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Thread: Dorsoduro switching power modes automatically and not starting

  1. #1
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    Dorsoduro switching power modes automatically and not starting

    Hello,

    A few days ago my 2013 750 started switching power modes on its own while riding, from sport>touring>rain etc to randomly shutting off and then starting on its own. I disassembled the starter switch and there was a slightly tweaky connection and fixing this removed the issue for a few days.

    However it came back, the bike switched power mode only 1 time and then completely died. Dash powers on, fuel pump primes but when I press the starter switch nothing happens, not even a click.

    I disassembled the starter switch again, everything seems fine, battery is new/connections are fine, grounding on the starter motor looks fine. What could cause this?

  2. #2
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    Check the starter switch plug, it's behind the radiator, just loosen the radiator and you can reach it, mine was loose

    Sent from my ONEPLUS A6013 using Tapatalk

  3. #3
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    Quote Originally Posted by shoottokill View Post
    Check the starter switch plug, it's behind the radiator, just loosen the radiator and you can reach it, mine was loose

    Sent from my ONEPLUS A6013 using Tapatalk
    Thanks, but it wasn't about this. Anyways, bike starts now, but is haunted. I can't figure this out and it's driving me insane.

    After reading the forums I thought it was about the resistance module, but after measuring it the diodes seem fine. I can ride my bike for ~10-15minutes (cold>hot, with/without the resistance module in) until the problem appears out of nowhere (changing Power modes like crazy, shutting/starting, like the bike is haunted).

    After the problems appear I can no longer switch power modes myself, the bike changes them how it wants. If the resistance module is off (or I take it off) once the problems have appeared, the bike will start by itself as soon as I turn the ignition on (starter motor will also stick for a few seconds) however if I plug the module in, it will not start automatically but randomly instead.

    After waiting for 30 mins for the bike to cool down, I can ride just normally for 10mins again until it starts all over again. Very hard to explain but all suggestions are greatly appreciated.. Could the problem be on solenoid/relays? Wouldn't they go 100% kaput instead of randomly like this?

    + My bike has worked perfectly for several years, it has 45k km / 28k miles on it and all this started very shortly after washing the bike, so it must have something to do with that Already went through pretty much all connections and relays with electric degreaser.
    Last edited by Leksies; 06-19-2019 at 10:40 AM.

  4. #4
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    Did you measure / fault test the resistance module when it was hot?

    Interesting that it makes a difference if it's connected, implying an intermittent (dis)connection when hot?

    Have you tried bypassing the switchgear?
    2009 Shiver (White) | UK

  5. #5
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    Quote Originally Posted by IndelibleInk View Post
    Did you measure / fault test the resistance module when it was hot?

    Interesting that it makes a difference if it's connected, implying an intermittent (dis)connection when hot?

    Have you tried bypassing the switchgear?
    Yes, I measured the diodes before and after problem occurs - no difference.

    I have also taken the starter button "out" of the handlebar and messing with its wires, twiddling it, pressing it when the problem occurs, no difference whatsoever. Here is a video of the problem shot just 30 minutes ago when I was coming home from work, in the video it didn't randomly shut down and start, but it does that too: https://www.youtube.com/watch?v=HlMj...ature=youtu.be

    However I did just notice that Fuse A/10amp keeps blowing, which is for Coil, Light Logic Relay, Recovery Logic Relay, Stop, Horn, Tail Lights, Licence Plate Light. My bike backfires a lot, but it has been doing that for ages (straight pipe+mivv slipon) so coil issue? or Recovery Logic Relay? No idea what that even does lol.

  6. #6
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    The video is unavailable, it says.

    I think it might be the dash, or just the connector - they are prone to condensation inside corroding stuff.


    Fuse A feeds a lot of "logic" through the switchgear and into the dash; nothing to do with the coils / plugs; the recovery relay switches the brake light on as a "diagnostic" - e.g. brief flash on key-on to signal throttle body position sensor zeroing, and on solidly if the the handle learning needs to be done etc.

    But fuse A should also have nothing to do with the starter button, which the ECU clearly thinks is being pressed - the only direct connection there would be the hazards button, which your bike shouldn't have?

    The resistor module is involved with both the ECU and dash's "interpreting" the starter button position, which might explain the subtle change in behaviour with and without it. Perhaps a short inside the dash is sending false starter signals to the ECU?


    Have a look at the wiring diagram AF1 have on their shop, it might help.
    2009 Shiver (White) | UK

  7. #7
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    Quote Originally Posted by shoottokill View Post
    Check the starter switch plug, it's behind the radiator, just loosen the radiator and you can reach it, mine was loose
    Quote Originally Posted by IndelibleInk View Post
    I think it might be the dash, or just the connector - they are prone to condensation inside corroding stuff
    Thank you both for your help.

    I finally found the issue and it was the ignition lock's connector with just 2 wires behind the radiator. The connector looked neat & tight outside, but the terminals/wires inside were pretty oxidized/worn and not giving a steady connection. I stripped the wires & put new terminal connectors and the bike works like a charm once again!
    Last edited by Leksies; 06-27-2019 at 04:17 PM.

  8. #8
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    Good stuff, glad you fixed it and thanks for reporting the fix!
    2009 Shiver (White) | UK

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