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Odometer Algorithms Manual Calculations Explained For Studies
02-03-2018, 21:09 PM,
Post: #21
RE: Dash Algorithms Explained
Figured I would add this one, haven't posted here in a while. smile

Lincoln MKX 93c76

Files are calculated in Km so if you need Miles convert to Km first.

100,000.000 Km

0050: xx xx xx xx 0a 19 00 e1 f5 05 0a 19 00 e1 f5 05
0060: 0a 19 00 e1 f5 05 0a 19 00 e1 f5 05 0a 19 00 e1
0070: f5 05 0a 19 00 e1 f5 05 0a 19 00 e1 f5 05 0a 19
0080: 00 e1 f5 05 0a 19 00 e1 f5 05 0a 19 00 e1 f5 05
0090: 0a 19 00 e1 f5 05 0a 19 00 e1 f5 05 xx xx xx xx

First two bytes CS, last four mileage inverted to decimal = Km X 1000

00 e1 f5 05 inverted 05 f5 e1 00 to decimal = 100,000.000

CS set calculator to WORD f505+00e1 = f5e6 NOT 0a19

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03-06-2018, 15:05 PM, (This post was last modified: 03-06-2018, 15:07 PM by Clusters.)
Post: #22
RE: Dash Algorithms Explained
Alrighty, if you do this next one manually, you are a sucker for punishment as there can be a couple of hundred lines to edit. rolling

This is a better one to do with scripts because of the time involved but thought I would post it so people could understand how it works.

Fujitsu processor found in a lot of newer cars, haven't verified on a whole lot of them but some Toyota and Hyundai use the same algo. I also didn't check to see if the mileage is in the same lines in each processor.

When looking at an original file you will see the mileage is a different value in most lines, as the processor counts up, but when editing it the mileage values can all be the same.

Refer to the pic below of 10000 Km.

First off, 0x22-0x23 is 06a6, which is our constant of 06a4 + 02 (0x26-0x27)

Now to the calculation, and this will be referring to line 0x30 only. The mileage is in straight decimal as at 0x34-0x37, which is the easy part.

The bytes at 0x30-0x31 are not edited and the CS (0x32-0x33) is calculated as follows....

The CS is our constant of 06a4 plus each other byte in the line (0x30-0x31 and 0x34-0x37)

0x30: 00 02 CS CS 00 01 00 00: CS = 06a4 + 00 + 02 + 00 + 01 + 00 + 00 = 06a7

That gives us a corrected line of: 0x30: 00 02 06 a7 00 01 00 00, now just up to a couple of hundred more. wink

Have fun with this one. biggrin


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20-07-2018, 11:06 AM, (This post was last modified: 20-07-2018, 11:35 AM by Crysis05.)
Post: #23
RE: Dash Algorithms Explained
my solution of DCM3.4
---------------------------------------------------------------------------------
Vin:VF1KW05B545040074
K m : 325791 km
Err 1: 325779 km
Err 2: 325700 km
Err 3: 0 km
---------------------------------------------------------------------------------
1. search all hex values contains 04F89F
2. change mileage Hex TO dec 04F89F -> 325791 km


3. change mileage dec TO hex 246791-> 03C407



4.Replace values 04F89F to 03C407 in all founded places
5. change km to 246791 km in all founded places
04F89F= 325791 km
04F893 = 325779 km
04F844 = 325700 km

and Replace Values 04F893 to 03C407
Values 04F844 to 03C407

Coriction crc New Milage 246791 km ok !!!!
car start

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25-07-2018, 20:00 PM, (This post was last modified: 14-12-2019, 21:53 PM by Crysis05.)
Post: #24
RE: Dash Algorithms Explained
DFSK CHINA

CHANGE KM DACH

°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

OLD :108282  km
NEW :068210 km

°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
108282 KM

hex 01 = 01 dec
hex 08 = 08 dec
hex 1c = 28 dec
hex 15 = 21 dec

01 08 28 21 = 0108282.1 km
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
068210 KM

hex 00=00 dec
hex 44=68 dec
hex 15=21 dec
hex 00=00 dec


0.068210.0

°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

hex 3c = 60 dec
hex 35 = 53 dec

605.3 m

A great greeting to the esteemed Clusters

===============================================

milage chery QQ. 2015-2016-2017-2018

Atmega 16A

OLD MILAGE:66173 km
new MILAGE:15200 km
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°
ORI 66173 KM
00000000: 0335 3508 2303 3535 0823 0661 7308 2537
00000010: C813 8609 0335 3508 2303 3535 0823 0661
00000020: 7308 2537 C813 8609 FA03 1386 09FA 0659

37=CRC = 03+35+35+08+23+03+35+35+08+23+06+61+73+08+25=237

37 XOR  = C8
CRC 37Č8 :-D


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14-08-2018, 22:11 PM, (This post was last modified: 11-09-2018, 22:38 PM by volavka.)
Post: #25
1111111111
This Method how To change Peugeot 308 2012 with Continental Dash 93C66.
for exaample 50.000

Now come on to calc the km in the Dash manually

50.000 *10 = 500000 to hex 07A120 > swap = 20A107 xor FFFFFF = DF5EF8

now replace the 1st/2nd value in column 1 20A107 and column 2 DF5EF8

0x00: 0C A2 20 A1 07 00 DF 5E F8 FF 20 A1 07 00 DF 5E F8
0x10: FF 20 A1 07 00 DF 5E F8 FF 20 A1 07 00 DF 5E
0x20: F8 FF 00 00 00 00 00 00 00 00 00 01 09 01 F8 00

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15-08-2018, 13:19 PM, (This post was last modified: 03-09-2018, 00:52 AM by volavka.)
Post: #26
[split] TOYOTA Techstream V13.00.022 (02/2018) + Activation
I hope this can be easy to understand
1) set to window calculator to hex
2) enter kilometer value
3) xor to FFFFFF


[Image: denso_zpsnrmzhrmv.jpg]

Algo used for Hyundai Accent, Porsche 991/997, old benz and others

[Image: VDO_zpsbkcbagc9.jpg]
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02-09-2018, 00:50 AM,
Post: #27
RE: Dash Algorithms Explained
Tata zeta with eeprom 93c56

dec 100.000km /16 = 6250 to hex 186A xor FF FF = E795 invert byte = 95E7

Km begins from line 0x00 till 0x01f

Good luck

Next algo plz biggrin

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11-09-2018, 21:46 PM, (This post was last modified: 15-09-2018, 15:14 PM by volavka.)
Post: #28
RE: Odometer Algorithms Explained For Studies
Passat B6 Dash VDO with eeprom 24c32 Explained algorithm

Set windows Calc to [Qword]
dec 290000km /32 > 9062 > Hex 2366 xor FFFF = DC99 > swap byte 99DC ;
Well 99DC is first 2 byte
Now select [Word] and push Rol 33B9 (2nd 2 bytes ) > Rol again 6772 (3rd 2 bytes), Rol again and again untill reach end km string ;

0x800: .FF FF FF FF FF FF 00 00 7C 7C 28 39 99 DC 33 B9
0x810: 67 72 CE E4 9D C9 3B 93 77 26 EE 4C DC 99 B9 33
0x820: 72 67 E4 CE C9 9D 93 3B 26 77 4C EE 00 FF FF 77

Now Correct crc in CDC3272G

Here an example https://cartechnology.co.uk/showthread.p...#pid370750

Good luck

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17-12-2018, 01:07 AM, (This post was last modified: 17-12-2018, 01:12 AM by Clusters.)
Post: #29
RE: Odometer Algorithms Explained For Studies
Here is an oldie but a goodie, and I have not seen many successful corrections for these because it is a bit weird to calculate.  thinking  This is a tested and successful algorithm. wink2

This is from Holden Commodore VS 24c44, but applies to older GM with 24c44 with only 32 bytes of data in the file.  The first 8 bytes are ignored, the mileage is repeated 3 times for the last 24 bytes.

Calculating mileage to hex string is all done in hex.  First word is checksum last three are mileage.  Each byte is followed by it's xor.  Calculate these first, then use the table below to convert them (don't get confused with xor, the conversion table is different).  Then swap the nybbles, ex:6c 93 becomes c6 39


123,456Km  (file attached)

CS: 12+34+56 = 9c with xor first CS = 639c
CS/Mileage....639c 12ed 34cb 56ac
Converted.....6c93 847b c23d a653
Nybble swap..c639 48b7 2cd3 6a35  

Conversion table:
0=0
1=8
2=4
3=c
4=2
5=a
6=6
7=e
8=1
9=9
a=5
b=d
c=3
d=b
e=7
f=f

Have fun.   enjoy


Attached Files
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Size: 186 bytes


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03-01-2019, 07:47 AM,
Post: #30
RE: Odometer Algorithms Explained For Studies
BMW E36 / Z3 Odometer Algorithm until 2000

228.608 KM:

17E4 SWAPPED E417 xor FFFF = 1BE8 dec = 7144 x 32= 228608

another example (10.000KM):

C7FE SWAPPED FEC7 xor FFFF = 138 dec = 312 x 32 = 9984 KM
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