Fendt A.1.5F – A057 - ECU, steering controller (Auto-Guide): Internal fault

Critical module error where the controller's internal memory or processing has failed, often related to EEPROM data corruption or hardware failure.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 400 Vario COM III
• Fendt 700 Vario COM III
• Fendt 800 Vario COM III
• Fendt 900 Vario COM III

1. 1

   Check for related voltage fault code A.1.5E, which indicates the supply voltage to the A057 ECU has dropped below 10.1 VDC and can cause internal module faults.

2. 2

   Check for related EEPROM fault codes A.1.55 (EEPROM description fault), A.1.56 (EEPROM reading fault), or A.1.57 (Invalid EEPROM data).

3. 3

   Inspect the wiring harness and connectors at the A057 ECU (referencing circuit diagram sheet 39) to ensure the module is receiving stable power and ground.

1. 1

   EOL Programming

   Perform EOL (End of Line) programming by connecting the tractor to the FENDIAS diagnostic software and reflashing/reprogramming the A057 steering controller to restore its operating parameters.

2. 2

   Module Replacement

   If the EOL programming fails, cannot be completed, or does not remedy the fault (indicating a hard physical failure of the internal memory/processor), replace the A057 ECU box.

3. 3

   Recalibration

   If the module is successfully reprogrammed or replaced, restart the Auto-Guide steering valve calibration process.