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Thread: Definitive EFI ECU Pinout (KS Mod-friendly)

  1. #21
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    Quote Originally Posted by GalantOnly View Post
    ...and pin 60 ain't connected at all And it's both on PFL and FL...
    ??!? What are you talking about? Of course it's connected, it's how the ECU measures your speed, people cut this wire to get around the speed limiter..
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  2. #22
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    Quote Originally Posted by foxdie View Post
    Jeez, um.. okay.

    1. I was under the impression that all facelift autos did NOT have ASC or TCL, is this correct?
    2. What about manuals?
    1. Correct. That's why those wires goes to A/T ECU instead of ASC ECU
    2. On manuals the pins 53 and 59 are empty

  3. #23
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    Quote Originally Posted by foxdie View Post
    ??!? What are you talking about? Of course it's connected, it's how the ECU measures your speed, people cut this wire to get around the speed limiter..
    That's pin 86...

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    Quote Originally Posted by GalantOnly View Post
    That's pin 86...
    Great, that's 2 problems I've got to deal with now *gets his soldering iron*

  5. #25
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    Here's the pics of the low row of connector "C", which is called C-37 in diagrams. You can see pins from 57 (blue/white) to 62 (red/white). As you can see, pin 60 and 61 are empty on A/T's... Also pin 59 is empty om M/T

    Connectors from left to right: PFL M/T, PFL A/T and FL A/T
    Attached Images Attached Images
    Last edited by GalantOnly; 11-08-2011 at 10:45 PM.

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    Thanks for that Alex, that's great

    Question, does pin 59 serve any function other than ground, particularly on FL auto?

    And anymore to add?

  7. #27
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    Quote Originally Posted by foxdie View Post
    Thanks for that Alex, that's great

    Question, does pin 59 serve any function other than ground, particularly on FL auto?

    And anymore to add?
    Not sure about any other functions, but you can see how pin 59 looks like on the diagrams...
    Attached Images Attached Images

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    Okay, before I upload the next version, can anyone confirm if Pin 60 (Vehicle Speed Sensor Signal) is present on a Facelift Manual?

    It was on Kats pinout as a white wire with green stripe, yet we've got proof above that it's not present on all prefacelifts and facelift autos.

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    Version 5 uploaded with expanded definitions of some pins and all information above (up to this post), as FL M/T pin 60 presence is unconfirmed I've put a question mark beside it

  10. #30
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    D-1 is Start signal from ign barrell on manual
    Less a Driver of a VR4, more an owner of a pile of parts...

  11. #31

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    Quote Originally Posted by taylor View Post
    D-1 is Start signal from ign barrell on manual
    This is correct. this should be start.

    Also, shouldnt C-10 and C-11 be front and rear O2 heaters?

    if i cbf getting to my ECU, i'll double check...

    Edit: this is based on disassembly.

  12. #32
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    D-76 is for the front O2 heater and D-75 is for the rear (on N/A V6 only)

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    Ahh! This would explain why I'm having problems as described in this post.

    I need to consult with Ken why he labelled this pin as being usable. For now, I've removed it from the list of +12V pins and amended the description for the diagram for pin D-1.

    Before I release a new version, please can I double check pins A-12 and A-25 are both only connected to +VE when the ignition barrel is set to "On" and not "Start"?

    I'm going to relabel them as clearly as I can.

  14. #34

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    Quote Originally Posted by foxdie View Post
    Before I release a new version, please can I double check pins A-12 and A-25 are both only connected to +VE when the ignition barrel is set to "On" and not "Start"?
    they look like the power source for coils, injectors or something. Usually after main engine control relay, colour turns to red as well. black/white usually is ign1 from barrel.

    i'm only going from all the mitsu looms i've dissected over the years. Is there any decent wiring diagram for our car?

    Quote Originally Posted by GalantOnly View Post
    D-76 is for the front O2 heater and D-75 is for the rear (on N/A V6 only)
    Those pins sound like the o2 signal. our oxy sensors are 4 wires, so they have an internal heater that the ecu usually controls. (unless they are perminately connected to 12v)

    i couldnt get to my ecu tonight, so i'll try and have a look tomorrow.
    Last edited by BCX; 13-12-2011 at 01:00 PM.

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    Merlin's legnum tuning guide refers to using pin 7 on connector 4 to connect your MAP sensor. presumably a 0-5v input.

    but his document never expands on what address you can log it from and such.


    anyone know about that?

  16. #36
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    Is there a link to said document? I'll try and trace that pin back tonight and see where it goes.

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    Quote Originally Posted by foxdie View Post
    Is there a link to said document? I'll try and trace that pin back tonight and see where it goes.

    http://ozvr4.com/forums/showthread.php?6650-Merlins-EcuFLASH-VR4-amp-LEGNUM-Tuning-Guide


    Curiously in section 10 he talks about using the 1 rear o2 input as EITHER map or wideband.. but in his ecu pinout he marks the map sensor for a different pin.

    so not sure where he's got it from.

  18. #38
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    Yep, I suspected as much after digging around Evo 7202 / 7203 pinouts, he's referencing pin 77 which is unused as Hamish@EvoScan told me, sometimes you just gotta try wiring something to it and scouring the MUT requests

    I also suspect pins 73 and 74 can be used, and that all "D" (C-39 in wiring diagrams) are all 0-12V tolerant inputs. I'm not willing to bet an ECU on that though, someone fancy donating a 7201 to science?

  19. #39
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    Right, I've traced all the unused pins on a VR-4 7202 PCB (JE331B154C).

    Pins 9, 20, 24, 34, 51, 61, 73, 74 and 77 all abruptly end where there's a missing component (ie. different board revisions).

    Pin 42 however appears to go someplace, first through a resistor and then into a whopping capacitor, then to an unpopulated IC connector, this says to me it's some kind of output that can possibly be made to work as an output if we can identify the IC (IC104), however this doesn't seem to be used on Evos 4-6 either so may be a lost cause. Pins 39 and 40 also go straight to this IC104.

    Pin 33 interestingly goes all the way back to close to an IC right next to the main CPU, passing through a darlington pair, on Evo 4-5 this is used to turn the alternator on and off (G terminal), so this may be a viable ECU output for something like an Intercooler Spray

    Pin 6 also goes to transistors near the ECU connector, this is used as the Secondary Air Solenoid on Evos 1-6 to keep turbos spooled up during gear changes and as the Exhaust Gas Recirculation control on Evos 7's for emissions. This could also potentially be used as an output

    How Merlin used pin 77 for a MAP sensor then I have no idea, I'm wondering if the information he posted was untested and using info from Evo ECUs which have MAP sensor circuitry. What we might find is we can add these components manually, I'll do some more digging when I get time.

  20. #40
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    That said, I've just compared the above board to an Evo 5 7202 ECU JE331B153C, the PCB layout is notably different. Could be the above are just remnants of development removed or reserved for later use.

    Still, it might be worth someone looking into repopulating certain components to see if extra inputs / outputs can be manually added.

    Also doubly worth investigating pins 6 and 33 as outputs as those look like they could be ready to rock

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