411 PCM (and possibly others) memory blocks

American GM ECUs and PCMs
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411 PCM (and possibly others) memory blocks

Postby dzidaV8 » Fri Sep 01, 2017 5:41 am

Hello,

I've made some research into modes $3B and $3C - Write/Read Data Block

Maybe some of you know what are the unknown (???) blocks for?

Here's what I've found so far:
Code: Select all
LS1 Memory blocks (3C and 3B commands):
00 - N/A
01 - VIN 1 (ASCII)
02 - VIN 2 (ASCII)
03 - VIN 3 (ASCII)
04 - HDW No. (UINT32)
05 - Serial No 1 (ASCII)
06 - Serial No 2 (ASCII)
07 - Serial No 3 (ASCII)
08 - calibration ID (UINT32)
09 - N/A
0A - OS ID   (UINT32) = Operating System ID
0B - 9358638  (UINT32) = Engine Calibration ID
0C - 9362622  (UINT32) = Engine Diagnostics ID
0D - 9358280  (UINT32) = Transmission Calibration ID
0E - 16264369 (UINT32) = Transmission Diagnostics ID
0F - 16264667 (UINT32) = Fuel System ID
10 - 9373553  (UINT32) = System ID
11 - 9359140  (UINT32) = Speedometer ID
12 - N/A
13 - N/A
14 - Broadcast Code (BCC) (ASCII)
15 : 40 - N/A
41 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
42 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
43 - 0x00 0x00 0x00 0x00 0x00 ???
44 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
45 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
46 - 0x00 0x00 0x00 0x00 0x00 ???
47 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
48 - 0x00 0x00 0x00 0x00 0x00 0x00 ???
49 - 0x00 0x00 0x00 0x00 0x00 ???
4A - N/A
4B - N/A
4C - N/A
4D - 0x00 0x00 0x00 0x00 0x00 0x00 ???
4E - 0x00 0x00 0x00 0x00 0x00 0x00 ???
4F - 0x00 0x00 0x00 0x00 ???
50 : 6C - N/A
6D - 0xD7 ???
6E - N/A
6F - 0x00 0x00 0x00 0x00 0x00 0x00 ???
70 - 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF ???
71 - 0xFF 0xFF 0xFF ???
72 - N/A
73 - 0x00
74 - BC 00 39 56 ( value from 0x6014 ) ???
75 : 7F - N/A
80 - 00 22 1D 57 04 60 ( value from 0x6050 ) ???
81 - 00 ???
82 - 0xFF 0xFF 0xFF 0xFF ???
83 : 92 - N/A
93 - 0x41 0x42 (ASCII) (AB - OS level)
94 - 0x41 0x42 (ASCII) (AB - eng cal level)
95 - 0x41 0x48 (ASCII) (AH - end diag level)
96 - 0x41 0x46 (ASCII) (AF - trans cal level)
97 - 0x42 0x46 (ASCII) (BF - trans diag level)
98 - 0x41 0x45 (ASCII) (AE - fuel system level)
99 - 0x41 0x42 (ASCII) (AB - veh system level)
9A - 0x41 0x59 (ASCII) (AY - speedometer cal level)
9B : 9F - N/A
A0 - 0x00 (MEC - Manufacturer Enable Counter)
A1 : FF - N/A

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Re: 411 PCM (and possibly others) memory blocks

Postby antus » Fri Sep 01, 2017 12:50 pm

Here is a couple:

Code: Select all
6D = Time before oil change, FF=just serviced, 00=Change oil now.

41,42,43 = Auto gear 1 shift pressure modifier table
44,45,46 = Auto gear 2 shift pressure modifier table
47,48,49 = Auto gear 3 shift pressure modifier table

4D,4E,4F = Another auto modifier table (?)
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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