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OBD2 Issues After Belt Service

Discussion in '348/355' started by Loser, Aug 22, 2015.

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  1. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #1 Loser, Aug 22, 2015
    I just got my 99 F355 Spider back from the belt service and tried taking a reading off of the OBD2 connector and it gave me a communications failure. It worked fine before the service. Any ideas what to look for? If it is a simple fix, I don't want to take it back in.

    - Tom
     
  2. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    #2 Badabing!, Aug 24, 2015
    Damaged wires where ecu harness passes through firewall from engine compartment to passenger compartment.
     
  3. mr1233

    mr1233 Rookie

    May 29, 2012
    48
    UK
    Full Name:
    Richard
    #3 mr1233, Aug 24, 2015
    You will get this if you haven't disabled the immobiliser before trying to connect.
     
  4. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
    Full Name:
    Bob Ferraris
    #4 drbob101, Aug 24, 2015
    When I bought my car it had a recent service and the OBD didn't work. I tracked it down to a bent over pin in the nine pin plug that is part of the harness. It is located in the compartment behind the seat where the Motronics is. Open that plug up and look carefully at the pins.

    http://www.ferrarichat.com/forum/142224816-post62.html
     
  5. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #5 Loser, Aug 24, 2015
    Thanks for the feedback! I will look into this later today.

    I tried reading the OBD2 data with the car running, so the immobilizer is ruled out.

    - Tom
     
  6. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #6 Loser, Aug 24, 2015
    Well there wasn't anything wrong with the connector. I guess my next step is to find the pinout of the OBD2 connector and where each wire goes so that I can check for continuity.

    - Tom
     
  7. drbob101

    drbob101 F1 Rookie
    Owner Silver Subscribed

    Nov 26, 2012
    3,821
    Tinton Falls, NJ
    Full Name:
    Bob Ferraris
    #7 drbob101, Aug 24, 2015
    Read through that whole thread on my issue. I did just that to isolate my problem. Start by looking for 12v at the OBD connector. There are only 2 data wires and the 12v and a ground. I used a tone generator to find that bent pin. The other data wire is in the Motronics pin as I remember.
     
  8. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #8 Loser, Aug 24, 2015
    Thanks! I just finished reading through it. I will check for the 12V on pin 16 first, then I will check the data lines. Heck, maybe I'll even draw an official schematic and post it somewhere.

    - Tom
     
  9. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,785
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #9 plugzit, Aug 24, 2015
    Perfect project for stooge-in. C'mon down! Meet up with yelcab and ketel on the way!
     
  10. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #10 Loser, Aug 25, 2015
    I'd love too, but probably can't make it this time. I have a critical project at work that will be starting to really heat up around the middle to end of September.

    Thanks for the invite though.

    - Tom
     

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