Fendt 18.1.07 – A050 ECU (Basic control unit) or A057 ECU (Steering controller): Y085 - Steering switch-off (Autoguide) solenoid valve

Signal fault or faulty steering wheel shut-off valve. This typically indicates a break in the electrical supply line to the pilot pressure solenoid valve, a short circuit to earth, or an internal failure of the solenoid itself. Automatic track guidance (Auto-Guide/VarioGuide) and suspension systems may be restricted or disabled.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III) (Models 919, 922, 924, 927, 930, 933, 936)

1. 1

   Inspect the electrical supply line to the Y085 steering valve for breaks or chafing.

2. 2

   Check the separation point/connector X1513 directly on the Y085 solenoid valve for corrosion, moisture, or loose pins.

3. 3

   Test the circuit for a High (A07) or Low (A78) signal fault and verify there is no short circuit in the earth of the voltage supply.

4. 4

   Refer to Fendt circuit diagram Sheet 9 or Sheet 39 (depending on chassis number) to trace the wiring back to the A050/A057 ECU before replacing parts.

1. 1

   Locate the Valve

   The Y085 solenoid valve is located on the right side of the transmission, integrated into the Auto-Guide steering valve block.

2. 2

   Access

   To gain proper access to the valve block, safely lift and support the tractor, then remove the right rear wheel and the right-side transmission panel.

3. 3

   Disconnect

   Disconnect the electrical connector (X1513) from the Y085 solenoid valve.

4. 4

   Replace

   Unbolt and remove the faulty Y085 pilot pressure/switch-off solenoid valve from the Danfoss Autoguide control block. Install the new solenoid valve and ensure the O-rings/seals are seated correctly.

5. 5

   Reassembly

   Reconnect the X1513 electrical connector, reinstall the side panel, and remount the right rear wheel.

6. 6

   Calibration/Clear Codes

   Clear the stored 18.1.07 fault code from the tractor's memory using the FENDIAS diagnostic tool or the tractor's MFA terminal, and test the Auto-Guide system.