Fendt 0B.1.B1 – A050 - ECU, basic control unit: Saving or read-out error in sequence data

The tractor's computer is unable to properly save or retrieve the automated sequence steps programmed into the Variotronic TI (Teach-In) Headland Management System.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III and SCR models)
• Fendt 800 Vario (COM III and SCR models)
• Fendt 900 Vario (COM III and SCR models)

1. 1

   Call up the fault code on the tractor's multiple display/terminal to confirm it is active.

2. 2

   Attempt to manually trigger or record a new sequence in the Variotronic TI menu to see if the system rejects the input or fails to save.

3. 3

   Look for accompanying A050 codes (such as 0B.1.B2 or 0B.1.B0) to determine if the issue is isolated to a corrupted sequence file or if the ECU's memory chip (EEPROM) is physically failing.

1. 1

   Delete the Sequence

   Access the Variotronic TI (Teach-In) menu on the tractor's terminal and completely delete the saved headland management sequence that is causing the read/write error.

2. 2

   Reprogram the Sequence

   Re-record (reprogram) the sequence data from scratch.

3. 3

   Clear the Fault Code

   Clear the stored fault code from the instrument panel memory (using the terminal buttons) or via the FENDIAS diagnostic software.

4. 4

   ECU EOL Programming

   If the error immediately returns, or if the ECU is suffering from a deeper memory failure (EEPROM error), the A050 Basic Control Unit will require an EOL (End of Line) software re-flash using the FENDIAS diagnostic tool.

5. 5

   ECU Replacement

   If EOL programming fails and the unit can no longer retain memory, the A050 ECU must be removed, sent out for board-level repair, or replaced entirely.