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Type: Posts; User: NeilBreakwell

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    Thanks again for the input. I think I have seen...

    Thanks again for the input. I think I have seen a few places which suggest that the module illuminates the check engine lamp.
    Will know for sure when I finish my test rig and check what the ECM...
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    @1project2many Thanks - that's really helpful....

    @1project2many

    Thanks - that's really helpful. My Firebird manual says the same - so it seems that the module causes the ECM to do more than just switch on the Check Engine lamp, but actually...
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    Hey thanks for that ... At least now I know that...

    Hey thanks for that ...
    At least now I know that it is some kind of timer, I get a few more results from Google searching for "E Cell Timer"

    If I searched "E Cell Program Modifier", I just got...
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    E-Cell Program Modifier

    Just getting to know all the sensors and actuators connected to the ECM on my '83 Trans-Am (LU5 crossfire) and I find a small module which the Service Manual identifies as "E-Cell Program Modifier". ...
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    I'm not convinced that it is a 6802 either :( ...

    I'm not convinced that it is a 6802 either :(

    Looking at the PCB, pin #5 is connected to pin #1 (which is ground).
    However, pin #5 is an output ('VMA') according to the 6802 datasheet.
    So unless...
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    13686 from...

    13686

    from http://www.chipsetc.com/computer-chips-inside-the-car.html
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    pinout that I found for 68HC09 seems...

    pinout that I found for 68HC09 seems significantly different from that shown for 16021633 here:
    https://pcmhacking.net/ludis/c3pinouts.html#16021633

    closest match that I have seen so far from...
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    Many thanks for that ... are you saying that the...

    Many thanks for that ... are you saying that the micro is equivalent to a 6805 ? Can't actually find a pinout for that part number in this document though.
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    13676136771367813679

    13676136771367813679
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    Thanks, 1project2many - that is a great help. I...

    Thanks, 1project2many - that is a great help. I had been looking at the pinout for the 16021633 IC, which I found here:
    https://pcmhacking.net/ludis/c3pinouts.html#16021633

    and concluded that it...
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    On it ... but first will remove some of the odd...

    On it ...
    but first will remove some of the odd "gunk" that appears to be spread around a couple of the ICs. There are actually two back-to-back boards in this unit. One has the connectors and...
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    Thanks for the advice - it is much appreciated. ...

    Thanks for the advice - it is much appreciated.

    However, my goal is really to understand the ECM in my car down to the level of the firmware, rather than to tune or tweak it. So I guess I am...
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    Thanks, guys ... @stew86MCSS396 ... Does the...

    Thanks, guys ...

    @stew86MCSS396 ...
    Does the "program ID" in this link ($0F) refer to the PROM mask ID ?

    @1project2many ...
    forgive my ignorance, but what is the "7747" and "7427" that you...
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    1226026 - Crossfire

    Hi, Guys -
    Just starting to learn about the fascinating world of GM ECMs ...

    Have a 1983 Trans-Am with the 305 Crossfire engine.

    ECM ID number is 1226026 and PROM has the following markings on...
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    New Member in UK

    Thanks for completing my registration. Looking forward to learning and sharing knowledge.
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