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Thread: '94 Jeep Cherokee Tuning

  1. #41
    Supporting Member Turbo Mopar Contributor
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    Re: '94 Jeep Cherokee Tuning

    also, can someone confirm if the jeep uses a knock sensor? i'm trying to ID if that code exists in the cal.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  2. #42
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by wowzer View Post
    also, can someone confirm if the jeep uses a knock sensor? i'm trying to ID if that code exists in the cal.
    Nope Jeep 4.0's do not have a knock sensor


    By the way, i am more than willing to be a guinea pig for any testing once we have these figured out. I have a 94 Grand cherokee with a 4.0 a/t and I have a spare ECU that im going to socket here shortly my spare ECU is a 56028310. I can pick up an eemprom burner if need be to burn/test cals.
    Last edited by sev80; 02-14-2017 at 07:08 PM.

  3. #43
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: '94 Jeep Cherokee Tuning

    Crossing fingers that this helps figuring out the V6 code also
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  4. #44
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by sev80 View Post
    Nope Jeep 4.0's do not have a knock sensor


    By the way, i am more than willing to be a guinea pig for any testing once we have these figured out. I have a 94 Grand cherokee with a 4.0 a/t and I have a spare ECU that im going to socket here shortly my spare ECU is a 56028310. I can pick up an eemprom burner if need be to burn/test cals.
    that would be great. the version i posted should be able to be burned back to a chip. however, i would suggest you read your chip and send it to me so i can take a look at it and compare to the one i already did to see what, if any differences, there may be.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  5. #45
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    Re: '94 Jeep Cherokee Tuning

    tpl missing from the zip? (and/or the 3d tables missing from the .asm)

  6. #46
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    Re: '94 Jeep Cherokee Tuning

    try this
    Attached Files Attached Files
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  7. #47
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by wowzer View Post
    try this

    Wow awesome to hear! Happy to Help. I'll work on getting the ecu socketed, can you suggest me burner to buy and which eeprom chip I should pick up?

    the only major difference I know off of hand is my ecu is for a auto trans and the 781 code is for a manual trans. I'm wondering if there is any difference between Cherokee and grand Cherokee code.

  8. #48
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: '94 Jeep Cherokee Tuning

    Moates Burn2 should burn any chip you need.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  9. #49
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    Re: '94 Jeep Cherokee Tuning

    counted the pins on my sbec II, it's 28 pin. but which chips should I buy that are compatible with it?
    Last edited by sev80; 02-15-2017 at 08:20 PM.

  10. #50
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    Re: '94 Jeep Cherokee Tuning

    I think the 27sf512 should work?
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  11. #51
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by Force Fed Mopar View Post
    I think the 27sf512 should work?
    Only with a latch adapter. The original chip would be a 87C257 from Ti. But, a Moates Burn2 won't write them.
    https://db.tt/SV7ONZpQ
    Rob Lloyd
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  12. #52
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    Re: '94 Jeep Cherokee Tuning

    So I picked up a very late production (4/95) SBEC II for the jeep. I need to connect it and make sure my truck runs with it but the good news is it's 32 pin!!

  13. #53
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    Re: '94 Jeep Cherokee Tuning

    This is the cal I had been working on before I had got pointed over here by @wowzer. https://nc4x4.com/forum/threads/feel...tuning.177279/ (crosslinked since I can't seem to upload files here) Mine has the fuel and spark tables mapped out, with inputs referenced thru tracing the code. Hoping this will help wowzer maybe roll it into his cal and we'd have one nearly complete cal.

  14. #54
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    Re: '94 Jeep Cherokee Tuning

    I want to tackle this one of two ways for testing:

    first way is using that late 95 sbec-2 I just got and using shelgame's flashing tool to flash it with experimental code. I'd prefer to do it this way...


    But as a backup, the second way is with an older 28 pin socketed sbec-2 with a latch adapter. To that end, I spent the last 6 hours desoldering the 28 pin eprom from my late 93 sbec2. It seems that I was successful!

    All the solder pads look like they're in decent shape and I need to solder in a socket. Trouble is, in all my excitement, I didn't make note of the chip's original orientation.... does the notch face the heat sink or away from the heat sink?



    im going to be ordering the latch board and competents from osh park to solder together a latch board.


    lastly, a_kelly and wowzer asked me for the 381 bin from the ecu I just modified. Which rom Bruner / reader can I Use to read it? Will the burn 2 do it?

  15. #55
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    Re: '94 Jeep Cherokee Tuning

    It should be a 28c256 which most readers should support. I plan on reading mine out over sci before I remove the chip.

  16. #56
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by sev80 View Post
    I want to tackle this one of two ways for testing:

    first way is using that late 95 sbec-2 I just got and using shelgame's flashing tool to flash it with experimental code. I'd prefer to do it this way...


    But as a backup, the second way is with an older 28 pin socketed sbec-2 with a latch adapter. To that end, I spent the last 6 hours desoldering the 28 pin eprom from my late 93 sbec2. It seems that I was successful!

    All the solder pads look like they're in decent shape and I need to solder in a socket. Trouble is, in all my excitement, I didn't make note of the chip's original orientation.... does the notch face the heat sink or away from the heat sink?



    im going to be ordering the latch board and competents from osh park to solder together a latch board.


    lastly, a_kelly and wowzer asked me for the 381 bin from the ecu I just modified. Which rom Bruner / reader can I Use to read it? Will the burn 2 do it?
    Away from the heat sink.

    The Burn2 might read it, but it won't be able to re-write it. And, you'll need a UV lamp to erase it.

    - - - Updated - - -

    Quote Originally Posted by A_ Kelley View Post
    It should be a 28c256 which most readers should support. I plan on reading mine out over sci before I remove the chip.
    It can't be a 28C256. The pinout doesn't match.

    Most likely, it's a 87C257 (if it's ceramic), or a Toshiba chip whose number I forget. Both are also 32k chips.
    https://db.tt/SV7ONZpQ
    Rob Lloyd
    '89 Daytona C/S

    2.5 T1 Auto
    13.24 @ 100.5mph
    NHRA #3728 AF/S

    boostbutton.com
    tuning wiki

  17. #57
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by ShelGame View Post
    Away from the heat sink.

    The Burn2 might read it, but it won't be able to re-write it. And, you'll need a UV lamp to erase it.

    - - - Updated - - -



    It can't be a 28C256. The pinout doesn't match.

    Most likely, it's a 87C257 (if it's ceramic), or a Toshiba chip whose number I forget. Both are also 32k chips.



    Just finished socketing my 12/93 Sbec II and the original chip is a 27C256. Does this mean the latch chip is built into the board?

  18. #58
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    Re: '94 Jeep Cherokee Tuning

    Quote Originally Posted by sev80 View Post
    Just finished socketing my 12/93 Sbec II and the original chip is a 27C256. Does this mean the latch chip is built into the board?
    Hmm, must be. If the original is a 27c256, then you should be able to sub a 27SF512 in there no problem. Just set the right offset since the chip is double the size. The Moates Burn2 of course can read the 27C256 and read/flash the 27SF512.
    https://db.tt/SV7ONZpQ
    Rob Lloyd
    '89 Daytona C/S

    2.5 T1 Auto
    13.24 @ 100.5mph
    NHRA #3728 AF/S

    boostbutton.com
    tuning wiki

  19. #59
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    Re: '94 Jeep Cherokee Tuning

    sweet :thumbsup

    I ordered a Willem style burner and going to order some 27SF512 chips.

    Have you guys heard of the latch chip being already on the SBEC II? Or is this a first?

  20. #60
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    Re: '94 Jeep Cherokee Tuning

    Yes, I've seen it in some later ECU's. Might be an SBECIII. I have a list of the later SBECII/III differences somewhere...
    https://db.tt/SV7ONZpQ
    Rob Lloyd
    '89 Daytona C/S

    2.5 T1 Auto
    13.24 @ 100.5mph
    NHRA #3728 AF/S

    boostbutton.com
    tuning wiki

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