Fendt A.1.3F – A002 - ECU: Y017 - Auxiliary control valve, position 3 (red) / Spool valve fault on valve 3

Fault indicates a spool valve fault on valve 3 due to missing or implausible setpoint/configuration messages, a potentiometer or PWM fault, or a Valve CAN BUS error. Consequently, the valve is locked and automatically moves into the neutral position to prevent uncontrolled hydraulic functions.

• 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
• Farmer 400 Series: 409, 410, 411, 412
• Favorit 700 Series: 711, 712, 714, 716
• Favorit 900 Series: 916, 920, 924, 926, 930
• Vario COM III Series: 300 Vario, 400 Vario, 700 Vario, 800 Vario, 900 Vario

1. 1

   Check CAN Bus Power Supply: Verify voltage supply for the CAN Bus on printed circuit board A013 by checking fuses F040 and F041.

2. 2

   Inspect Wiring and Connectors: Check the wiring harness and connector X328 (pins 24, 26) at the Y017 valve for corrosion, broken wires, or loose connections.

3. 3

   Test the Signal: Verify the potentiometer and PWM signals at the valve connector to determine if the issue is wiring/ECU related or internal to the valve.

4. 4

   Check for Related Codes: Look for codes like A.1.30 (Valve not registered on CAN bus) or A.1.31 (Electronics in valve faulty) to isolate communication versus hardware failures.

1. 1

   Access the Valve Block

   Locate the Y017 valve (Valve 3) on the central control block. On some models (like the Favorit 900), unscrew the right step and pull the right auxiliary tank outwards to access the 1st control valve on the underside of the block.

2. 2

   Resolve Wiring Issues

   If diagnostic checks revealed a blown fuse (F040/F041) or a damaged wire at connector X328, repair the wiring harness or replace the fuse, then clear the codes and retest.

3. 3

   Replace the Valve

   If the wiring and CAN bus supply are intact but the setpoint/configuration messages remain missing (indicating internal electronic failure), replace the Y017 auxiliary control valve.

4. 4

   EOL Programming

   Calibrate and register the new valve to the CAN bus using FENDIAS diagnostic software in the EOL (End of Line) program so the A002 ECU recognizes it as Valve 3.