How to Resolve Fendt 800 Vario S4 Wayline Tracking Slow or Delayed Response

If your Fendt 800 Vario S4 is oscillating along the wayline or aligning with it very slowly, several factors may be causing the issue. Use the following checklist and diagnostic steps to identify and resolve the problem.

Preparations

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Common Causes of Wayline Tracking Issues:

• IMU (Inertial Measurement Unit) calibration required

• Defective or miscalibrated steering valve

• Steering angle sensor not calibrated correctly

  • Ensure front wheels are in the exact straight-ahead position during calibration

• Incorrect steering system settings

  • See: Settings → Steering in the tractor menu

• Implement settings misconfigured

  • Refer to the implement’s user manual

• Inadequate front axle ballast or incorrect lower link stabilization setting

• Unequal tire pressure (left vs. right)

• Steering angle sensor clearance issue

• Front axle bearing clearance

• Inconsistent or insufficient pressure supply to the steering system

• Internal or external leakage in the steering system or cylinders

Step-by-Step Troubleshooting:

1. Eliminate Mechanical Defects or Wear:

Check the following components for physical wear or malfunction:

• Front axle (including clearance and axle center pin)

• Steering system (check for internal leaks)

• Steering angle sensor (ensure no play or damage)

2. Field Setup for Accurate Testing:

• Choose a flat, evenly worked field area for calibration and testing

• Use the most accurate correction signal available

• Ensure the system is fully booted and showing maximum bars for GPS and correction signal

• If possible, perform testing without an implement or ensure the implement is fully raised

Diagnostic and Calibration Process Using FENDIAS:

1. Record an A-B Wayline

   • Refer to the vehicle’s operating manual for detailed instructions

2. Launch FENDIAS Diagnostic Tool

3. Navigate to:

   • Diagnostics → Vehicle

4. Connect Diagnostic Adapter:

   • CAN1 = K-Bus (Comfort Bus)

   • CAN2 = G-Bus (Transmission Bus)

   • Confirm the connection with OK

5. In the top menu, go to:

   • Comfort → Differential Lock

6. Select:

   • Steering Angle Sensor Diagnostics (follow the on-screen arrow or menu)
     

7. Drive Along the A-B Wayline with automatic track guidance enabled, and monitor the steering angle sensor values
   

Steering Angle Sensor Value Analysis:

• Normal Range (Calibration OK):
  Value fluctuates between ±0.1° and ±0.4°

• Fault Condition:
  If the value exceeds ±3°, the automatic wayline guidance will deactivate and fault code 0E.1.A2 will appear on the instrument cluster

• Note:
  Sensor readings are mostly unaffected by the correction signal if the time between recording the track line and activating automatic guidance is less than 15 minutes

If Sensor Fluctuates > ±0.4°:

• Perform calibration code 2401

• Re-check for any mechanical defects or wear before proceeding