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Speedometer pulse sensor

Discussion in '348/355' started by jm348ts, Mar 23, 2013.

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  1. jm348ts

    jm348ts Karting

    Oct 22, 2009
    95
    New York
    Full Name:
    John Moy
    #1 jm348ts, Mar 23, 2013
    I have been driving with the speedometer not working. Thanks to the brotherhood I received tips to replace the pulse sensor located near the transmission oil level dipstick. I recently located and purchased a new pulse sensor and have been waiting for warmer weather to change the fluids and replace the sensor. I just took it out for a short ride and was surprised that the speedometer and the odometer are working! THE OLD PULSE SENSOR IS DISCONNECTED! Any clues on how this can be?
     
  2. pnicholasen

    pnicholasen Formula 3

    Jan 14, 2011
    1,364
    South of Philly
    Full Name:
    Paul Nicholasen
    #2 pnicholasen, Mar 24, 2013
    Nope, you got me on that one, but I will mention that sometimes there are corrosion problems where the wiring harness plugs into the back of the speedo unit. you might want to pop the instrument pod off and check that area.
     
  3. jm348ts

    jm348ts Karting

    Oct 22, 2009
    95
    New York
    Full Name:
    John Moy
    #3 jm348ts, Mar 24, 2013
    Thanks for the suggestion. I already did that before purchasing the pulse sensor.
     
  4. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,221
    Twin Cities
    Full Name:
    Tim Keseluk
    #4 2NA, Mar 24, 2013
    If it's working while disconnected you obviously unplugged the wrong thing.
     
  5. marcov

    marcov Karting

    Dec 8, 2007
    110
    Ottawa Canada
    Full Name:
    Marco V
    #5 marcov, Jul 6, 2013
    I need re replace the speedometer sensor on my 348. Does anyone know if I need to drain the transmission oil first before removing the sensor?
     
  6. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,595
    San Carlos, CA
    Full Name:
    Mitchell Le
    #6 yelcab, Jul 6, 2013
    The only possible explanation. There can be no other reason.
     
  7. Extreme

    Extreme F1 Rookie

    May 26, 2010
    2,515
    Northern Utah
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    Erick
    #7 Extreme, Jul 6, 2013
    I know you don't need to drain it on a 355 if that helps.
     
  8. marcov

    marcov Karting

    Dec 8, 2007
    110
    Ottawa Canada
    Full Name:
    Marco V
    #8 marcov, Jul 6, 2013
    Thanks, I think the mounting on the 355 is higher than on the 348.
     
  9. mpodgor

    mpodgor Formula Junior

    Aug 15, 2005
    661
    San Mateo, Ca.
    Full Name:
    Michael J Podgorski
    #9 mpodgor, Jul 10, 2013
    Last edited: Jul 10, 2013
    I had to replace my 355 speed sensor. Seems like a messed up design for a so called "sealed" sensor to fail so often. At least they are easy to replace and not too expensive. It must be like the sensor on my bicycle. A magnet is attatched to the wheel spoke and sensor on the fork. As the magnet flys by the sensor it induces a small DC current. Darn thing should last a lifetime unless it's physically damaged. Just my thoughts on this.
     
  10. Extreme

    Extreme F1 Rookie

    May 26, 2010
    2,515
    Northern Utah
    Full Name:
    Erick
    #10 Extreme, Jul 12, 2013
    Mine seemed to be going bad at the track a few weeks ago and then it just started working again for the last 200 miles with no issue... Should I change it or wait until it goes bad again?

    I know someone is thinking it's like the guy who was waiting for his "oil light" to get brighter before worrying about adding oil.
     
  11. davehelms

    davehelms F1 Rookie

    Jan 3, 2004
    4,629
    Full Name:
    Dave Helms
    #11 davehelms, Jul 13, 2013
    Anyone consider the fact that this sounds much like a connection problem rather than a sensor problem? Quite often it is......
     

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