Fendt A.1.1A – A002 - ECU, Enhanced Control: Spool valve fault, valve 1 — Main piston deflected too far.

The internal position sensor of the electro-hydraulic spool valve has detected that the main piston has traveled beyond its maximum allowable physical range. As a direct safety consequence, the system forces the valve to move into the neutral position to prevent uncontrolled hydraulic functions.

• 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 Farmer 400 series
• Fendt Favorit 700 and 900 series
• Fendt 300, 400, 700, 800, and 900 Vario (including COM III generations)

1. 1

   Check hydraulic oil and filters for contamination or metal shavings

2. 2

   Test hydraulic control pressure at test port M5 (a drop below 22 bar can cause erratic behavior)

3. 3

   Inspect the diaphragm accumulator and the RV7/FP valve for proper operation

4. 4

   Verify wiring harness and connectors at the Y015 valve and the A002 ECU (CAN II pins 4 and 5) to rule out voltage or communication drops

1. 1

   Relieve Pressure

   Safely shut down the tractor and relieve all hydraulic pressure from the system.

2. 2

   Inspect the Valve

   Locate valve Y015 on the central control block (this is Valve 1, which is typically color-coded yellow on the remote couplers).

3. 3

   Flush the System

   If diagnostic checks revealed metal shavings or debris in the hydraulic oil, the system must be flushed and filters replaced, or the new valve will suffer the same fate.

4. 4

   Replace the Valve

   If the control pressure is normal and the oil is clean, the internal mechanical structure or the internal position sensor of the Y015 valve has failed. Remove the retaining bolts, disconnect the electrical harness (Connector X326), and remove the Y015 spool valve. Install the replacement valve and torque to OEM specifications.

5. 5

   EOL Programming

   The auxiliary control valve must be programmed for its specific position (Position 1) using the FENDIAS diagnostic tool via the EOL (End-of-Line) program.

6. 6

   Test Operation

   Clear the A.1.1A fault code from the A002 ECU memory and test the hydraulic remote for proper deflection and return-to-neutral functionality.