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Thread: LT1 OBD2 hardware???

  1. 09-18-2002 #1
    pugs
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    LT1 OBD2 hardware???

    I am trying to figure out what hardware was used in the 96-97 LT1 cars...Does anyone know???

    All I have found so far is the part number for a 1996 F/Y/B body PCM. It is 16214399. That is all I know. Any help would be great
    97 30th Z28 TT&&86 RX7 awaiting LT1/T56&&80 Buick LeSabre
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  2. 09-18-2002 #2
    RoboGeek
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    Re: LT1 OBD2 hardware???

    what hardware are you referring to... PCM??
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  3. 09-18-2002 #3
    pugs
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    Re: LT1 OBD2 hardware???

    Yes, basically which processor does it use?
    97 30th Z28 TT&&86 RX7 awaiting LT1/T56&&80 Buick LeSabre
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  4. 09-19-2002 #4
    pugs
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    Re: LT1 OBD2 hardware???

    Here are some pics of the internals of a 97 OBD2 LT1 PCM.

    http://lt1tech.com/pugs/OBD2/side1.jpg
    http://lt1tech.com/pugs/OBD2/side2.jpg
    97 30th Z28 TT&&86 RX7 awaiting LT1/T56&&80 Buick LeSabre
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  5. 09-19-2002 #5
    32v_dohc
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    Re: LT1 OBD2 hardware???

    The processor is a MC68HC11F1 variant. Search for 16202476 on google and it will lead you to Tom Hussey's DIY post about the 97 PCM.

    HTH

    John

    I am adding a link

    http://www.diy-efi.org/gmecm/archive.../msg00279.html
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  6. 09-23-2002 #6
    pugs
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    Re: LT1 OBD2 hardware???

    Actually found some info on this. The OBD2 and OBD1 LT1 computers are very similar. Both use Dual 68HC11's. Not sure what the F1 variant is.

    And I have no idea how the dual architecture works....
    97 30th Z28 TT&&86 RX7 awaiting LT1/T56&&80 Buick LeSabre
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  7. 09-23-2002 #7
    32v_dohc
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    Re: LT1 OBD2 hardware???

    Not sure what the F1 variant is.

    The 68hc11 is the generic chip. For different requirements of ram, EEPROM, and output type stuff there are different packages. The F1 is one of those packages. If you go to the motorola web site and search for mc68hc11f1 you can get the data sheet for that processor.

    And I have no idea how the dual architecture works....

    It can best be described as two "networked" computers. Each does its own thing, has its own PROM processes independantly of the other but they share some information.

    Check out incoming there is a zip file called lt1_obd2_tside.dis. It is a very well done hack of the obd2 side of your computer. It even shows all the correct paging schemes for the 128K on a hc11.

    HTH

    John
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  8. 09-23-2002 #8
    pugs
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    Re: LT1 OBD2 hardware???

    Quote Originally Posted by 32v_dohc
    Check out incoming there is a zip file called lt1_obd2_tside.dis. It is a very well done hack of the obd2 side of your computer. It even shows all the correct paging schemes for the 128K on a hc11.
    Check where? This sounds like it could be very helpful, just not sure where you are telling me this file is

    Thanks in advance though
    97 30th Z28 TT&&86 RX7 awaiting LT1/T56&&80 Buick LeSabre
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  9. 09-23-2002 #9
    32v_dohc
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    Re: LT1 OBD2 hardware???

    ftp://ftp.diy-efi.org/incoming/

    John
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  10. 05-06-2003 #10
    beerman
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    Re: LT1 OBD2 hardware???

    16214399 is for 1996
    16242921 is for 1997

    Tom Hussey also wrote the 97dmp.exe

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