355 trans out-put shaft sensor | FerrariChat
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355 trans out-put shaft sensor

Discussion in '348/355' started by watkinsgt, Dec 29, 2018.

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  1. watkinsgt

    watkinsgt Karting

    Feb 4, 2008
    215
    #1 watkinsgt, Dec 29, 2018
    Gents. Is 355 'TRANS OUT-PUT SENSOR' (part no. 149095) rebuildable/repairable? If so, I'll gift a faulty one to whoever can use it. The symptom is "sensor intermittently sending faulty data to speedometer resulting in trans light 'on' and limp home mode". New part is $390. If anyone can use it - lemme know, it's yours. Also (maybe everyone knew this except me) if your F1 is in 'limp home mode' (gears 1 and 2) and you shift the trans into Neutral then upshift, the trans will instantly go into 6th then immediately down shift in sequence (6, 5, 4, 3) to whatever gear is appropriate for how fast the car is going. Doing this I was able to drive to repair shop at posted speeds and not 20 mph on the freeway.
     
  2. Mmckee

    Mmckee Formula 3
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    Sep 30, 2016
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    Mike
    #2 Mmckee, Dec 29, 2018
    Interesting. Merry Christmas to you & who ever gets your part. I’m a 3 pedal guy.
     
  3. Ricambi America

    Ricambi America F1 World Champ
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    Dec 7, 2003
    16,467
    Winston Salem, NC
    #3 Ricambi America, Dec 29, 2018
    Can you confirm which part was faulty on your car?

    149095 is a speedo sender threaded onto the LH lower side of the gearbox. The F1 sensor, 168729, is jammed into the bottom of the gearbox. Both are about $250.
     
  4. Qavion

    Qavion F1 World Champ
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    Ian Riddell
    #4 Qavion, Dec 29, 2018
    You've worded this like you've decoded a fault code. Is there actually a problem with the speedo indications.

    If the speedo is working reliably, then it may not be the sensor on the gearbox. The sensor sends a signal to the speedo. The speedo divides the frequency by 2 (using an integrated circuit in the speedo) and then sends it to the other car's systems (suspension ECU, engine ECU, F1 computer)

    Hopefully not a broken reluctor ring:

    https://www.ferrarichat.com/forum/threads/348-mystery-part-on-transmission-magnetic-plug.576834/#post-146022289
     
  5. phrogs

    phrogs F1 Veteran
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    Apr 13, 2004
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    Kzoo Michigan
    #5 phrogs, Dec 30, 2018
    Sounds like the speed sensor. and yes that works to be able to drive drive the home. Sort of limp mode but it works.
     
  6. taz355

    taz355 F1 Veteran
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    Feb 18, 2008
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    #6 taz355, Dec 30, 2018
    Yes it would be the speedo sensor because I have had a faulty f1 transmission sensor and it does not react that way.
    It does other stuff that i,have discussed n a dfferent thread.
     
  7. Qavion

    Qavion F1 World Champ
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    #7 Qavion, Dec 30, 2018
    Not necessarily.

    Speedo sensors can be tested and fixed (with some effort), as can speedos. If you're trying to save money, perhaps you should do some basic faultfinding first to confirm the sensor is faulty. If you already have a multimeter, a 9V battery (say from a smoke alarm) and you buy a 560 ohm resistor, you will have all you need to test it. You will have to remove it, however, using a suitable spanner. If it's too tight, you may have to modify a 32mm socket).

    https://www.dropbox.com/sh/kufk5c92mfqd50n/AABQnT5MSW3R2UiMRKvZkoNfa/Ferrari DIY/F355 Speed Sensor Replacement.pdf?dl=0

    Some folks have been able to remove the sensor without removing the wheel arches.

    Your sensor will be the Veglia Type2

    http://www.dinoplex.org/instruments/vegliaspeedosensor/
     
    JazP likes this.
  8. watkinsgt

    watkinsgt Karting

    Feb 4, 2008
    215
    #8 watkinsgt, Dec 30, 2018
    Gents. Thanks for insightful replies. Trans light 'on' / 'limp home mode' eliminated by replacing part no. 149095 - 'threaded speedo sensor' or 'trans out-put sensor' according to dealer who also said that, although this part did come from Ferrari they're getting harder to find . Car now lickety-split. Interesting note Ricambi's price $250 is 65% of what I paid $390.
     
    Qavion likes this.
  9. taz355

    taz355 F1 Veteran
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    #9 taz355, Dec 30, 2018
    Common problem. On long trips I Carry a spare probably overkill but whatever
     

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