Possible to read eeprom/flash data of Mercedes Benz CRD3.40 ECU with pcmtuner?
Yes, via module 52 BSL mode.
pcmtuner pinout for delphi crd3.4 in bsl
Direct Connection
BOOT & CNF1 CONNECTION
Connect the BLUE and GREY wires of the cable F32GN037C as shown here below:
WARNING If instead of the 14-pin component, used for CNF1 signal, it is present a 8 pins component, the CNF1 connection must NOT be carried out, it is necessary the BOOT connections ONLY.
Check: pcmtuner module 53 BSL instruction
Flex and Foxflash can do it on bench but if written wrong file and do it in boot. If you cannot do in BSL then not possible to recover eeprom/flash.