Help identifying ECU/Mods?

[peteb]

Thank you for all the detail - I'll start digging in and checking out some of these areas out! I'm really more concerned with finding something that can replace what I'm looking at in front of me, and keep the car running... I took a few more pictures if it's any help. I backed up what was on the chip with an eprom reader but wasn't sure what this other chip was, or if I can somehow pull this info into a standard memcal (copy it so I don't have this one custom made memcal thing.... On the main module, some of the chips are marked prototype...so that's a bit concerning too...but I do have another module, part 16198267. Would it be safe to swap the memcal into it, or I need to account for all this custom stuff? Just getting into the whole efi scene.

Pete

[1project2many]

I am thinking the parts in the first picture are a handmade version of a memcal. You might be able to use information on this page to help figure out how that circuit is wired. If you do, I'd love to hear more.

There are more pieces here: http://www.gearhead-efi.com/Fuel-Inj...your-Memcal-ID
Some of the links in the above thread are broken now. The exatorq link brought you to the schematics I posted earlier. Diy-efi.org is an old mailing list. You can follow the thread mentioned here. Also note the picture of the prototype ZR1 Corvette memcal. The ZR1 used an engine designed by Lotus and what we can see of the memcal in the photo looks very much like what you have.

I have found a better archive of Ludis site (where the schematics I linked originated).
https://pcmhacking.net/ludis/1227749schematic.html
This archive contains the schematics for ecm's similar to the 8707. It's been years since I've dug into this so I would have to look at notes on another pc to be of more help.

At least you have more information, although it may be more distraction than help. The question is "What can replace this controller I am using." My hunch is that a later stock 8707 will be the correct replacement. The reason for all the additional work is to try and help devise tests to prove or disprove the 8707 will work.

Also, if you have read the calibration we may be able to compare the mask ID with a stock file from a later vehicle to see if it is the same. Same mask id indicates most likely they used the same ecm.

[peteb]

OK, digging into more now... Is there a way to analyze the EPROM data I have? Just curious where I would find that data from the chip itself..is there a specific location I would look in the data?

Great stuff...checking the links now! Thank you for assisting!

Pete

[1project2many]

The typical file begins with calibration data. There is a program ID known as the Mask ID which can be found at location $0008. If your chip has a mask ID other than $AA we may be able to determine which program was used. This would be a big step in determining whether or not a stock ecm could easily replace it.

[peteb]

I have the file, just trying to figure out how to track it down... I tried an online tool and it couldn't find the mask...poking around in my eprom programmer buffer now to find it...

Pete

[1project2many]

Location is the eighth byte after the first. Could be C008, 0008, You could load the definition into Tunerpro with one of the $0E definitions and it will show the mask ID.

[peteb]

Location is the eighth byte after the first. Could be C008, 0008, You could load the definition into Tunerpro with one of the $0E definitions and it will show the mask ID.

I think I'm doing this right..loaded an xdf of 0E_tpv4_v200.xdf (any reason for using $0E definitions?) in tunerpro, opened my bin and got:

PROM ID: 18976
Platform ID (MSW): 1C86
Platform ID (LSW): FFFB7
Checksum: 018E
Mask ID: B6

Pete