throttle Plates Rotate.  As I turn throttle, and watch plates rotate, the Servo humming changes pitch. I think betoney agrees with what you say.  He hears no servo or butterfly plates moving, no change in sound, when he turns his throttle with key on and engine off.  I can only guess that when 2WDW flashed my OE ECU, their new program does not need to have starter turning or engine running to have servo motor respond to APS signal.  The bike started and ran great with flashed ECU.  It is just that I had never heard this engine off servo motor dry grinding sound or changing pitch before because of running engine noise.  Friday I am going to contact 2WDW again and ask about the starter/running engine interlock.  2WDW had already told me they had never heard of this noise before and if bike was running fine with no ill effect,  to just ignore it.  But I would like the peace of mind knowing I am not going to have to replace a servo motor in near future.  Thanks.   

[skipperT]

Sounds like you have a good plan. Maybe record a short vid to provide to TWDW while your bike is apart that they can view as well. 
good luck!

-Skip

Edited August 7, 2020 by skipperT

[tebe]

I had already sent 2WDW emailed videos and we have exchanged multiple texts discussing my question of servo control.  They have been very quick to respond.   They say their FTECU software doesn't have any option for them to modify any throttle interlocks or any other parameter that controls throttle opening while the bike isn't running. They only have control over the fuel mapping per cylinder (by gear), ignition mapping per cylinder (by gear), throttle-by-wire mapping per rider mode (by gear), the diagnostic code manager, fan temperature control, and closed loop operation control.  I cannot explain it, but now, after flash with ignition on & engine off, ECU can command servo to open/close throttle plates with the twist of a wrist!  For the life of me, I do not remember this happening with my stock OE ECU.  Bottom line is 2WDW flash greatly improves engine roll on/off.  It is smooth and powerful/predictable now in start-up A Mode.  I highly recommend.  When ECU is permitted to control servo motor is still a mystery to me.