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Thread: There are two very different SBEC2 PCB---Wow are they different

  1. #1
    Supporting Member II Turbo Mopar Contributor
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    There are two very different SBEC2 PCB---Wow are they different

    Hello All,
    First I would like to thank those who donated ECU to my SBEC2 research project. You are the BEST.
    I have learned a TON over the last 6-8 months.
    I would also like to thank those in the community who helped the cause.
    I will be writing up my finding over the next week or so but thought I would send out a primer.
    A few months back I noticed that there are two different PCB used for the SBEC2. http://www.turbo-mopar.com/forums/sh...=1#post1148391

    SBEC2-A ........PCB 4632377, I have both V6 and Turbo version. This board does not have an latch chip. My examples use the 87C257.

    SBEC2-B ........PCB 4517652 are used on V6 and EFI and use a 373 chip (commonly called a latch chip) that is near the EPROM.

    They are very different and need different hardware for flashing but now I am able to flash both from MPTune using my new modified flash module, Thanks Morris for the MPTune support.

    More background to follow.
    Last edited by chromguy; 11-18-2019 at 09:11 AM.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  2. #2
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: There are two very different SBEC2 PCB---Wow are they different

    Tag for exciting news. I really appreciate you spear heading this. The idea of being able to use a v6 computer is incredible. Not only should they be a decent upgrade to the 84 to 89 stuff, but they're still everywhere and cheap.

  3. #3
    Supporting Member II Turbo Mopar Contributor
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    Re: There are two very different SBEC2 PCB---Wow are they different

    Quote Originally Posted by cordes View Post
    Tag for exciting news. I really appreciate you spear heading this. The idea of being able to use a v6 computer is incredible. Not only should they be a decent upgrade to the 84 to 89 stuff, but they're still everywhere and cheap.
    Thanks Brian. This is exactly why I am doing this. I have started the design on a new flash module. I am at the concept stage.
    The idea is a single PCB that will work on SMEC,SBEC and both SBEC2-A and B with improved speed over existing flash modules.
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  4. #4
    Supporting Member II Turbo Mopar Contributor 85lebaront2's Avatar
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    Re: There are two very different SBEC2 PCB---Wow are they different

    Miles, et al, I wonder if the change is also where the speed control input switches changed. From what I have found, the first batch of steering wheel control switch vehicles had a latching (mechanical) on-off switch that worked like the turn signal lever switches, set and resume were still momentary contact like the stalk switch. The later ones the on-off is a momentary contact switch. The later ones have a single wire connection to the SBEC, where the older ones had switches that emulated the stalk. Change seems to be with the 1992 MY from what I can tell.
    "growing old is inevitable, growing up is optional"
    1986 Lebaron convertible to replace totalled 85
    1986 Ford F350 Crew Cab DRW
    1995 Lincoln Continental (project car)
    2011 Ford Flex Limited (wife's)

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