Fendt 0B.1.43 – A050 - ECU, basic control unit / A039 (or A100) - MFA, multifunction armrest: Saving or read-out error between MFA and TEACH-IN

There is a memory, communication, or data-saving failure between the multifunction armrest and the tractor's basic control unit regarding the Teach-In system. The system is unable to properly save or read the automated sequence data programmed by the operator.

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

1. 1

   Verify CAN Bus Communication: Check for accompanying bus fault codes (e.g., 0B.1.23 or 0B.1.25) which indicate a physical wiring or connector fault rather than a memory error.

2. 2

   Inspect Wiring and Connectors: Check the wiring harnesses and connectors between the A039/A100 Multifunction Armrest and the A050 Basic Control Unit for corrosion, backed-out pins, or chafing.

3. 3

   Adapter Box Testing: Use the Fendt 160-pin adapter box to test the A050 and A039/A100 modules to verify proper power (+supply), ground, and CAN bus integrity.

4. 4

   Clear and Retest: Attempt to delete the Teach-In sequence data from the terminal and see if the error returns when creating a new sequence.

1. 1

   Connect diagnostic software

   Connect the tractor to the FENDIAS diagnostic software using the AGCO CANUSB diagnostic interface.

2. 2

   Navigate to programming

   Navigate to the programming section for the A050 Basic Control Unit and the A039/A100 Multifunction Armrest.

3. 3

   Perform EOL programming

   Perform an EOL (End-Of-Line) programming procedure to re-flash and re-initialize the memory parameters for the Teach-In system.

4. 4

   Evaluate EOL programming results

   If the EOL programming fails or the code immediately returns, the internal EEPROM/RAM within the A050 ECU or the A039/A100 armrest has likely failed.

5. 5

   Repair or replace defective module

   In the event of a hardware failure, remove the defective module (A050 or A039/A100) and either send it to a specialized agricultural electronics repair facility (such as Ilgenfritz Mechatronics) or replace it with a new OEM unit.

6. 6

   Program new ECU

   If a new A050 ECU is installed, it will require a complete EOL programming and calibration of all tractor systems (transmission, suspension, EHR, etc.) via FENDIAS.