KTM 990 Idle Speed Control Stepper Motor Operation

Discussion in 'Dakar champion (950/990)' started by BillyD, Jul 6, 2010.

  1. chevtech

    chevtech Long timer

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    That would work, but there has to be a KTM spec for that idle stop. Best thing to do, would be to figure out what that is!

    :beer
  2. DeepSea

    DeepSea electronically challenged

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    I'll work on those two measurements. My daughters car is broken down in my shop and a few other things in front of it, but will get it as soon as I can.

    Steve
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  3. chevtech

    chevtech Long timer

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    I will try to find an idle stop screw spec!

    :beer
  4. Salzig

    Salzig Long timer

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    Last time I adjusted the TPS, I set it to 0.62V with the throttle forced shut via TuneEcu.
    But yet I screwed the screw :D, so this is likely useless for others.
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  5. Themastermike

    Themastermike Think you caught me in a coma Supporter

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    What is the adjustment procedure for the tps?

    Sent from my SCH-I535 using Tapatalk
  6. Salzig

    Salzig Long timer

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    Who knows?? :D
    I can tell you what works for me.
    I use TuneEcu to force the throttle to fully closed position (under Tests->Adjust throttle cable) and then I adjust the TPS until I read 0.62V.
  7. chevtech

    chevtech Long timer

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    Did you check to see what the TPS voltages are at idle after your (great idea) fixed position set against the throttle stop? I'm guessing a touch high, but at least they should be even and set from a fixed point!
  8. Salzig

    Salzig Long timer

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    Ehm.... I did, but forgot to write it down
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  9. Themastermike

    Themastermike Think you caught me in a coma Supporter

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    So the tps is on a slot type arrangement?

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  10. chevtech

    chevtech Long timer

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    Lol! "Hey got this great way to adjust this thing, but I turned that one screw, and didn't write down that one hugely pertinent voltage info once I was done!"

    You're no help at all!

    ;)
  11. Salzig

    Salzig Long timer

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    LOL!

    Yep.

    [​IMG]

    [​IMG]
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  12. Salzig

    Salzig Long timer

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    Seriously, it's not a crucial info. If you use the S³BAP® (Salzig's Set Screw Based Adjust Procedure) you only need to know the voltage at the fully closed position.

    Also if your bike is sound idle wise, you should take this reading for future reference.
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  13. chevtech

    chevtech Long timer

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    I was just typing, couldn't we just spin the idle stop screw in to set 1450 RPM idle disable stepper motor through tune ECU or pulling the shaft, and then adjust the TPS voltages against that hard stop? Basically what you did, but at target idle RPM, and then back that throttle stop screw off to the factory spec?

    This would be a repeatable and accurate procedure compared to what people are doing now.

    Thinking out loud...

    :hmmmmm
  14. chevtech

    chevtech Long timer

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    What kind of royalties will you be charging for this obviously patentable (plus that's a great name!) procedure?!?


    LMAO!


    :photog :clap
  15. Salzig

    Salzig Long timer

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    I've had that same thought, but don't like the idea of limiting the regulation range of the system.
  16. chevtech

    chevtech Long timer

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    Not following you, I was suggesting to put the idle stop screw back to factory spec, after using it as a hard stop to adjust TPS, and RPM at factory target RPM ~ 1,450 with SM disabled...

    If we move the idle stop back to factory spec after adjusting this just looks like a win/win to me...What are you referring to?

    :dunno
  17. Salzig

    Salzig Long timer

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    I missed the part where you'd set the screw back to stock position.
    But why bother with the screw?
    If your bike is ok, read the voltage and use it for future adjustments.
    If it's having issues, set it to 0.6V see how it goes. With two or three tries you'll find which value is good for your bike and you're gold (unless the TPS it's gone south).
  18. chevtech

    chevtech Long timer

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    Just trying to set-up a protocol that is easy to follow and accurate, I think the combination of what you did, and what I suggested would meet that criteria!

    I want 25% of your royalties! ;)


    :beer


    Todd
  19. Salzig

    Salzig Long timer

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    Done deal :thumb
    :beer
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  20. Stmad

    Stmad Adventurer

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    This is from the service manual ...

    1. Throttle Position Voltage
    System:
    LC8: EFI
    DISPLAY
    Measurement : Throttle Valve PotentiometerUnit: Volts (V)
    TARGET VALUE

    LC8 990 Adv : Device Operation : Fully Closed

    0,56V – 0,64V
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