Fendt A.1.25 – Enhanced Control ECU / Valve Bus: Spool valve fault, valve 2 — Overvoltage (> 45 volts)

The system has detected an electrical voltage exceeding 45 volts at the control circuit or internal electronics for spool valve 2 (Y016). As a safety measure, the valve automatically moves into the neutral position and locks out operation to prevent uncontrolled hydraulic movements.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt 300 Vario
• Fendt Farmer 409 Vario
• Fendt Farmer 410 Vario
• Fendt Farmer 411 Vario
• Fendt Farmer 412 Vario
• Fendt Favorit 711 Vario
• Fendt Favorit 712 Vario
• Fendt Favorit 714 Vario
• Fendt Favorit 716 Vario
• Fendt 815 Vario
• Fendt 817 Vario
• Fendt 818 Vario
• Fendt 828 Vario
• Fendt Favorit 916 Vario
• Fendt Favorit 920 Vario
• Fendt Favorit 924 Vario
• Fendt Favorit 926 Vario
• Fendt Favorit 928 Vario
• Fendt Favorit 930 Vario

1. 1

   Test the tractor's alternator output and battery voltage to rule out a failed voltage regulator sending high voltage through the system.

2. 2

   Inspect connector X327 (Valve 2) and the wiring harness for chafing, melted insulation, or crossed wires shorting a high-current line to the valve.

3. 3

   Check the power supply for the CAN bus located in circuit board A013, specifically verifying fuses F040 and F041.

4. 4

   Disconnect X327 from the Y016 valve, turn the ignition on, and probe the harness-side pins with a multimeter to verify if normal system voltage is present (indicating an internal valve circuit board failure).

1. 1

   Depressurize the System

   Turn off the tractor, lower all hydraulic implements to the ground, and cycle the hydraulic levers to relieve residual pressure.

2. 2

   Disconnect Power

   Disconnect the tractor's battery to prevent further electrical damage during the repair.

3. 3

   Remove the Valve

   Disconnect the X327 electrical connector from Valve 2 (Blue). Unbolt the hydraulic lines and remove the Y016 spool valve assembly from the hydraulic valve block stack.

4. 4

   Install the New Valve

   Mount the replacement valve, ensuring all O-rings and seals are properly seated and lubricated with clean hydraulic fluid. Torque the mounting bolts to OEM specifications.

5. 5

   Reconnect and Refill

   Reconnect the hydraulic lines and the X327 electrical connector. Top off the hydraulic fluid (Fendt Super Hyd or Extra Hyd 68) if any was lost.

6. 6

   EOL Programming

   Program and calibrate the new auxiliary control valve for 'Position 2' using the FENDIAS EOL (End of Line) diagnostic software.

7. 7

   Clear Codes

   Clear the A.1.25 fault code from the tractor's memory and test hydraulic functions.