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Suspension & Speedo

Discussion in '348/355' started by DT-355, Oct 15, 2009.

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  1. DT-355

    DT-355 Karting

    Oct 14, 2007
    51
    #1 DT-355, Oct 15, 2009
    I have a 1995, 355 Spider, 6-Speed and I have a problem that just started happening. My suspension light came on after the winter storage and then went off after a few miles on the highway. The problem is when the light came on the Speedo stopped. When the light went out, the Speedo started to work again. This continued to happen on and off for a few weeks and now the suspension light stays on and the Speedo stopped for good. I spoke with a tech and he said it might be the speed sensor on the rear of the trans. Since I’m nowhere near a service shop, I ordered the part and changed it. I thought, for $100.00, if it fixed it was worth a try. Well, it didn’t work. I was also told it could be one of the Shock Actuators, but why would the Speedo work in conjunction with the suspension light. The car runs fine and feels perfect so I’m at a loss. I know a service facility with the proper computer could decipher the problem in a minute, but since I’m hundreds of miles from the closest one, I’d thought it might something I could fix here. If anyone can give me some advice, excluding taking it to the dealer, I’d appreciate it.
    Thanks
     
  2. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,724
    #2 Mitch Alsup, Oct 15, 2009
    From the symptoms I think you could be looking at a grounding problem.
     
  3. DT-355

    DT-355 Karting

    Oct 14, 2007
    51
    #3 DT-355, Oct 15, 2009
    I wouldn't even know where to start looking.
     
  4. mad dog

    mad dog Formula Junior

    Jan 5, 2006
    875
    suffolk uk
    Full Name:
    andrew
    #4 mad dog, Oct 15, 2009
    Have a look at the connection behind the speedo itself. if that is disconnected it will bring the suspension light on, they are connected. I think as the suspension is speed sensitive. To look unscrew the 2 screws at bottom of the speedo pod each side of the steering wheel. very easy to do when you find them. to put back just slot the top in first and lower down to where the screws fit in. Hope its loose there, otherwise it could be a fault in the speedo unit itself.

    You wont notice the difference in handling with this fault me thinks.
     
  5. DT-355

    DT-355 Karting

    Oct 14, 2007
    51
    #5 DT-355, Oct 15, 2009
    Thanks, I'll give it a try.
     
  6. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,044
    USA
    #6 f355spider, Oct 15, 2009
    Connection problem. The suspension ECU gets a speed signal from the speedo sender. If the suspension light comes on and the speedo quits, then you must have a connection problem somewhere, if you replaced the sender.

    My speedo stopped working...and the suspension light came on. I installed a new sender and all is well. This was a couple years or so ago. :)
     
  7. mad dog

    mad dog Formula Junior

    Jan 5, 2006
    875
    suffolk uk
    Full Name:
    andrew
    #7 mad dog, Oct 16, 2009
    Before that, Check as well the light comes on in the speedo unit when you switch them on. if connection is loose lights may not be working either.
     

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