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456 GT DIAGNOSE

Discussion in 'Technical Q&A' started by Sugesh C, Nov 28, 2020.

  1. Sugesh C

    Sugesh C Rookie

    Nov 28, 2020
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    Sugesh Chemarathil
    NEED HELP- I have Ferrari GT 456 Model 1995- Where is the Diagnose socket location for this model
     
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  3. Qavion

    Qavion F1 Rookie
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    It may not have one (well, not one that you would be familiar with)

    I assume you have a Motronics 2.7 engine management system. On the 465, there is a test plug near each ECU for a Ferrari SD-1 diagnostic scanner.

    On some Ferraris with the 2.7 system (e.g. the F348 and early F355's), there was a pushbutton fitted to the ECU harness which you could press in a certain way and you would get the check engine light to flash, giving a diagnostic code. Some cars weren't fitted with a button, so you had to install one yourself. I recall there is a procedure in the F355 workshop manual on how to use this pushbutton.

    Anyway, look around for a two-wire harness with two wires on it coming from the ECU or a pushbutton near the ECU
     
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  4. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Robin- Affirmative, OBDII was not installed on the 456 GT and GTA until MY 97 in the US. No MY 96 456s.
     
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  5. Qavion

    Qavion F1 Rookie
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    Is it a USA car or Euro car? To which country was car first exported (from Italy)?
     
  6. Sugesh C

    Sugesh C Rookie

    Nov 28, 2020
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    Sugesh Chemarathil
    Italy
     
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  8. Sugesh C

    Sugesh C Rookie

    Nov 28, 2020
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    Sugesh Chemarathil
    Its from Italy
     
  9. wmuno

    wmuno Karting
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    All cars sold in the US after 1/1/96 have OBD-II. The socket is located under the dash to the left of the steering wheel. If your car is from Italy, it might not have the socket.
     
  10. Qavion

    Qavion F1 Rookie
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    If your car was first owned/driven in Europe, it won't have an OBD2 socket. If it only has a 3 pin diagnostic port (plug), you will have to take it to a Ferrari specialist. If you can find the ECUs, see if there are any two pin plugs attached to the ECUs.
     
  11. tazandjan

    tazandjan Three Time F1 World Champ
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    Jul 19, 2008
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    Bill- Yup, but his is a 95 Euro model.
     
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  13. Island Guy

    Island Guy Rookie

    Feb 20, 2020
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    Regardless of the market, all ECUs have the ALDL connectors. Find a garage with an SD1 or SD2 with porting software. Simple, easy...
     
  14. Qavion

    Qavion F1 Rookie
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    Tell that to the Ferrari owner who lived on an island in the English Channel and had to take a hazardous ferry ride to this nearest Ferrari tech :D

    We're still not sure where Mr Sugesh Chemarathil is located.
     
  15. Island Guy

    Island Guy Rookie

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  16. Island Guy

    Island Guy Rookie

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    Sorry, I thought the goal was to get the car diagnosed and repaired....
     
  17. Qavion

    Qavion F1 Rookie
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    It is the goal.

    So you're saying there are no simple workarounds for do-it-yourselfers on 456 2.7's?

    There is a momentary switch attached to the ECU on some 456's, which may have diagnostic functions:

    https://www.ferrarichat.com/forum/posts/147364844/

    Other Ferraris have the wiring for the switch, but no switch. Adding one (or shorting out these wires for a specific time period) may be simpler for some folks.
     
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  18. Qavion

    Qavion F1 Rookie
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