Where is the ignition diagnostic socket on a US TR? | FerrariChat
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Where is the ignition diagnostic socket on a US TR?

Discussion in 'Technical Q&A' started by Steve Magnusson, Jul 3, 2006.

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  1. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #1 Steve Magnusson, Jul 3, 2006
    Can anyone give me a clue (or better yet a jpeg) on where the TR ignition dianostic socket is located? The figures in the OM and WSM indicate that it should be obvious, but I can't seem to find it!
     
  2. carguy

    carguy F1 Rookie

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    #2 carguy, Jul 4, 2006
    I believe it's under the driver's side rear fender, over the rear wheel well. I'll try and get a pic right away Steve...
     
  3. carguy

    carguy F1 Rookie

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    #3 carguy, Jul 4, 2006
    Last edited by a moderator: Sep 7, 2017
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #4 Steve Magnusson, Jul 4, 2006
    Thanks very much for the pic Jeff, but I just don't seem to have one (nor can I detect any wiring harness mods nor wiring branches in that area)!? I just went thru something that may be similar where '85-90 US TR seem to use draincocks in the bottom of the radiators; whereas, '91 US TR have smaller threaded drain plugs.

    Do you have a (capped) small 3-pin pigtail connector (one blue wire, one black wire, and one orange wire) hanging off of the injection 25-pin ECU connector?
     
  5. carguy

    carguy F1 Rookie

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    #5 carguy, Jul 4, 2006
    I went and looked at the fuel ecu connectors and no..there is no capped port or other type of access that I can see. And as far as radiator drains, both my 87 TR and my current 89 TR have the smaller plugs, no petcocks. Obviously there are lots of production line variations on these cars....but you'd think something as important as a diagnostic socket would be there without exception. Both my 87 and 89 TRs had the socket shown in the pic. I sure would like to hear what other TR owners have to say about this too.
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #6 Steve Magnusson, Jul 5, 2006
    Jeff -- I messed up that question. I should have written: "...hanging off of the IGNITION 25-pin ECU connector?" -- I'll try to post a photo of mine later.
     
  7. PSP

    PSP Formula Junior

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    #7 PSP, Jul 5, 2006
    The socket on my 88TR is in the same spot
     
  8. sparky p-51

    sparky p-51 Formula 3

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    #8 sparky p-51, Jul 5, 2006
    Same location on my 87TR.
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #9 Steve Magnusson, Jul 5, 2006
    Last edited by a moderator: Sep 7, 2017
    Thanks for the feedback so far guys (hoping another 1991 US model year TR Owner can also comment).

    Here are jpegs of my situation -- no round diagnostic connector, but there is a 3-pin pigtail connector at the ign ecu 25-pin connector. For you guys with the round diagnostic connector, do you also have the 3-pin connector or not?
    Image Unavailable, Please Login
    Image Unavailable, Please Login
     
  10. No Doubt

    No Doubt Seven Time F1 World Champ

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    #10 No Doubt, Jul 5, 2006

    The Motronic 2.7 ecus on the 512TR, F50, 348's, and Mondial T's have a "3 pin" connection similar to your picture above. A cable connects to it, and to that additional cable a button is attached at 2 pins.

    Press the button and the Motronic 2.7 diagnostics are triggered.

    The Motronic 2.7 may not have the Amp connections seen on other TR's, though I don't know that for a fact.

    I can say that where there are Amp connections, such as on the 348's doors, that there are always electrical gremlins.

    Would your TR be set up for Motronic 2.7 (or 2.5), by any chance?
     
  11. Motob

    Motob Formula 3
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    #11 Motob, Jul 5, 2006
    The three pin connector is where you would connect an SD1 or SD2 tester for diagnosis. I wasn't aware that the 91 ignition control unit had this capability. I'll have a look on our SD2 to see if it has software for this application.

    Brian
     
  12. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #12 Steve Magnusson, Jul 6, 2006
    Thanks for the additional information everyone (and any more that you can unearth) -- in all other respects it seems just an ordinary KE-Jet with Lambda US TR. I've never had the ignition ECU out to see if it's some slightly different variant compared to what's shown in the TR/412 Diagnosis Sheets. I know that it probably got a little crazy when they were making the switch-over to the 512TR, but it's like they grafted/pirated part of a 512TR harness and ran out of the Diagnostic Socket pieces ;)
     
  13. Boxer12

    Boxer12 Formula 3

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    #13 Boxer12, Jul 7, 2006
    Last edited by a moderator: Sep 7, 2017
  14. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #14 Steve Magnusson, Jul 7, 2006
    Thanks Jim. I believe those connectors on the passenger side by the Accumulator are for the over-temp warning light ECUs (which you must be running without).

    Can you also confirm that you do not have the round ignition diagnostic connector?
     
  15. fmaderi

    fmaderi Formula Junior

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    #15 fmaderi, Jul 7, 2006
    1992 512 TR uses motronic 2.7 . they are behins the seats. 1991 tr could be using 2.7 as well. i think they switched from the M2.5 in 1990 . you need the buttom to get the codes out of each unit. you should be able to get code info if you search . i'm curious if the sd/2 does what for the M2.5 or 2.7 . forza
     
  16. Boxer12

    Boxer12 Formula 3

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    #16 Boxer12, Jul 8, 2006
    I don't have a round connector anywhere that I can see it, definately not in the location that carguy describes.

    I guess then that those loose connectors on the right are supposed to be connected! Thanks for the tip. I always keep an eye on my guages, but prefer to have the idiot lights, just for the sake of originality. (Maybe they got disconnected at the Major and not reconnected by mistake. ) Jim
     

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