Page 2 of 3 FirstFirst 123 LastLast
Results 16 to 30 of 45

Thread: Cleaning of the stepper motor

  1. #16
    apriliaforum expert deefred's Avatar
    Join Date
    Sep 2004
    Location
    Sweden, Linköping
    Posts
    5,657
    Sorry,
    For the TPS to be set to zero you need to go to a workshop with the Axone tool or if you know someone who has the tuneboy cable.

    It can not be done otherwise.
    2001 RST Futura in stream Silver.
    Mods: Modified Öhlins fork from mille R, EBC brake discs, HEL front brakelines, Carbon RS 250 front fender, Wiring mod for charging. Engine related:05 map, Iridium plugs, tuneboy, derestriced intake, old mille airboot, staintunes exhaust. Lambda bung hardbrazed in the "breadbox". Öhlins mille R rear shock with 110N/mm spring and the integrated hydraulic preload adjuster. LED Voltmeter installed inside the dash for monitoring charging. Duc 999 radial m/c for brake and clutch. EBC 320mm brake discs
    NWS hugger. Equipment: Famsa tankbag,
    CBR 600 -07 MOSFET R&R FH008EE providing stable 14.4 - 14.5 V (with my wiring mod). Daytona heated grips with mccoi pwm controller and automatic chain oiler

  2. #17
    apriliaforum Member Smok3's Avatar
    Join Date
    Dec 2007
    Location
    Romania,Bucharest
    Posts
    195
    Quote Originally Posted by deefred View Post
    Sorry,
    For the TPS to be set to zero you need to go to a workshop with the Axone tool or if you know someone who has the tuneboy cable.

    It can not be done otherwise.
    Grrrrr service again
    are not good mechanic in Romania from Aprilia
    ...in service do not know guys from Aprilia the oil to change by the book last time had 4L of oil in engine,not all related to the air box,and I came home with 2 screws and lost on the way.
    That prefer to do my own thing to the engine and ask the forum here.


    Thanks again I see it as a follow up to solve
    -2001 RST Futura wearing Black.
    -Devil Magnum Exhaust ,Metal fuel line disconnect,Wiring mod done and waterproof conectors Reg/Rec Mod,Hepco-becker,Aftermarket Sliders,Onboard voltmeter,K&N inside but with the stok air box,HID = 1 X 35 W Low,2 x 55 W High,Saito heated grips,12 V Socket, SOLD @ 73 k KM and 11 k Mile
    - buy Honda VFR800 Vtec,Full Givi,touring windshield.....and that's all for now

  3. #18
    %@*#&! hank's Avatar
    Join Date
    Jul 2003
    Location
    Earth
    Posts
    13,858
    Now a sticky in the 1000cc FAQ section

  4. #19
    apriliaforum expert Motech's Avatar
    Join Date
    Aug 2006
    Location
    Santa Cruz, CA
    Posts
    3,130
    Idle Air Control Valves (IAC) are often referred to as "stepper" motors due to the scope patterns they produce when activated. The patterns resemble the side view of a stairway. As Deefred's pictures show, they incorporate a plunger attached to a worm gear, which is moved in and out of a bore via DC motors and a rotary gear.

    Cleaning the IAC--any IAC--is usually a final attempt to salvage a malfunctioning unit. Sometimes it works, but it's always temporary; most time it does not. If the plunger and bore have become dirty enough to jam up and prevent the motor from smoothly moving the plunger in and out of the bore, the motor is usually compromised and needs to be replaced.

    Most IAC cleaning is futile, but since our bikes utilize a separate bore housing that allows total exposure of the plunger, it is not as tricky to service as most other types, and less likely to suffer additional damage from cleaning. This should be considered maintenance. If an IAC truly is binding, or not opening and closing as designed, additional troubleshooting is highly recommended.

    Commanding the IAC to close until the worm gear, plunger and spring are ejected is not a wise idea. As Deefred noted, it could easily result in loss of critical parts. It is also very easy to damage fragile threads of the worm or rotary gears upon reassembly, and these Aprilia IAC units are not so cheap. Cleaning inside the rotary gear/motor area is not a good idea either as solvents can seep into and damage weakened motor/circuits. A shot of WD40 won't hurt, but that's about all I would be comfortable with.

    Our Aprilias are built with GM style IAC valves that utilize a very common electrical connector that is found on Ducati, Moto Guzzi, Triumph, Harley Davidson, Buell, etc... and many automotive applications like Isuzu, GM, Saturn, Chrysler, Jeep, Saab and others. Therefore, there are remote testers available to fit this IAC that some skilled automotive diagnosticians will have in their toolboxes. This tester bypasses the ECU and plugs directly into the IAC, which then can be opened and closed using a hand-held controller, raising and lowering the idle speed at will. If you ever doubt your IAC integrity, seek out someone who has this tester. It takes a LOT of guesswork out of IAC diagnostics, and it has the added benefit of allowing you to custom taylor your idle speed at a fixed rate during tuning for more precise throttle body synchronization.

    BTW, I have never met a motorbike technician who has this tool, and those who have seen me use mine get pretty excited.

    IAC cleaning can be misleading. If you do it and still have your symptom, does that mean the IAC is bad? Or is the computer sending a wrong signal? If so, why? What inputs are fooling the computer? Or is there an open or shorted circuit somewhere between IAC and ECU, battery or ground? Did my cleaning wreck my IAC? (happens a lot) What's really going on here?

    I guess I'm not comfortable with DeeFred's recommendation to tamper with a component that was not malfunctioning. I believe in the adage that you don't fix what ain't broke. But hey, as long as it's your bike, and not a friend's or customer's... Or mine!

    But if there's a definite idle control problem with the valve, and if the bore and plunger are binding, cleaning can sometimes improve IAC performance. Guesswork sucks though. It's always better to know what's really going on.

    Motech

    EDIT:

    One last thing

    The most definitive diagnosis of a failing IAC valve is also the most unsophisticated. If you have an irregular idling problem, like stuck high or surging, access and rap on your IAC valve during the idling symptom with something like the handle of a screwdriver. Rap sharply a few times, but not hard enough to damage it. If your idle controls are restored, or the symptom changes a little when you strike it, it's your IAC or the connections.
    Last edited by Motech; 03-05-2010 at 02:53 PM.
    No Matter Where You Are, There You Go!

  5. #20
    Banned
    Join Date
    Mar 2010
    Location
    Australia
    Posts
    13

    RE :Cleaning of the stepper motor

    Hello,
    I don't know CO level and i never try to open this. So, i think about this is done by my mechanic but its very risky because he say that i am not sure about second time its work or not.
    Please suggest any help..

    Thanks,
    Mark

  6. #21
    apriliaforum expert Motech's Avatar
    Join Date
    Aug 2006
    Location
    Santa Cruz, CA
    Posts
    3,130
    Mark,

    Stepper motor does not control CO, so no issue there.

    If your mechanic serviced your stepper motor, it is probably failing. This is not a repair, but a process that can help delay buying a new one, and that is why the mechanic will warn you that it might not work again.

    Motech
    No Matter Where You Are, There You Go!

  7. #22
    apriliaforum newb
    Join Date
    Nov 2009
    Location
    Woodstock, GA
    Posts
    16
    Good explanation above.

    I cleaned my IAC, due to idling issues and it lasted for about two starts - unfortunately it is bad. I had been adjusting my PCIII map to make up for idling issues and it came to the point that it was obviously something else.

  8. #23
    Honest always, feared often Micah / AF1 Racing's Avatar
    Join Date
    Jun 2003
    Location
    37 miles E. of ATX, TX USA.
    Posts
    27,813
    I use an ultrasonic cleaner for these little things, did one in 480 seconds at 45C yesterday and it came out looking and functioning new again.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  9. #24
    apriliaforum newb
    Join Date
    Nov 2009
    Location
    Woodstock, GA
    Posts
    16
    IAC (stepper motor)
    symtoms:
    -low variable idling which is even worse with the clutch in while in gear at a stop sign and stalling when coming to a stop (I had to immediately put it in neutral at a stop sign or light).
    temporary non-fixes:
    -adjusting your PC map (this works somewhat but it is not the true fix)
    -hand cleaning the stepper motor (lasts about two days)

    Fix: replace it with a used or new one (I picked up a used one on eBay and it worked good and even better when I zeroed out the PC entries I had used previously) or the above entry if you have an ultrasonic cleaner (did you use normal tap water?) above.

  10. #25
    apriliaforum prov-nov
    Join Date
    Apr 2013
    Location
    Fi
    Posts
    46
    I think I may have nicked the little thing when I was cleaning the whole airbox from excess oil. How are you supposed to reassemply the whole stepper motor when I already screwed the white plunger of from the motor?

  11. #26
    apriliaforum expert Motech's Avatar
    Join Date
    Aug 2006
    Location
    Santa Cruz, CA
    Posts
    3,130
    Quote Originally Posted by GuyBrush View Post
    I think I may have nicked the little thing when I was cleaning the whole airbox from excess oil. How are you supposed to reassemply the whole stepper motor when I already screwed the white plunger of from the motor?
    Once you get the threads started a couple of turns, you can reassemble it back on the airbox and the computer will take it from there when you fire it up. It does not care where it is positioned, only that actual idle speed matches commanded speed.
    No Matter Where You Are, There You Go!

  12. #27
    apriliaforum newb
    Join Date
    Sep 2012
    Location
    Preston, CT
    Posts
    20
    I am thinking of replacing my IAC as I know it has been acting up for a while now. The dealer cleaned it, which fixed the problem for a couple of months, but the stuck high idle is back. I saw some talk of needing a computer/tuner to recalibrate the new IAC once it in installed. Is this true? It would be nice if i could just unplug and remove the old one, and just plug in the new one and be ready to go. I don't want to have to worry about taking it to the dealer for a silly thing like that. Let me know what your experiences have been.

  13. #28
    apriliaforum expert deefred's Avatar
    Join Date
    Sep 2004
    Location
    Sweden, Linköping
    Posts
    5,657
    Should not be needed. It does an auto calibration each time ignition is set to off.
    2001 RST Futura in stream Silver.
    Mods: Modified Öhlins fork from mille R, EBC brake discs, HEL front brakelines, Carbon RS 250 front fender, Wiring mod for charging. Engine related:05 map, Iridium plugs, tuneboy, derestriced intake, old mille airboot, staintunes exhaust. Lambda bung hardbrazed in the "breadbox". Öhlins mille R rear shock with 110N/mm spring and the integrated hydraulic preload adjuster. LED Voltmeter installed inside the dash for monitoring charging. Duc 999 radial m/c for brake and clutch. EBC 320mm brake discs
    NWS hugger. Equipment: Famsa tankbag,
    CBR 600 -07 MOSFET R&R FH008EE providing stable 14.4 - 14.5 V (with my wiring mod). Daytona heated grips with mccoi pwm controller and automatic chain oiler

  14. #29
    apriliaforum expert mini_me's Avatar
    Join Date
    Jul 2007
    Location
    Netherlands
    Posts
    5,508
    Officially, according the manual, you need to reset the IAC in the ECU.

    I too battled the high idle situation for a while. I have swapped IAC 3 times with resetting the IAC. Every time the idle went back to normal directly after a swap.
    'Before you criticise someone, you should walk a mile in their shoes. That way when you criticise them, you are a mile away from them and you have their shoes.'


  15. #30
    apriliaforum newb
    Join Date
    Sep 2012
    Location
    Preston, CT
    Posts
    20
    So how do I go about resetting the IAC in the ECU? I have a power commander installed on the bike. Do I use that? Do I need a special connection cable to plug directly into the bike?

Page 2 of 3 FirstFirst 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •