TEST Broadcast Code

[Sleepy]

I have come across a memcal with the broadcast code of TEST. Does anyone know anything about this? Could it be a calibration for testing the ECM? Which ECM?

Thank you

[Six_Shooter]

Post a picture, I've never seen a BCC named "TEST".

[1project2many]

It could be a test calibration. There were bulletins released by GM about ecms coming out of the repair facility with the test memcals installed. I met a tech years ago who claimed to have gotten one. Is there a knock sensor board installed? I'd also love to see a picture. And maybe a read of the chip, too!

[Sleepy]

Attachment 9332
I will read the prom tomorrow. Is the ceramic hybid module the knock sensor board?

[Six_Shooter]

Yes, that is the knock filter board.

I'm interested in seeing what is on that TEST EPROM. :)

[Sleepy]

Should it be a 27c128?

[RobertISaar]

knock filter looks to have an ID code of B or 8?

i would just read it as a 27C512 and see if it needs split after reading. no P4 used a 27C512(that I'm aware of anyways, all of the P4 ECMs I've had in-hand have their highest address line connected to +5V, effectively limiting one to 256 chips or less of effective space).

then again, there were P6 units that used that kind of MEMCAL.

[Sleepy]

Here are the contents of the EPROM. The knock board says 1B4301. The two ICs under the knock board are 16061057 and 16061058.

[JP86SS]

What did it come out of?
0x0008 = 49 HEX for the Mask ID if that is the right location of it.
Attached pic of the area.
Jp

[Sleepy]

I have no idea what it is out of.

[RobertISaar]

PROM ID references to AFFB, 87 j-body with the turbo 2.0, which matches the B knock filter code.

unfortunately, I don't have any $49 BINs to compare it against.

[Sleepy]

Is there any harm in putting it in a 1227165 to see what happens? I'm running it on a bench.

[RobertISaar]

it's meant for a 1227749... it will kind of run in a 7165, but I get the feeling it isn't going to act quite how one would expect. I/O is going to be vastly different, so what would have controlled an EGR solenoid on one might be a fan output on another, stuff like that.

[Sleepy]

Is the 1227749 based on the AFFB? What address is it at? I'm new to these ECMs.

[1project2many]

Thanks for posting the picture and .bin file.

I believe I had a $49 at home. That was the first year turbo Sunbird 7749 code. Then it switched to $58. I'll have to look around later.

You could use the memcal for a 7165 if you remove the knock sensor board and reprogram the chip. You can plug it in to see what happens. Chances are the inputs / outputs will move. Look for the chart that shows inputs/output locations when using a 7730 with $58.