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Thread: Replacing 7mgte ecu

  1. #1
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Replacing 7mgte ecu

    G'day guys,

    I want to begin labeling, splicing and the general installation of my Dualsport (has it's own loom) I'm just wondering if when installing a standalone ecu I can completely unplug and remove the original ecu? I'm guessing no, as it appears to have a few things that my ems won't be taking control of.

    Below is the pinout of the early 7mgt ecu and the pinout on the Dualsport, I've crossed out what i presume will become redundant on the standard computer when the new one is installed, and left things i presume will still require power when the new ecu is installed. Can anyone with experience confirm/deny if that looks correct.

    Thanks everyone.
    Ashlin




  2. #2
    2JZ POWA Chief Engine Builder GU11TY's Avatar
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    Default Re: Replacing 7mgte ecu

    man good luck wit it.. soz i cant help u but altr thinking of upgrading my 7mgte ecu etc so i'd like to see how this one goes 4 u
    Z20 SOARER WHORE (totalling 14 z20s so far)
    PREVIOUS RIDES - 5 GZ20 soarers, 1 MZ20 soarer, 2 MZ20 aerocabins soarers, 7 MZ21 soarers, 3 ke70s, AE92 rola, 1973 corona, 85 corona, tarago party bus
    CURRENT - 530hp 2jz MZ20 Soarer and race soarer with carbon fibre bonnet and boot and 8point cage

  3. #3
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Replacing 7mgte ecu

    IDL will not get used by the EMS
    G2 will not get used by the EMS (well, one out of G1 and G2 will not be used)
    Airtemp will not get used, as that is in the AFM, and that is being ditched.
    You will need to install a different airtemp sensor.

    7MGTE runs 3 lots of 2 injectors, 1 ignitor, and 3 coils (as I'm sure you are aware).
    You will have to make sure the EMS can do the same, otherwise you will need to purchase ignitors.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  4. #4
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    cheers Cruz. I've got an EMS 3 coil ignitor, the loom it came with looks complete and has it's own air temp and water temp sensors. Can you see anything else could be cut and removed from the standard loom?

  5. #5
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Replacing 7mgte ecu

    EMS shouldn't use the CSI or the CSI temp sensor either.
    I'm unsure on the EMS's ability to control the factory ISCV either. But if it can it wont need the two +12v wires that Toyota uses. It will just use the four other ones
    Aftermarket ecu's generally don't use IGT, but rely on IGF only (or is it the other way around?)
    None of the dedicated AFM wires are needed either (I presume EMS has a dedicated MAP sensor?)
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  6. #6
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    The EMS has a choke feature which should make the CSI useless and using one of the outputs i will be able to use the ISCV aswell which is nice. I'm unsure about the IGT/IGF stuff sorry

    btw - would give you +rep but I can't still lol

    edit- I had a little read of this .pdf which I think explains how ignition works pretty well. If IGF is an error check return signal how could an aftermarket ecu use this without having sent an IGT first
    And also yep, ecu has a map sensor
    Last edited by kemicalx; 10-04-2006 at 01:13 PM.

  7. #7
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    Another question, Do injectors require the polarity a certain way, I ask because the injector plugs on the loom i got have the ground wire connected to the +ive and the red wire going to the switching ground off the ecu.

  8. #8
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Replacing 7mgte ecu

    I don't beleive so no.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  9. #9
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    thanks alot once again mate

    like i said, when I can give you some more rep I will

  10. #10
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    I unwrapped the standard loom today and did some labeling/wire tracing. It all looked pretty straight forward. Because i have another loom for the EMS that has everything that the EMS requires for the engine to run should i just disconnect/cut the things I've highlighted red from the standard ECU and just leave things like knock, temp and the o2 sensor connected while things like TPS and Cam Pos. can just be unplugged from the standard loom and then plugged into the new one?


  11. #11
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Replacing 7mgte ecu

    Isn't the EMS a 100% standalone, and thus you remove the stock ecu completely?
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  12. #12
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    yup, but i'd really like to keep the other functions the original unit had, like knock sensing, the speedo, A/C, etc.

  13. #13
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Replacing 7mgte ecu

    Piss the factory ecu off.
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
    2013 86 GTS

  14. #14
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    mmm it would be easier..

  15. #15
    BHGBTDT Domestic Engineer kemicalx's Avatar
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    Default Re: Replacing 7mgte ecu

    A couple more Q's,

    For an engine to start correctly is this how things should be switched via the ignition switch?

    - On AM2 the fuel pump is connected to power, as are the coils, while the injectors are already connected to 12v, but will be switched on/off via ground by the EMS once the engine is actually rotating.
    - On AM1 the starter motor and CSI kick the whole lot off,
    - Once started the car stays on AM2 but now with the engine running.

    Also would any of you have an idea as to what pin 27 (Pump relay control) of the EMS does? I first presumed it switched the fuel pump on, however there is no output from pin 27 when the EMS is on, Also there is no output from the relay that goes to a fuel pump

    Is it likely it just goes in place of the standard ECUs FPR output that switches the fuel pump to the resisting circuit? (Is this used for a hard rev limit or something?)

    Finally, will it be ok to do away with the EFI Main Relay and the Circuit Opening Relay?

    I’ve been messing with some wiring diagrams in paint and *think* I’ve wired up everything correctly, but I’d appreciate it if someone could have a look over it all and see if you think she’ll work.

    Cheers all, any info on this stuff would be a great help

    My butchered diagram (sorry if it's a bit messy)


    And just for reference a few standard wiring diagrams

    Fuel system


    Circuit opening relay


    EFI main relay


    Starter motor
    Last edited by kemicalx; 15-04-2006 at 02:38 PM.

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