Mercedes EDC17C66 ECU Write & Checksum: PCMFlash vs Foxflash

 PCMFlash vs Foxflash which to read and write Mercedes EDC17C66 ECU?

Model example:

Mercedes V-Class 2.2CDI 2015

PCMFlash:

Read over OBD ok, Write via OBD ok, checksum no.


Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK
Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK
Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK

Foxflash:

Bench read ok, bench write ok, checksum by foxflash.


Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK
Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK
Benz EDC17C66 PCMFlash Checksum Failed_Foxflash OK

Check your cars for previous ecu change before doing anything, it can cost you couple of hours to resolve a simple issue. The car was tuned from someone else, and it had a different checksum, when i did a read i forgot to uncheck the checksum check which after read couldn’t do a correct checksum and that’s why the car didn’t want to start. Later i tried to flash ECU with Launch X431 PAD V with original file, but still the same. After that i flashed the file i took out from the car, took out the ECU and did it on bech with Foxflash and corrected the checksum with Winols for the whole file. Which resolved the problem.

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