Fendt A.1.6B – A050 - ECU, basic control unit / A057 - ECU, steering controller (Auto-Guide): Steering actuator cannot reach neutral

The steering actuator cannot reach neutral during operation, triggered by a mechanical fault on the steering actuator or a failure of the internal position sensor.

• 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 200 Vario V / F / P
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III, SCR)
• Fendt 800 Vario (COM III, SCR)
• Fendt 900 Vario (COM III, SCR, S4)

1. 1

   Verify if the steering actuator is mechanically binding or stuck, preventing it from returning to the neutral position.

2. 2

   Check the wiring of the position sensor on the steering valve block (Y087) for breaks or short circuits.

3. 3

   Verify the electrical supply line to the steering valve (voltage should be between 10V and 32V).

4. 4

   Attempt to recalibrate the Auto-Guide steering valve using the tractor's terminal, as it may simply be out of calibration.

1. 1

   Center the Steering

   Bring the steering wheel to the center position and ensure the front wheels are pointing exactly straight ahead. Apply the handbrake.

2. 2

   Run Calibration Code 2403

   Access the terminal's 'Setting and Calibrating' menu for the Overall System / Tractor. Enter calibration/adjustment code 2403 and start the calibration process. Do not touch the steering wheel and do not leave the driver's seat. If successful, 'OK' will appear; turn the ignition key to '0' and wait at least 15 seconds before turning it back on.

3. 3

   Address Mechanical Failures

   If the calibration fails (displays 'ERROR') or the A.1.6B code immediately returns during operation, the mechanical fault is hard-set.

4. 4

   Replace the Valve Block

   Disconnect the hydraulic lines and the CAN-bus electrical connectors from the Y087 steering valve block. Remove the defective valve block and install the replacement unit.

5. 5

   Post-Repair Calibration

   After installing a new steering valve block, rerun calibration code 2403 to teach the new valve to the tractor's ECU.