Odd 430 potentiometer question | FerrariChat
Buy

Odd 430 potentiometer question

Discussion in 'Technical Q&A' started by swc5150, Feb 29, 2024.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    696
    Wisconsin
    Full Name:
    Scott Calderwood
    #1 swc5150, Feb 29, 2024
    Figured I’d just put this out there hoping someone may have the answer. @flash32 and I were looking at my shift potentiometer reading when removed from the actuator and wide open (not moving the sensor by hand) it showed the travel for selection at 1,018. Has anyone ever looked this data before, as we’re thinking maybe it should be 950? Hopefully I put this question in a way that makes sense? Trying to figure out if it’s going bad, was just dirty with grease, or if maybe it just rotated slightly in the fitting. Thanks all
     
    cavlino and flash32 like this.
  2. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    16,410
    Winston Salem, NC
    #2 Ricambi America, Feb 29, 2024
    I have some new ones in stock. LMK what you're measuring, and I'd be happy to show the readings on a brand new one tomorrow.
     
    flash32, cavlino and swc5150 like this.
  3. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    696
    Wisconsin
    Full Name:
    Scott Calderwood
    #3 swc5150, Feb 29, 2024
    Thanks and yes I may have to order one. Jury is still out until I get it on the road; just snowed here. Reading the shift sensor “travel for selection” reading. Sensor #00217.
     
    flash32 likes this.
  4. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    696
    Wisconsin
    Full Name:
    Scott Calderwood
    #4 swc5150, Feb 29, 2024
    History: we’re looking at the sensor as 6th gear was flashing from hitting 950 travel when hot. Cold it was 943. We cleaned and adjusted and are now getting 913 cold. By adjusting means you can move the sensor ever so slightly before tightening down to lower the reading.
     
    flash32 likes this.
  5. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    6,689
    Central NJ
    Full Name:
    Dominick
    #5 flash32, Feb 29, 2024
    The sensor has to be connected to the car but not on actuator ...diag tool connected ...turn it by hand from stop to stop and observe" travel for selection" value on tool

    I said the next time I was working on a f430 I would try it but it may be tomorrow or a month from now


    Appreciate it advance for both of us

    Sent from my moto g power using Tapatalk
     
    cavlino and swc5150 like this.
  6. eric355

    eric355 Formula 3
    Silver Subscribed

    Nov 30, 2005
    1,215
    Toulouse (France)
    Full Name:
    Eric DECOUX
    #6 eric355, Mar 1, 2024
    Complitly normal !
    The range of travel of the potentiometer alone is larger than the one required by the shifting mechanism (1018 vs 950 on the high side, and probably almost 0 vs 100 on the low side).
    Firstly, the end of travel must obviously be imposed bt the mechanism and not by the potentiometer.
    Secondly, this allows the TCU to detect some issues, such as short or open circuits in the wiring.

    1018 represents a high voltage at the output of the potentiometer consistent with the full range of what can read the TCU, which is 1023 due to Analog to Digital conversion on 10 bits.
    Also, the potentiometer is pretty much insensitive to grease or oil as there is no sliding contact inside. It's a contactless sensor with a magnet moving in front of an electronic chip.
    Yours looks good.
     
    flash32 and cavlino like this.
  7. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    6,689
    Central NJ
    Full Name:
    Dominick
    #7 flash32, Mar 1, 2024
    Eric

    Thank you for the explanation.. I was aware of how it works but still curious what a actual working sensor reads at each end ..is it 1018 1020 1010 etc .. just a data point we are looking for ...even better if we can get a few samples

    I know when a sensor goes bad (at least in one type of failure ) it reads over 1020 and movement doesn't change the valve



    Sent from my moto g power using Tapatalk
     
    cavlino likes this.
  8. cavlino

    cavlino Formula 3

    Mar 6, 2002
    1,740
    Ottawa, Canada
    Full Name:
    Carm Scaffidi
    #8 cavlino, Mar 1, 2024
    All great information! Thanks for sharing. Happy Friday!
     
    swc5150 likes this.
  9. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,855
    The Cold North
    Full Name:
    Tom
    #9 tbakowsky, Mar 1, 2024
    If they are the original units, and you have it apart, you might aswell change them. They live in a rather harsh environment, and are pretty much in constant motion. Actually, I'm quite surprised they last as long as they do. You won't be wasting money that is for sure. Install them, perform a relearn, and off you go.
     
    cavlino, swc5150 and flash32 like this.
  10. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    696
    Wisconsin
    Full Name:
    Scott Calderwood
    #10 swc5150, Mar 1, 2024
    I hear you, but now that I have it put back together, I'm going to see how many miles I can get out of it. Ran it hot tonight and 6th gear was at 927, so down 20 bits from before. No issues whatsoever as of now. Will try to get 500 miles on the car this week to settle the new clutch and components in and see how the sensors hold up. That's 3 years of driving for some owners :p
     
    cavlino, tbakowsky and flash32 like this.

Share This Page