Fendt A.1.17 – A002 - ECU, enhanced control: Spool valve fault, valve 1 - Internal position sensor fault

The internal position sensor of the Y015 Auxiliary control valve (Valve 1, designated by the color yellow) fails or sends an invalid signal. As a safety consequence, the system forces the valve to move into the neutral position, and the valve's functions become unavailable.

• 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) / Farmer 400
• Fendt 700 Vario (COM III) / Favorit 700
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III) / Favorit 900

1. 1

   Inspect the wiring harness and Connector X326 (specifically pins 24 and 26) at the Y015 valve for corrosion, backed-out pins, or wire chafing

2. 2

   Verify CAN bus communication by ensuring the valve is communicating properly with the A002 ECU. Check the CAN II bus lines (Pins 4 and 5) for proper voltage and continuity

3. 3

   Check for oil contamination. Ensure the hydraulic oil is clean and the filters are in good condition, as contaminated oil can cause the main piston to stick

1. 1

   Depressurize the System

   Ensure the tractor is off, implements are lowered, and the hydraulic system is fully depressurized.

2. 2

   Locate the Valve

   Locate the Y015 valve on the central control block (ZSB). It is "Valve 1" and is color-coded yellow.

3. 3

   Disconnect

   Unplug the X326 electrical connector from the Y015 valve.

4. 4

   Remove the Valve Slice

   Unbolt the tie-rods holding the valve block assembly together and carefully remove the faulty Bosch SB 23 LS-EHS valve slice.

5. 5

   Install the New Valve

   Insert the replacement valve slice, ensuring the O-rings/sealing plates are properly seated. Torque the tie-rod bolts to the manufacturer specification (typically 30 Nm for the Bosch SB 23 system).

6. 6

   EOL Programming

   Reconnect the X326 connector. You must perform an End-of-Line (EOL) programming/teach-in procedure using the FENDIAS diagnostic tool or Variotronic TI terminal. If it is not programmed to Position 1, it will not be recognized on the CAN bus.