Fendt A.1.4C – Enhanced Control ECU (A002): Spool valve fault, valve 4 (Y018)

Floating position has been set manually or deflected manually without result. This often triggers when the operator manually forces the spool valve into the float position rather than using the electronic controls.

• 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 Vario
• Favorit 700 Vario
• Favorit 900 Vario
• 300 Vario series (COM II and COM III)
• 400 Vario series (COM II and COM III)
• 700 Vario series (COM II and COM III)
• 800 Vario series (COM II and COM III)
• 900 Vario series (COM II and COM III)
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario

1. 1

   Verify if the operator physically forced the valve into the float position manually

2. 2

   Check fuses F040 and F041, and circuit board A013 for CAN bus power supply

3. 3

   Verify supply voltage at the Y018 valve connector is between 8V and 18V

4. 4

   Check control pressure at measuring point M5 and inspect the diaphragm accumulator

5. 5

   Inspect hydraulic oil for contamination that could cause the main piston to jam

1. 1

   Clear and Retest

   Clear the A.1.4C code using the tractor's terminal or FENDIAS diagnostic tool. If the code was triggered by a manual override, it may not return.

2. 2

   Access the Valve Block

   If the valve is physically jammed or unresponsive, access the Y018 valve. It is the 4th auxiliary control valve (color-coded green).

3. 3

   Remove Obstructions

   On models like the 900 Vario, the valve is located on the underside of the central control block. To access it, unscrew the right step and pull the right auxiliary tank outwards.

4. 4

   Inspect/Replace the Valve

   Remove the Y018 spool valve. Inspect it for mechanical binding or severe oil contamination. If the internal position sensor or magnet output stage has failed, the entire spool valve section must be replaced.

5. 5

   EOL Programming

   If a new auxiliary control valve is installed, it must be programmed for 'position 4' using the Fendt EOL (End of Line) diagnostic software so the ECU recognizes its location on the valve block.