Fendt A.1.1F – A002 - ECU (Enhanced Control Unit): Spool valve fault, valve 1

The system reports that the 'Setpoint message is missing or not plausible' or the 'Configuration message is missing or not plausible'. This indicates a communication or electrical failure at the valve, typically caused by a CAN-BUS error, a potentiometer fault, or a PWM signal failure.

• 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
• COM III Generation Vario 300 series
• COM III Generation Vario 400 series
• COM III Generation Vario 700 series
• COM III Generation Vario 800 series
• COM III Generation Vario 900 series
• 412
• 716
• 818
• 920
• 924
• 930

1. 1

   Identify the Y015 valve on the rear hydraulic stack (Position 1, usually marked with a yellow decal or cap).

2. 2

   Inspect the electrical connector at the Y015 valve for moisture, corrosion, or backed-out pins.

3. 3

   Verify the CAN-BUS wiring harness integrity between the A002 ECU and the Y015 valve. A break in the CAN lines will cause the message missing fault.

4. 4

   Check the supply voltage to ensure the valve is receiving proper baseline power.

5. 5

   Connect the FENDIAS diagnostic tool to see if the valve is recognized on the valve bus. If recognized but the fault remains, the valve's internal electronics have failed.

1. 1

   Preparation

   Park the tractor on a level surface, lower all implements, turn off the engine, and actuate the hydraulic levers/terminal to relieve all residual hydraulic pressure. Disconnect the battery.

2. 2

   Removal

   Disconnect the electrical harness from the Y015 (yellow) spool valve.

3. 3

   Unbolt the Valve

   Remove the tie-rod bolts securing the valve stack. Carefully separate the Y015 valve from the hydraulic block. Note: Have a catch pan ready, as residual hydraulic oil will spill.

4. 4

   Installation

   Install the new auxiliary control valve, ensuring all O-rings between the valve slices are new and properly seated to prevent internal/external leaks.

5. 5

   Reassembly

   Torque the valve stack bolts to OEM specifications and reconnect the electrical harness.

6. 6

   Programming

   Connect the FENDIAS software and use the EOL (End of Line) program to configure the new valve to 'Position 1' so the A002 ECU recognizes it on the CAN bus.

7. 7

   Testing

   Reconnect the battery, start the tractor, clear the A.1.1F fault code, and test the hydraulic function.