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Type: Posts; User: Tom H

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  1. Thread: 1997 F-Body ECM

    by Tom H
    Replies
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    8,349

    I think & will confirm when I get a chance, the...

    I think & will confirm when I get a chance, the area just above ram connects to the injector driver circuit (?)

    Have you checked to see if the microcode has changed? If yes, the part can be hooked...
  2. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    I have done some looking at the registers the...

    I have done some looking at the registers the code uses. This is NOT finished work but rather a snap of where I am on this project...



    =============================
    POINTER TABLE RAM
    $1600 ...
  3. Replies
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    Thank you... this is a good thread for me. I have...

    Thank you... this is a good thread for me. I have some documents specific to the '97 lt1 malf codes I will post.

    -Tom
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    10,709

    Thanks, that helps. About to post some analysis...

    Thanks, that helps. About to post some analysis of the timer chip... switching threads.

    -Tom
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    Prime pulses

    Can anyone give a good description of "prime pulse". I have run across the term "second prime pulse" and would like to know about it.

    Guessing this could be an initial injector squirt of fuel to...
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    I am interested in what you are doing & would...

    I am interested in what you are doing & would help if I can.

    I believe that early cars (1997 and earlier: perhaps '98, '99) connect to various modules outside the PCM with serial / aldl type...
  7. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Perhaps we have someone who knows DSPs well here?...

    Perhaps we have someone who knows DSPs well here?

    My question relates to the patent I mention above in this thread. The execution unit has a block that is named "Immediate Data Generator. The...
  8. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    I am glad folks are interested in this... I would...

    I am glad folks are interested in this... I would like to get it all figured out if I can.

    I did some more looking through initialization of the TIO. First the microcode is initialized, then the...
  9. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    TPU / TIO

    I continue to look at the "TPU" as it appears to be where most if not all of the time sensitive engine controls take place. I began by looking at it's initialization. The manner that it is...
  10. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    VATS

    In looking at distributor inputs, I am now convinced the Timer Processor Unit (TPU) is involved. That needs to be figured out to have any hope of understanding the heart of the system. The injector...
  11. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Looking through the high res side, it is received...

    Looking through the high res side, it is received by a quad comparator with feedback hysteresis. Signal then hits a 28pin plcc that I have no knowledge of. That part is marked 609-3700521 symbios....
  12. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Hi Kur4o, Had an initial look at your Q... The...

    Hi Kur4o,

    Had an initial look at your Q... The IRQ is pin 19 on the processor. It tracks to a pull up resistor on the underside and then to the gate array that we have little info on. The gate...
  13. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
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    8,349

    Hi Kur4o I am making progress on the Tside...

    Hi Kur4o

    I am making progress on the Tside code. I lack knowledge about a number of things
    that slows me down, but I am working away at it. I need to find out more about
    built in testing. I see...
  14. Thread: GM PIDs

    by Tom H
    Replies
    3
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    975

    Hi NSFW, I am still working away on the code,...

    Hi NSFW,

    I am still working away on the code, also interested in what you are doing. Is the ADX file something you could share with us?

    Cheers -Tom
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    Bit pattern vs. Cal code

    Nope... not sure at all. Many sources of info differ. Could you explain calibration code?? In my understanding (a bit of a fog at best) we have:

    Software : Code base for all similar PCMs...
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    This section is a great help. I have a question...

    This section is a great help. I have a question about a couple of term... most I can guess, but a GM definition would be more exact

    ENDMODEL END MODEL PART NUMBER
    SIDERAIL SIDE RAIL...
  17. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    I had a close look at Mode 3C used to read...

    I had a close look at Mode 3C used to read various parameters from the PCM including VIN...

    MODE $3C

    Mode $3C is loosely defined in SAE J2190. In my PCM (calibration #?16236217?) the request...
  18. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    First off Congratz dzidaV8. Fantastic that you...

    First off Congratz dzidaV8. Fantastic that you have the download/upload solved!!

    I was asking after Mode 19 because IF it is similar to Mode 18, a whole bunch of memory locations can be...
  19. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    looks like great progress. For me, I have set the...

    looks like great progress. For me, I have set the download aside for a bit. I have run into problems with understanding the queue of messages. In code from the '97 processor there is a scheme for...
  20. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Download code snips II

    Interesting... download to both sides may set/clear some flags. Hmmmmm



    It does seem to me that when DL commands are issued, the code places the DLC in 4X mode. In the code


    ...
  21. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Download code snips

    Hi,
    I want to reply to all your thoughts, this post is just on the first bit



    I think response 73 is reserved for download without execute. In my dictionary of code responses: Code $73 - Block...
  22. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Hi, I feel bad to be imposing with stuff that I...

    Hi,
    I feel bad to be imposing with stuff that I should have been able to figure out by now but...

    Here a screen shot of my d/l app
    14112

    read it bottom to top why... just have not fixed it...
  23. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    Download

    Hi, wanted to update the status of my project. I am still having troubles getting the download right. Much of my equipment is home built so there may be finger problems in all that but I am working...
  24. Thread: Forum searches

    by Tom H
    Replies
    2
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    405

    Forum searches

    Hi,
    My question is regarding search syntax. I want to search for "Mode $4E" to see if anyone had already worked with it/knows about it's function. Advanced search looks for Mode -OR- $4E. Since the...
  25. Thread: 1997 F-Body ECM

    by Tom H
    Replies
    93
    Views
    8,349

    To the best of my knowledge, the following...

    To the best of my knowledge, the following responses apply...


    "TRANSFER SUSPENDED\n", // 0x071
    "TRANSFER ABORTED\n", // 0x072
    "BLOCK TRANSFER COMPLETE / NEXT BLOCK\n", //...
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