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

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    Post Definitive EFI ECU Pinout (KS Mod-friendly)

    Hi all!

    The following is the current known pinout for the EFI (engine) ECU. It encompasses research from other dedicated members and myself through service manuals and wiring diagrams. A big thank you to all who contributed (and who contribute in future)

    Because different people reference each pin in different ways, this diagram refers to pins in both the wiring diagram format (absolute pins ie. 52) and by connector (C2).

    In addition to that, I've also added the following;

    1. A basic description of each pin to help diagnosis of faults
    2. Where possible, additional uses for some pins, these are described at the bottom of the diagram

    Last update: 5th January 2018 - revision 6

    VR4 Engine ECU Pinout v6.jpg

    Access the most up to date info here on Google Sheets
    Download the latest version here to print straight to A4

    If anyone feels there's missing information or sees an error, please don't hesitate to let me know and I'll update the diagram
    Last edited by foxdie; 05-01-2018 at 05:15 PM. Reason: Updated to include PFL / FL and AT / MT info
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    Very nice... so, reading the document I'm seeing your third note... is it possible to get the standard ECU to read from a MAP sensor on pin 75, instead of the MAF?

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    Quote Originally Posted by wintertidenz View Post
    Very nice... so, reading the document I'm seeing your third note... is it possible to get the standard ECU to read from a MAP sensor on pin 75, instead of the MAF?
    Yes, but only for the purpose of logging (with EvoScan or the OpenPort 2.0s Standalone Logging-to-SD function). The ECU doesn't (yet) have the code to make use of a MAP sensors input, also this pin is limited to reading signals between 0-5 volts, applying voltage outside of this range WILL result in damage.

    Things Pin 75 can be used for logging the following;
    • Wideband O2 sensor signal
    • MAP / Boost sensors that outputs between 0-5V
    • Any pressure / temperature sensors that output between 0-5V


    Hope this helps.
    Last edited by foxdie; 04-08-2011 at 11:21 AM.

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    Yep 0-5v is the swing for the sensors on the car so do not apply 12v to it as you WILL feck your ecu


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    Updated, thanks John

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    I heard, that VR4-s after 2000 have a different ECU. Is this correct?

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    Quote Originally Posted by Reconstructor View Post
    I heard, that VR4-s after 2000 have a different ECU. Is this correct?
    Partially correct, although they were technically the same ECU (as all are interchangeable without any major problems), there were minor revisions; 7201, 7202 and 7203.

    All pre-facelifts (1996-1998) came with a 7201 ECU, facelifts (1998-2003) received either a 7202 or 7203 ECU, the latter being fitted towards the later end of the manufacturing period.

    All ECUs had near identical programming, the only differences were as follows;
    1. Only the 7202 and 7203 can be reflashed with a cable. Reflashing the 7201 requires desoldering the EEPROM.
    2. There are very minor differences between automatic and manual gearbox ROMs (such as "do not start if in gear").
    3. 7201 ECUs on Automatic cars were tuned for 260 PS (256 HP). 7201 ECUs on Manuals, and all 7202 / 7203s, were tuned to 280 PS (276 HP).


    Hope this helps!
    Last edited by Nutter_John; 10-08-2011 at 11:15 AM. Reason: corrected the years

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    Thank You very much for this detailed explanation. As I understand it, there is no any changes in pinout layout in different versions?

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    Quote Originally Posted by Reconstructor View Post
    Thank You very much for this detailed explanation. As I understand it, there is no any changes in pinout layout in different versions?
    Nope, no pinout change between 8G VR-4 ECUs, although there are a couple of pins that only get used in some cases (auto vs manual for example).

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    Understand, thanks again.

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    Some pre-facelift VR-4s (Notably Super VR-4s) came with MH7202 based ECUs.

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    On FL ECU's pins 31, 32 and 46 are not connected...

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    Thanks guys, doing an update now.

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    ...and pin 79 is brown/green on FL

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    Quote Originally Posted by GalantOnly View Post
    ...and pin 79 is brown/green on FL
    Brown / Green for Diagnostic Pin 26? You absolutely sure? Browns not used anywhere else on the engine loom (to my knowledge).

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    Absolutely
    Sitting here with FL A/T loom on my table and wiring diagrams beside
    It's Brown/Green from the ECU untill connector C-83 (under the radio) and then from C-83 till diagnostic connector it become Green/Yellow.
    PFL loom have green/yellow all the way...

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    And I can see that pins 53 and 59 are very complicated fellas

    Pin 53:
    PFL - white and goes straight to ASC ECU pin 19
    FL - black and goes straight to A/T ECU pin 54
    Cars with TCL, but no ASC, it goes to TCL ECU

    Pin 59:
    PFL - black and goes to ASC ECU pin 6 (and grounded)
    FL - white and goes to A/T ECU pin 53
    Cars with TCL, but no ASC, it goes to TCL ECU

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    Cool, updated first post

    Edit: missing info in post 17

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    Quote Originally Posted by GalantOnly View Post
    And I can see that pins 53 and 59 are very complicated fellas

    Pin 53:
    PFL - white and goes straight to ASC ECU pin 19
    FL - black and goes straight to A/T ECU pin 54
    Cars with TCL, but no ASC, it goes to TCL ECU

    Pin 59:
    PFL - black and goes to ASC ECU pin 6 (and grounded)
    FL - white and goes to A/T ECU pin 53
    Cars with TCL, but no ASC, it goes to TCL ECU
    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?

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    ...and pin 60 ain't connected at all And it's both on PFL and FL...

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