Fendt 04.1.E6 – A002 - ECU, enhanced control / A050 - Basic control unit ECU: Incorrect checksum, load limit control parameters

Data stored in the control unit's EEPROM/memory regarding the load limit control has become corrupted or invalid, resulting in a checksum mismatch. The transmission will default to an emergency operating mode.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 300 Vario
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario
• Fendt 916
• Fendt 920
• Fendt 924
• Fendt 926
• Fendt 930

1. 1

   Verify Emergency Mode: Confirm that the transmission is actually in emergency mode, as this code forces the system to restrict standard transmission functions.

2. 2

   Check for Accompanying Codes: Look for other A002/A050 internal memory faults (such as 04.1.B2 EPROM programming faulty or 04.1.FF Internal fault RAM/EEPROM).

3. 3

   Verify Power Supply: Ensure the A002/A050 ECU is receiving proper voltage (KL30, KL15) and has a solid ground (KL31), as voltage spikes or drops can cause memory corruption.

1. 1

   Connect diagnostic tool

   Connect the tractor to the FENDIAS diagnostic system (or equivalent dealer-level AGCO diagnostic tool).

2. 2

   Perform EOL programming

   Perform EOL (End of Line) programming on the A002 / A050 control unit. This process rewrites the correct factory parameters (including the load limit control mapping) back into the ECU's memory based on the tractor's specific chassis number.

3. 3

   Clear fault codes

   Clear the fault codes from the memory.

4. 4

   Test tractor

   Cycle the ignition and test the tractor under load to ensure the load limit control functions normally (default setting is usually a 14% engine speed reduction allowance).

5. 5

   Replace or repair ECU

   If the EOL programming fails to write, or if the code immediately returns after a battery reset, the EEPROM inside the A002/A050 ECU is physically damaged and the control unit must be repaired or replaced.