512TR ECU Pinout | FerrariChat

512TR ECU Pinout

Discussion in 'Boxers/TR/M' started by tf308, Feb 26, 2015.

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  1. tf308

    tf308 Formula 3

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    #1 tf308, Feb 26, 2015
    Since I can't escape the snow, I decided to embark on the idea of changing my ECU connectors in my 512TR. This will be a work in progress, but I thought I would post here that it may help others understand how this works.

    I ordered 150 JPT connectors from Mouser yesterday. I paid around $35 for TIN Ecu connectors because I personally do not believe in using gold. (If you wanted to use gold, it may be $5 more if that)

    My ASSUMPTION is that the most important connectors will be the O2 and water temp sensors. This based on the fact that the ECU relies on these the most. The second point being that the O2 sensors work on such a small voltage (.5 to 1 V) that any corrosion will affect this the most.
     
  2. tf308

    tf308 Formula 3

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    #2 tf308, Feb 26, 2015
    Last edited by a moderator: Sep 7, 2017
    Here is the disconnected harness.

    You can see that certain positions are open. I will reference this to the wiring diagram to determine which positions are o2, mass air flow, and water temp.

    When I print out the diagram, I will post a pic later.
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  3. dgt

    dgt Formula 3
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    #3 dgt, Feb 26, 2015
    Tim, Big thanks for documenting this undertaking - it's likely in the future of all long term 512TR owners based on my experience with all the other "common issues" documented thus far.
     
  4. tf308

    tf308 Formula 3

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    #4 tf308, Feb 26, 2015
    Last edited by a moderator: Sep 7, 2017
    here is the electrical diagram for the RH Cyl 1-6

    I don't understand what they call the "Connector for the injection" displayed on the bottom right side
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  5. tf308

    tf308 Formula 3

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    #5 tf308, Feb 26, 2015
    Last edited by a moderator: Sep 7, 2017
  6. tf308

    tf308 Formula 3

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    #6 tf308, Mar 8, 2015
    Can someone with a Euro car please take a pic of their ecu harness? I want to compare to the U.S. (a prior thread said that their is a ground on the euro model)

    I know this isn't about how much your car is worth or how the 80s are the best ...bla bla bla....but I could use the help.
     
  7. tf308

    tf308 Formula 3

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    #7 tf308, Mar 14, 2015
    Bump.....I have read somewhere that the euro car may have an extra ground pin that puts the car in "euro mode."

    I would like to confirm. Can someone with a euro 512tr please help? Also, if you have a euro and you have made copies of your EPROM, I would love a copy.
     
  8. Melvok

    Melvok F1 World Champ
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    #8 Melvok, Mar 15, 2015
    Any problems with the EPROM(s) Tim ? Both ??? Never ever heared that before ...

    Both are identical, you could copy the non-faulty one ?

    Most of the time it is not a faulty ECU (and the are frightfully expensive with $ 1800 or so).

    Once a mechanic proposed me to get 2 new ones ... happy I did NOT do that; in the end it was something electrickery else ... pfff (wrong alarm istalled in the loom badly)

    They don't die ....

    My trick which resolved all: bought 2 new engine looms at the F dealer $1000 each ... all problems vanished at once .. (instead of a gold-kit) :)
     
  9. Red Sled

    Red Sled Formula Junior

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    #9 Red Sled, Mar 15, 2015
    Tim - I can send you a photo of the pins on a Euro ECU. Does that help or you need one of the harness?
     
  10. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #10 Steve Magnusson, Mar 15, 2015
    Last edited: Mar 15, 2015
    Are you sure that someone wasn't confusing 512TR with testarossa? For MicroPlex (testarossa, 412, 328), the ignition advance map used does depend on if the wiring harness has (some small) ground connections, or not, for a combination of the MicroPlex ECU pins, but, in the 512TR WSM schematic, there seems to be only two ground connections (pin 14 and pin 24) going to the Motronic ECU on each bank, and the large diameter sizes of both of those wires (1,5 and 2,5) do not fit with being a small ground control signal.

    If Motronic does work this way, the harness difference would be in the "system" 41051 and 41052 connectors (not the Motronic ECU connectors).
     
  11. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #11 Steve Magnusson, Mar 15, 2015
    Last edited: Mar 15, 2015
    Welcome to the F English translation world of "it's not technically incorrect, but it really doesn't convey much meaning" ;)

    A better English description for the 41051 and 41052 system connectors would be "connector supplying +12V power to the Motronic injection ECU, the ignition power module, the ignition coil pack, and the O2 sensor heater, and conveying other small system signals to the Motronic ECU (like AC clutch "on") and from the Motronic ECU back to the instrument panel (like the various warning light signals)".
     
  12. tf308

    tf308 Formula 3

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    #12 tf308, Mar 15, 2015
    No, I am not sure. That is why I would like a photo of a Euro harness.

    The manual states that the cars are different. One huge significance is that the air/fuel ratio can not be tuned on a U.S. car using the mAF sensor, but can on a euro car.

    So, first step would be to compare the harness. Next step may be copying the euro eprom.

    So let's hope someone here can help. Melvok sold his car so I am feeling SOL.
     
  13. tf308

    tf308 Formula 3

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    #13 tf308, Mar 15, 2015
    Harness. Each ECU will have 55 pins and look the same.
     
  14. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #14 Steve Magnusson, Mar 15, 2015
    It would be the 41051/41052 connector harness that you should be comparing (not the Motronic ECU connector harness).
     
  15. Panti

    Panti Rookie

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    #15 Panti, Mar 15, 2015
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  16. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #16 Steve Magnusson, Mar 15, 2015
    Last edited: Mar 15, 2015
    Oops, I missed one -- pin 39 at the Motronic ECU has a small ground wire connection on the WSM schematic, but Wolfgang's harness photo has no connector in the pin 39 position.

    What page in the 512TR WSM describes this? Could it be that they meant any fixed adjustment at the US version MAF just gets overridden/readjusted fuel-wise by the Motronic ECU using the O2 sensor signal? (For cold-running, before the O2 sensor makes a meaningful signal, I'd have to think that something has to be adjusted to be roughly in the right ballpark.)
     
  17. HOU

    HOU Karting

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    #17 HOU, Mar 15, 2015
    ambitious project. i will continue to use stabilant 22 after thorough cleaning. My electrial connection issues have gradually dissappeared after 5 years of above and 24,000 miles in the seat of my f512m. also i am religious in driving my car every 2 weeks.

    good luck with all that. pm me if you want a copy of the wiring cross reference that i created a few years ago

    js
     
  18. tf308

    tf308 Formula 3

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    #18 tf308, Mar 15, 2015
    As you can see, the Pin outs are different. Which Bank is your photo from?
     
  19. tf308

    tf308 Formula 3

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    #19 tf308, Mar 15, 2015
    Pin 39 is a Grey/blue wire that goes to 30004. 30004 looks like a ground for sec. air injection and 02 sensors, but I am having trouble understanding this.

    Steve, i know you are the man, and can give some insight here.


    So, I didn't explain why I am doing this. The reason is that I have removed my precats and cats on my 512TR. I have noticed, and have discussed with others, that these cars run very rich at startup. Specifically, the car most likely dumps fuel and injections air via the secondary pump to heat up the cats. Since mine are gone, I really want the Euro tune.

    It may be that I need a copy of the euro EPROM in the ECU, but it is possible that pin 39 holds the answer.
     
  20. tf308

    tf308 Formula 3

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    #20 tf308, Mar 15, 2015
    STeve,

    Check out page C13 in the WSM. That is where it says the MAF signal is ignored on models with Cats.
     
  21. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #21 Steve Magnusson, Mar 15, 2015
    You've got that right - 30004 is just a shared ground junction box where a lot of things are connected to ground (the food chain is 70047 connected to ground, 30003 connected to 70047, and 30004 connected to 30003 -- so even though the wires leaving 30004 go to a bunch of different things, they are all always just ground).

    Does seem pretty straight-forward on page C13 -- it's a shame that they didn't add "...instead something something something..." just to be more clear about how not using the MAF signal works. Further reading of the following C pages implies to me that they just strictly rely on the throttle poteniometers for estimating the airflow during cold-running operation on the cat versions.

    Do you still have the air injection system present and working (during cold-running), or does "mine are gone" mean all catalysts and the air injection system are removed?
     
  22. tf308

    tf308 Formula 3

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    #22 tf308, Mar 15, 2015
    I took it all out.

    If I remove pin 39, I can see the difference between bank 1 and bank 2.

    Any big dangers you can think of?
     
  23. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #23 Steve Magnusson, Mar 15, 2015
    Are you saying that you've already tried disconnecting pin 39 on one bank and you do note an operational difference at cold start-up between the banks?
     
  24. tf308

    tf308 Formula 3

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    #24 tf308, Mar 15, 2015
    No, I have not tried yet. I figured I would ask you first. I don't need a ghost busters "do not cross the streams" event.
     
  25. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #25 Steve Magnusson, Mar 15, 2015
    Can't help you there thrillseeker ;), but maybe you should confirm/deny if the MAFs work first? -- i.e., can you vary the voltage on the pin as described in the WSM? It seems odd to me that they didn't use a "dummy" version (with no guts) if they weren't using the MAF signal, or maybe they used the "bad" units on US cars? Just a thought...
     
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