94-95 lt1 16188051 $EE 3rd processor

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
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94-95 lt1 16188051 $EE 3rd processor

Postby jthompson122183 » Fri Oct 06, 2017 8:43 am

Hi Everyone
I need some help.
Some of you might know there is a 3rd processor in the 94-95 16188051 $EE pcm (not sure about 96-97 but more than likely). It is a Motorola, labelled D84G.
It`s main function that i can tell of is to decode opti signal, maf frequency, firing injectors and control spark timing.
The same processor is also used in sir and abs modules.
It has some internal rom memory, and share the same ram addresses with main processor, so they interchange data.
I am trying to find a dump of the rom memory or a way to read it.
Thank You For Your Time. JT

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Joined: Fri Feb 01, 2019 4:38 am

Re: 94-95 lt1 16188051 $EE 3rd processor

Postby Tom H » Fri Feb 01, 2019 4:47 am

Have a look at this patent and let me know if it seems similar in function to you.


I will be replacing the Eside code with monitor code to allow me to explore the part through it's parallel I/F


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