93c56pi 0430E in speedometer

[bruce]

Hi everyone,

I am trying to find 140787 kms in the file
In hex the value is 225F3 but I did not see this value
I need to use 93..56 series (8 bits or 16 bits)? on the menu to select the correct chip?

[ArT]

Hi Bruce.
In 99% cases it will be 16-bit.
Sometimes it may be swap byte required (it depends on how data is stored in eeprom for microprocessor - MSB or LSB first)

You need to know how mileage is stored in eeprom, because usually it is encoded.
Which car is it? You can try to find information on some automotive forums or dedicated tool (mileage calculator).

225F3 => 02 25 F3
it may be also FFFFFF - 0225F3 = FD DA 0C but it is to easy to be true and in most cases it is encoded.
Please note that this number is only for kilometers, but mileage in instrument cluster is stored with meters precision or as number of impulses counted from hall sensor.

[bruce]

Hi Artur,

Thank you for your reply
This picture is the pic of the microprocessor if I guess well.


Before I removed the odometer on the car, I remember the mileage was 140787 kms
Its a Mitsubishi Lancer evo IX jdm.
Do you know the name of mileage calculator?

[ArT]

I asked friend and mileage is coded in 0x00 - 0x5F and it is 16 bit 93c56 eeprom.
These repeated values 0B 74 is encoded mileage in your case.

You can try to change all 0B 74 (stored in adresses 0x00-0x5F) to other value and you will change mileage, but you will need mileage calculator to can set required value. Please look for "Tachosoft mileage calculator 23.1"

[bruce]

Hi Art,

I succeeded with tachosoft mileage value.
but have a mistake in tachosoft mileage software, the value not work for my car, I used the calculator for another model with the same brand of car and It worked.
With Revelprog-IS can I write and read a chip 27SF512?

[ArT]

That's great it worked. 27xx (and generally other parallel devices) are not supported - only serial devices.