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No throttle response, where to start?

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  • cmcjoinery@live.co.uk
    replied
    Hi guys thought I’d just Jump back this one as we started having the same issues again, so all sensors brake, kick stand ect deleted, turn on bike all lights up as it should, let it calibrate, no throttle response at all, took it in the house as thought maybe condensation in the garage, to let it dry out, still nothing after a week, contacted sur ron support and was advised to try the throttle whilst the fault blinker thing was attached as it was saying everything fine, got 3 blinks with half throttle, sur ron says its either ac dc unit or the controller, cheaper option being the ac dc, so decided to start taking it apart, had the controller almost out as I was going to test it with multi meter but decided to try moving
    some cables about, low and behold it is the new throttle cable oem part just fitted, moved the wire and the sur ron went, so now I know it’s not the controller or the ac dc box just another throttle hope this helps anyone struggling to get to the problem

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  • Knobby1
    replied
    I think paxtana in your other thread, which you linked above, gave good advice: look for an intermittent connection. Likely culprits are connectors as you know, but anything is possible here as paxtana's example points out. Leave no wire unturned (literally) in your inspection. The fact that it is failed most of the time is a blessing.

    If somehow you cld find a donor surron, you cld start by swapping major components to see if it is one of those. Either way you will be disassembling a lot to find it. For sure i'd be removing, temporarily, all the wiring i cld to elim as much as possible from the puzzle. Good luck.

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  • tomp81
    replied
    Whoops, I posted in the wrong sub-forum (link here). Re-posting below, hoping that someone will be able to offer some suggestions:

    2-3 weeks ago my son went riding in the rain, likely that he got something wet. The throttle became intermittent – it’d stop working, but two minutes or so later, turning on the bike again would make it work. But not for long. I can replicate that in the garage even now. The throttle will work for 5-15 seconds, then become unresponsive.

    I had already removed the brake sensors in the past, but today I also removed the kickstand sensor and the bike-fell-over sensors, just to simplify the context. I did the “SR Throttle test” (https://electricbike.com/forum/forum...273#post115273) and saw the expected voltages. So it’s likely not a throttle problem.

    The LED tester shows one blink, meaning “system ok.”

    Next I tried Pascal’s tail light diode debugging, I disconnected the tail light by removing the two pigtail connectors on the light itself. No difference. I followed the wiring to the front of the bike but didn't see an easy connector to disconnect the lights from that side. Never did find the diode, or was able to check for humidity around it.

    I did order a new throttle, and hooking it up from "the side," just to test it, was promising. I was able to ride the bike around the garage for a minute. Alas, when I went to properly install it, the bike was unresponsive again...

    Even before the new throttle, i.e. with the old throttle, the bike would randomly work for 5-10 seconds and then be unresponsive for the next few days. The voltages are reading right (even with old throttle), and the intermittent nature has me stumped.

    I read the "deadly problem" thread on the voltages in throttle wiring: https://electricbike.com/forum/forum...ur-ron-problem, but am unsure exactly where to pick up another ground. So many ground wires everywhere... and I'd like to not make any non-reversible changes.

    I got some good suggestions from "paxtana," much appreciated, re-posting here just in case someone else might have other ideas too. Thank you,

    Tom

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  • Knobby1
    replied
    Interesting thread. Here in the US our surons aren't legal to ride on the highway (tho a lot of us do sometimes anyway) so our rear light does not turn on if we apply the brakes. We also don't have turn signals. Out headlight and rear light turn on when we turn the key on, there is no switch to turn them off.


    I modified my wiring to add a switch that enables me to turn off the headlight and rear light with one switch. I vaguely remember there being an extra wire in the wires running to the rear light. I will have to check that. Thanks for posting.

    I've always been a little concerned about the brake, kickstand, and tip-over sensors or wiring stoping my bike from moving. I sometimes ride many miles (and more kms) away from civilization, sometimes on steep grades. Pushing the bike back is such a concern I carry tools to remove the chain , and a bag to put it in, to make the pushing easier. I think I need to figure out my wiring and add a switch to disable the safety circuits.

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  • cmcjoinery@live.co.uk
    replied
    Had the same problem, battery 100% lights on everything looking as it should, no throttle, disconnect brake sensors, removed tilt sensor and disconnected stand sensor still no throttle, removed motor and checked magnet/hall sensor all looking good, tested fuses all good, read the thread above about the back light, this seems to be hard wired to the battery connector so could not disconnect it, put the hair dryer on the back light following the wire for 20 mins tried in and got throttle, so makes sense if the diode on the wiring is wet it will not let the motor run, hope this helps

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  • Suron420
    replied
    So I went into my eggrider settings and after writing some.new changes my throttle has stopped working but have full power and all other setting have save accordingly

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  • dirtman
    commented on 's reply
    ""My 1 week old bike"'" '''connector bundle underneath the engine cover was full of water'"
    How deep was the river or flood you drove thru.??
    Turn around.. Don`t drown or ruin your Electric SRX-LB

  • Lolaso81
    commented on 's reply
    Pascal. Thank you for this. Quick question, where is this piece that you are talking about? I can’t find this connector any place…

  • Lolaso81
    commented on 's reply
    We’re you able to find out where the connector was located? I’m having the same problem as you guys.

  • Odium
    replied
    I had this problem today with my 1 week old bike. First I removed the break sensors, but it didn't work so I searched online and I found this thread.
    My issue was that the connector bundle underneath the engine cover was full of water and especially the tail break light connector was wet. Dried it out and it works fine now.
    When I get time I will pull this entire bundle out and replace all collectors with waterproof cable crimps.

    This design is very poor from sur Ron

    Leave a comment:


  • Trail Blazer
    replied
    Where is this connector / diode located?

    Leave a comment:


  • Pascal
    replied
    Hi everyone,
    as i said on the previous message,: problem solved.........

    so here it is.
    I hope my english will be good enough for everyone to understand my point.

    We all went through the basic checking point as
    • stand sensor
    • brake sensor X2
    • fall sensor
    • throttle controller position.
    • all plugs for moisture infiltration and / or dammage.
    but if , after having driven on very wet surface or, like me after a good washing, you loose the throttle respond, there is another thing to check :

    unplug your tail light and test your bike.

    it sounds stupid but let me explain .

    as many owners of this wonderfull toy, i'm sure we all agree about the fact that the tail light original position is...........UGLY!!!!

    so i decided to dismount it and to place it under the seat as a normal enduro bike.
    doing this, i realised that the wiring was too long. So i shaped it, taped it, shrinked it so it could fit just behind the tail light.
    This wiring section is now very much exposed to moisture.

    Now comes the funny part.....

    Tail light : how does it work :
    it is a light made of LED bulbs.
    to power it, you have 3 wires
    • green = ground
    • brown = tail light (12v)
    • orange = brake and stop light (12v)
    but brown and orange wires power the same LED through different resistance (that changes the brightness)

    When turning on the ignition, the back light turns on.
    you have entering the light 12v from the brown wire.

    BUT, if you check, it brings about 6 volts into the orange wire from the tail light to the bike............

    In order to avoid this, our nice chinise friend did hide in the wiring, into the tape wraping a DIODE !!!!!

    I found mine close to the tail light but the location on my other sur ron is different. (see the pictures)
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    my problem was moisture on this diode that was creating a electrical bridge and allowing the 6 volts to travel from the tail light to the bike.
    the problem is that this orange wire is connected after the brake sensor.... So if the wire is powered , the bike understand it as if you were braking for real...... and cut the power of the engine......

    The other problem (on my other sur ron is that by shaping the wiring to fit under the seat, i broke this diod and shot curcuited it..... same result......

    hoping this will help people facing this issue.....
    the start test is simple before disounting all the bike : unplug the tail light.
    Have fun everyone.
    best
    Pascal


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  • Pascal
    replied
    Hi guys......
    good news....i found the problem on my bike......
    I'm driving home and will write about it.
    A+

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  • erectorsetsinc1
    replied
    I had throttle cut out issues after a very wet muddy ride two days ago. I brought the bike to my shop to work on it today and tested it out before spending some time taking everything apart. Happily, everything seems fine and working great for a quick 15 minute test ride. I don't have time to test sensors but if I test tomorrow and there are no further issues - then it must have been the wetness affecting the sensors. I will update if there is a change but for now -- Be careful with really wet rides!

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  • Tommycat
    replied
    For some electrical troubleshooting tips on the throttle its self, take a few minutes and read thru this thread...

    Hello! I just recieved my Used Sur-Ron 2018. I did a few very short trips around the yard and it was ok. My brother came over today to look at it and he had a few trips in our yard aswell. I jumped on the bike and everything was fine, i did a high speed run and then when i went to turn around it just took off and landed maybe 4



    Regards,
    T.C.

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