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Bosch MEVD17.2.3 - TC1793

Bosch MEVD17.2.3 - TC1793 FAQ

Bosch MEVD17.2.3 - TC1793

Errors

Find quick solutions to common errors encountered while working with the Bosch MEVD17.2.3 ECU.

Files not found

Occurs when the required virtual read file is missing from the server database.

View Solution →

7F-31-33 : UDS checkCodingSignature Rx error

A diagnostic error triggered when the ECU's coding signature validation fails during the write process.

View Solution →

UDS diagnosticSessionControl Rx error

Communication failure when the tool attempts to establish a secure diagnostic session with the ECU.

View Solution →

Concerns vehicles from

BMW Mini

Files not found

Method: OBD / Recovery: Bench

Issue: The user is attempting an OBD read, but the specific software version of the ECU is not available on the server.

Solution
  • Perform a full BENCH read of the control unit.
  • Export the resulting file.
  • Send the file via email to support@bflash.eu.
  • The technical team will process the file to add it to the server for future OBD access.
To understand more

Virtual reading relies on a pre-existing database of original files on the server. If your specific software ID has never been encountered before, a Bench read is required to capture the data directly from the processor so it can be indexed for the global user community.

7F-31-33 : UDS checkCodingSignature Rx error

Method: OBD

Issue: The ECU is rejecting the write command due to an inconsistency or lack of valid coding data during the flashing process.

Solution
  • In the bFlash software menu, navigate to the WRITE section.
  • Select the option labeled Apply coding.
  • Proceed with the flash to restore the correct coding signature to the unit.
To understand more

BMW/Mini ECUs often require a specific Coding Signature to be valid before they accept new software. By using the "Apply Coding" function, the tool ensures that the vehicle-specific configuration is correctly aligned with the modified firmware being uploaded.

UDS diagnosticSessionControl Rx error

Method: OBD

Issue: The communication between the tool and the ECU was interrupted or blocked when trying to enter programming mode.

Solution
  • Completely turn off the ignition of the vehicle.
  • Wait approximately 10-15 seconds for the modules to power down.
  • Turn the ignition back on and retry the flash operation immediately.
  • If the problem persists, Contact our technical support.
To understand more

The diagnosticSessionControl is a critical UDS (Unified Diagnostic Services) command used to switch the ECU into specialized modes. If the ECU is "busy" or stuck in a previous state, a power cycle (ignition off/on) resets the internal state machine, allowing a clean connection to be established.