Results 1 to 8 of 8

Thread: 1990-1996 ecm swap Info

  1. #1

    Array
    Status
    Offline
    Join Date
    12-13-2014
    Posts
    122
    Location

    redding ca
    Vehicle

    1990 Mitsubishi Mighty Max
    Engine

    4G64

    1990-1996 ecm swap Info

    ok so i got some pictures to show you what i mean about how you can use any ecm from 1990-1996 on your truck.
    If you have different connectors than the ones shown going into your ecm than its a 1994-1996 cal emission harness. these are rar to find so you dont need to worry.

    so if you have a 1993-1996 harness like the one shown and you want to use a 1991-1992 ecm just move that wire over. this is on the center plug going into the ecm btw.

    also here is an image of a 1991-1992 harness, its not real clear but if you look close enough you will see what i mean

    I have personally tested both styles of ecms on both 6bolt and 7bolt motors and they work fine on both.

    So now the secret is out that you dont have to spend $115+ on a 1991-1992 when you can get the 1993+ ecms for 45 bucks on ebay.

    A Side note: the 1991-1992 ecm in my opinion has a slightly better idle than the 1993+ ecms and that goes with when its paired with either 6 or 7 bolt motors. the 1993+ works great though. either ecm is good for smog in cal. ive use both combos sense ive had my trucks.

    this info goes out to those poor folks with a 1990 mighty max like myself.

    the 1990 mighty max has the same wiring going to the 1g style MAF as the 2g style mighty max MAF. You can simply cut the pigtail off a 1991-1996 mighty max maf and splice it into your harness. the wire coating is even the same between the two. the one thing that the 1990 mighty max does not have is the MAF Reset wire. You will need to grab this wire when converting your 1990 to use a 1991-1996 style MAF and ecm. YOU CANNOT USE THE 1990 ECM WITH THE 1991-1996 MAF. so if you do this be safe and create a duel connector like this.

    this way you can swap between MAFS and ECMS latter if you want.

    Another side note for 1990 guys. this year came with different injectors than the 1991-1996 mighty max trucks. they are the same flow and cc but have a different part number and are specific to this year. This may sound far fetched but i have also tried the 1991-1996 ecms with them and they work fine. i did notice a tad bit more fuel consumption like going from 23mpg to 22mpg. nothing big and i did do smog like this.

    I Hop[e this helps you and answers all your questions. I Love this site and love these trucks.

    Final notes. i posted this in another thread both thought that it deserves its own thread so if someone searches online they will see it. I have gone threw the troubles of the ecms on these trucks and it sucks.

  2. #2

    Array
    Status
    Offline
    Join Date
    08-11-2012
    Posts
    1,199
    Location

    Richmond, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B
    This is Wiki material. If I could give you a 2nd rep point, I would.
    I can help get your truck to pass California smog! PM me.
    California BAR Smog Inspector License #EO635469
    "Keep 'em on the road."

    See what I have for sale:
    http://stores.ebay.com/zims

  3. #3



    Array
    Status
    Offline
    Join Date
    03-26-2011
    Posts
    1,512
    Location

    Vacaville, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    4G63-T
    Great thread!!
    I left this thread here in the forum but also copied it and made it a Wiki so maybe it will make it easier to find one or the other when people are searching.
    Josh
    09 BMW 335i E92 Twin turbo
    89 Macrocab 4g63 Turbo swapped & Bagged: Build Thread

  4. #4

    Array
    Status
    Offline
    Join Date
    12-13-2014
    Posts
    122
    Location

    redding ca
    Vehicle

    1990 Mitsubishi Mighty Max
    Engine

    4G64
    thanks guys. this info took a lot of time, trial and error, along with multiple junkyard trips. i have to admit that when i got my first truck (the 1990) and could not find either a maf or the ecm on a tight college budget i started looking at the differences between the different years and found that it was surprisingly very little. after getting the 1992 and looking it over i was able to further solidify what i already discovered. what topped the cake was my 1994 parts truck. just that one swapped wire. at first i thought that there was more but after going to the yards and tracing some of the harnesses and dissecting them i found out that that was it. again i was able to experiment a lot over my summer vacations, take tons of trips to the junkyards from Redding to Sacramento and just really read up on this site in particular. sense i got so much info from this site it was time to give something back. i would spend hours just reading over the threads and using what i learned to keep my trucks running.

  5. #5

    Array
    Status
    Offline
    Join Date
    08-11-2012
    Posts
    1,199
    Location

    Richmond, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B
    finalfighter, what are the major differences between the OBD1 harness and the 1996 OBD2 harness besides the downstream O2 sensor and OBD port?
    I can help get your truck to pass California smog! PM me.
    California BAR Smog Inspector License #EO635469
    "Keep 'em on the road."

    See what I have for sale:
    http://stores.ebay.com/zims

  6. #6

    Array
    Status
    Offline
    Join Date
    12-13-2014
    Posts
    122
    Location

    redding ca
    Vehicle

    1990 Mitsubishi Mighty Max
    Engine

    4G64
    If the truck is a 1996 model AND manufactured in 1996 it will have an obd2 data port regardless of it being federal or cal emission standard. This harness has different style of connectors going into the ecm and this info cant be used on them. i have only ran across one of these. also they use a different throttle body motor setup than the trucks manufactured from 1989-1995 with FEDERAL emissions, and trucks from 1990-1993 with cal emissions. the CAL emission trucks and FEDERAL from 1990-1993 all used the same throttle body idle control motor setup and the 1994-1996 trucks with federal emissions use the same throttle body idle control as the 1990-1993 cal and federal. the 1994-1996 cal emission trucks manufactured from 1993-1995 use the same throttle body as the trucks manufactured in 1996. they do not have an obd2 port. they use the obd1 style. also there harness has different plugs going into the ecm. i cant remember if they are the same as the ones manufactured in 1996 with the obd2 data port because they are so rare and i have only found one. Cal emission trucks from 1994-1996 are sort of rare too so you will almost always run into the 1994-1996 trucks with a federal style ecm.


    this seems really confusing but i hope it answers your question.

  7. #7

    Array
    Status
    Offline
    Join Date
    08-11-2012
    Posts
    1,199
    Location

    Richmond, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B
    Thanks. I follow you, I deal with OBD0-1-2 and CAL/FED differences all day long.
    I can help get your truck to pass California smog! PM me.
    California BAR Smog Inspector License #EO635469
    "Keep 'em on the road."

    See what I have for sale:
    http://stores.ebay.com/zims

  8. #8

    Array
    Status
    Offline
    Join Date
    06-27-2015
    Posts
    180
    Location

    Bothwell,Ontario
    Vehicle

    1991 Dodge Ram 50
    Engine

    4G64
    Could we swap in a turbo evo car ecm into our truck?

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •