KTM 990 Idle Speed Control Stepper Motor Operation

Discussion in 'KTM 950/990' started by BillyD, Jul 6, 2010.

  1. Stickboy 990

    Stickboy 990 n00b

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    Could the S/M be the reason why I have surge will riding on highway speed?
    The bike 990 Adventure R 2011 has a Roth filter, Akra with db killer.
    Changes the TPS and ajusted, Now doean't hold iddle and still surge on highway..............
    Next step, change the S/M.......
    I hate this, notting seams clear mostly guestimate LOL
  2. Themastermike

    Themastermike Think you caught me in a coma Supporter

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    Ah, no. Stepper touching nothing at that rpm
    Assume you talking idle stepper


    Sent from my XT1585 using Tapatalk
  3. Stickboy 990

    Stickboy 990 n00b

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    Yes the idle stepper, Hight/ low Idle is every where and now it stalls.
    But I've run the beast with the stepper disconnected and it surged again, good for a 30 minutes but came back. I did change fuel filters.......
    When it surge, I just have to blip the trottle and it comes back ok.
  4. Sumi

    Sumi Long timer

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    That's more like a TPS issue IMO
  5. Stickboy 990

    Stickboy 990 n00b

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    TPS is new...........I hate these grimlins
  6. chevtech

    chevtech Long timer

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    Pretty well established the surge at cruise is the system responding to O2 sensor inputs. Many remove their O2 sensors for this very reason. However, if they are older, and higher mileage you could also have what we used to call a "lazy O2 sensor" which means is still responds but very slowly, causing the motor to surge even more than normal. O2 sensors are a wear item, they will not last forever. If you have over ~ 50K miles they might be tired. You need a labscope to see the pattern, but occasionally it is slow enough you can catch it with a multi meter.

    Hope that helps!


    Todd
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  7. Stickboy 990

    Stickboy 990 n00b

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    Could they be bypass with resistence or just unplug them. Can I unplug them for testing.
  8. mousitsas

    mousitsas Long timer

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    If you have a tuneEcu cable, then better tick them off via the software. If not, unplug them and put resistors.
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  9. TonyJenkins

    TonyJenkins Adventurer

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    Hey, new to this thread guys. Have a ‘13 990 Adventure Baja and I’m having trouble with the throttle racing. Was out on gravel roads, wiped out bad because when I let off the throttle, it actually cranked up instead of dropping off. Laid the bike down hard.
    My KTM guy (after checking it out) says the TPS is more than likely bad. KTM told him the TPS cannot be changed out, need a whole new throttle body. Well FM, it’s close to a $2k job? I’ve scanned through here and see that the Triumph TPS is the same motor but my mechanic says that KTM told him the TPS is molded to the throttle shaft, you can’t just change out the TPS.

    Can someone give me the cliff notes to a fix?
    1). Do I need to get a new throttle body or can I get the Triumph part to work? What is the part number of said TPS?
    2) Can anyone point me to a video or step by step to get this corrected?
    3) Help

    Thank you
  10. gefr

    gefr Life is a trip

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    You can buy the TPS separately from KTM as well:
    See here:
    http://www.munnracing.com/
    Main Catalog [​IMG] 2013 [​IMG] 990 ADVENTURE BAJA
    (ENGINE)
    61041077000 $124
    The problem is you need to open a hole to the airbox in order to be able to adjust it, without removing the whole airbox each time.
    You need to measure 0.55V when idling according to manual.
    Have a look in the ktm950info.
    Cheers

    Sorry,. I got confused which TPS is the faulty one. It usually is the right hand side when sitting on the bike, on the front throttle body. The 2 are not identical.
    Cheers
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  11. TonyJenkins

    TonyJenkins Adventurer

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    Sorry, problem is in the stepper motor and gears, not sensor, my bad.

    Mechanic says that the stepper motors have plastic gears and that those gears strip out. Know anything about that? Is the stepper motor replaceable? Anyone know?

    I HAVE to believe that there is a way to change out the stepper motor...changing out the entire throttle body just doesn’t make sense.
  12. paulo.ag.gomes

    paulo.ag.gomes Sr

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    0.55Volts ou 0.65Volts ?
  13. paulo.ag.gomes

    paulo.ag.gomes Sr

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    Triumph - T1241182
    https://www.worldoftriumph.com/part-search?partnumber=T1241182

    KTM - 61041060000
    https://ktm-versand.de/en/spare-parts/52931/isc-stepper-motor-05
  14. TonyJenkins

    TonyJenkins Adventurer

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    The mechanic adjusted the tps and throttle body sync at idle...but also he noticed the throttle lock was not locked in the off position (not to mention I’ve dropped in quite a few times on the trail on that side) ...all that and it could have been that the throttle lock was catching just enough of the throttle to mess with it.
    I’ve only got a hundred or so miles on it since he gave it back to me and it’s been running flawlessly....I’ll report if anything else turns up in the future.