Forums 🚥 PIT STOP 🔧 Hyosung Technical Help [Bike Mod] GV650 & GT650 : Modification of the TOS sensor (Tip Over Sensor Mod)

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    • #732
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Nov 30, 2017
      @mf448kxn6
      North UK
      GTR
      Points: 3,886

      I did not write this , but give credits to the lad who made this.
      (BTW, follow at your own risk!)


      Quote from book :


      The TOS sensor, the same in the GT650 and GV650, turns the ignition off when an emergency happens
      such as excessive tilting or the tipping over of the bike. If the sensor is not working it will create a situation
      whereby after a short time of about 2 seconds after the ignition is switched off the injection pump is disabled
      and you cannot fire up the engine.
      When this happens, the display will always show an “FI” error. When this happens the sensor should be
      checked. Put the bike into service mode. There should be displayed error c23. This means that the sensor is
      faulty and needs replacing. If there is any problem with buying a new sensor, or the price of about $ 100 is
      too high, you can hand-edit the faulty sensor for the engine to run properly not display FI error. The cost of
      modification is only the purchase of two resistors in the price of .30₵ – .40₵ cents. The only drawback of this
      modification is that if you tip over the bike while running, the ignition will not be stopped.


      📕 DOWNLOAD / VIEW  – 650cc Twins – Tip Over Sensor Mod (.pdf)

      // Meditation doesn't mean you have to sit still....

    • #1662
      adrian
      Member
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      Nov 30, 2017
      @kingcarlot
      wales
      Hyosung GV 650EFI Ltd Ed
      Points: 8

      Very interesting modification, and no other like it on the net. I have problem with my gv650 efi that could  be related to the above, Bike was working perfectly, decided to do a basic service on it, Plugs, oil & filter etc, lifted the tank from where 2 bolts by the battery and used the stay to keep it up, for access to the rear plug, all good so far, had to unbolt the rad and fan etc to allow access to the front plug (stupid design) any how once done turned ignition on (while tank still lifted) to find the pump would go through its prime cycle, (as if the kill switch was on, but wasn’t) it then shortly came up with “CHE” on the dash (the only fly in the ointment to your comments should be F1 – nope) my lad came to help and I said it wont work, he sat on on the bike and turned the ignition on and yep, it primed  and started perfectly! Grrr. This took my attention to the side stand switch, duly changed and nope, same issue seems temperamental when works not work and nothing moved or change to reflect this again Grrr. Have just received a new starter solenoid/relay but my gut says this isn’t the cause as it seems a safety issue cutting power to the pump a’la your topic. Where is the TOS sensor fitted on these? can it be tested easily?  and if i was to replace it you say can use one from another manufacturer, I’m guessing connection is the same, do you know the cheapest option short of your mod? Any suggestion or thought would be appreciated as bike hasn’t been used since April and we have had the best summer since 1976!!

    • #1680
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      @mf448kxn6
      North UK
      GTR
      Points: 3,886

      Hey,

      According to the manual –  The RO Switch (Roll Over) aka. (TOS Tip Over Sensor) is under the seat.
      It should be near the battery,  if you read the above ^ pdf file, you would have a visual idea of where it is.

      According to the service manual (EFI), this is what it says:

      “CHE” : The LCD panel ① indicates “CHE” letters when no communication signal from the ECU is received for 3 seconds.

      C23 = RO/TOS Switch faulty.

      For a more detailed explanation.   Download the link below and go to pages:
      #27, #34, #47, #66 ,
      – Service Manual Link –

       

      Personally I don’t have a TPS sensor on mine, if it did, i’d find ways to get rid of it myself.   But i have no experience in using other brand manufacture TOS sensors on a GV650

      However, the above ^ book at the top, does mention that you may use other brands from “EFi/Ei”  (injected bikes.)  Designs may also vary too.

      This is the most recent TOS sensor hyosung uses that I know dealers to be stocking up,

       

       

      Hope this info helps,  let us know how you get on!

      // Meditation doesn't mean you have to sit still....

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