Communication mode with the electronic control unit in which the ECU
system is started in a particular operating mode; this allows performing
operations normally not possible in serial communication (for ex. read the
original file, read/write the EEPROM memory, etc.). Usually performed on
the bench, as it is often necessary to bring suitable voltages on certain pin of
the ECU board (for ex. Soldering wires on some programming pads).
Set of communication protocols used by K-TAG to dialog with engine control
units communicating in a similar manner.
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