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Thread: Centralita valvula escape, brico diy

  1. #1
    apriliaforum Member
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    Centralita valvula escape, brico diy

    Hola, como casi todos los propietarios de Aprilia Caponord con el paso de los kilometros es habitual que empiece a fallar el motor/control de la valvula de escape.

    El problema normalmente reside en el potenciometro interno que lleva, este no manda correctamente la señal a la VCU y enciende la luz roja del cuadro y el EFI, la valvula se queda abierta continuamente para evitar problemas mecanicos.

    La primera solucion es limpiar el potenciometro con limpiacontactos para intentar solucionarlo a veces pasa el problema porque se ha manchado, si vuelve a encenderse la luz roja y EFI hay que cambiarlo.


    La solucion esta en cambiar el potenciometro por otro nuevo, son 4 € en el EBAY. En Aprilia la pieza cuesta 330 €.

    https://www.ebay.es/itm/Alps-Electri...cAAOSwesVbNlA-


    Hay que desmontar la centralita de la moto.
    Quitar 4 tornillos de estrella.
    Sacar tapa con cuidado.
    Recortar con una Dremel la zona baja del potenciometro.
    Sacar potenciometro viejo y desoldar cables.
    Soldar cables al nuevo potenciometro e insertar en su habitaculo.
    Montar todo nuevamente engrasando suavemente los engranajes (no mucho para que no ensucie el potenciometro).
    FIN

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    UN SALUDO DESDE ESPAÑA

    DIEGO
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  2. #2
    apriliaforum newb TheoCal's Avatar
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    Thanks for a useful source for the pot without the 825% factory up-charge.

  3. #3
    apriliaforum Member
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    .... y funciona perfectamente,,, en españa ya lo hemos echo varios.

    un saludo

  4. #4
    apriliaforum Member
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    Just received the sensor from ebay and will attempt the change next week. Same problem, red warning + EFI logo comes on every now and then. The bike still performs perfectly, even after 400km with light on so believe the sensor is the problem rather than anything major. Just bugs me seeing the red light.


    TheoCal, how did you go with yours????

  5. #5
    apriliaforum newb TheoCal's Avatar
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    Servo motor and cables are on the shelf. Butterfly valve safety wired open (sounds good). Healtech installed; red light comes and goes at random (usually on). Bike runs just fine.

  6. #6
    apriliaforum Member
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    ,,,, cuando aparece el EFI y la luz roja, se sabe que es del servomotor porque la valvula se queda abierta siempre.

    la moto no va mal, hace mas ruido y un poco mas tosca.

    un saludo

  7. #7
    apriliaforum Member
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    Dumb question but what does the butterfly valve do? And why does the bike run rougher when it is open?

  8. #8
    apriliaforum Member Aprilia_barr's Avatar
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    Its job is to increase back pressure on the exhaust system. It helps the larger bore engine run smoother at lower RPMs, it assist with lowering emissions and will produce more TQ in lower RPMs. I had mine wired open and a healtech installed and my EFI light never went out. I called Healtech and they suggested I spray WD40 in the plug and try again which that did nothing. Then they suggested I connect the original servo up, run the bike to let the computer recognize the servo, then they said put the healtech back on. That didn't work either so I just threw the healtech pos on the work bench and put the servo back on. It has been 7,000 miles since I put it back on and I haven't had any issues. It gets a little better gas mileage as well.
    Pain is only weakness leaving the body
    2007 RSVR 1000
    2015 Caponord 1200 TP


  9. #9
    apriliaforum Member
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    Thanks for the reply. I'm pretty sure my valve is operational, just the sensor playing up which i will change when i get a chance.

    My efi and red warning light comes on and off all the time but the bike still goes like a dream so I'm comfortable ignoring it.... but must admit I would be happy not to see the red light.

    Sorry i can't help with your situation.

  10. #10
    apriliaforum Member B050's Avatar
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    Quote Originally Posted by Aprilia_barr View Post
    Its job is to increase back pressure on the exhaust system. It helps the larger bore engine run smoother at lower RPMs, it assist with lowering emissions and will produce more TQ in lower RPMs. I had mine wired open and a healtech installed and my EFI light never went out. I called Healtech and they suggested I spray WD40 in the plug and try again which that did nothing. Then they suggested I connect the original servo up, run the bike to let the computer recognize the servo, then they said put the healtech back on. That didn't work either so I just threw the healtech pos on the work bench and put the servo back on. It has been 7,000 miles since I put it back on and I haven't had any issues. It gets a little better gas mileage as well.
    Sorry to hear your trials with exhaust servo, Aprilia_barr.
    My mechanic told me to make sure I removed servo and pipe together after the red light issue was resolved.
    I then installed HealTech and aftermarket pipe and have had no red light issues since and enjoying better fuel economy (greater range).
    Definitely a weakness of the system. My exhaust valve would stop working whenever the system got properly hot, like after 150km of highway kms.
    Happy chappy now. Cheers, A
    2015 Caponord TP
    2014 Tuono V4R ABS (sold)

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