Fendt A.1.66 – A057 - ECU, Steering Controller (Auto-Guide): Y087 - Steering valve block, Auto-Guide

The wiring of the position sensor within the steering valve is either broken (open circuit) or short-circuited.

• 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 300 Vario (COM III)
• FENDT 400 Vario (COM III)
• FENDT 700 Vario (COM III)
• FENDT 800 Vario (COM III / S4)
• FENDT 900 Vario (COM III / S4)

1. 1

   Visually and electrically inspect the wiring harness leading to the position sensor on the Y087 steering valve block for chafed wires, broken connections, or pinched harnesses.

2. 2

   Disconnect and inspect the electrical connectors at the steering valve and the A057 Steering Controller for corrosion, bent pins, or moisture ingress.

3. 3

   Test the position sensor on the steering valve for proper resistance/continuity to verify if the internal sensor has failed.

1. 1

   Repair Wiring

   If a break or short circuit is found in the harness during the diagnostic phase, repair the wiring or replace the affected harness section. Clear the codes and test the system.

2. 2

   Replace Steering Head

   If the wiring and connectors are intact and the fault is isolated to the sensor itself, check the steering valve, or replace the steering head.

3. 3

   System Calibration

   If the steering valve or steering head is replaced, recalibrate the Auto-Guide system (enter calibration code '2403' in the terminal to initiate the procedure).