Fendt 9.1.52 – A002 - ECU, enhanced control: Spool valve fault: Supply voltage < 8 V

The system has detected that the supply voltage to the Y019 auxiliary control valve has dropped below 8 volts. As a safety measure, the valve automatically moves into the neutral position, and the front power lift 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 Farmer 400 series
• Fendt Favorit 700 series
• Fendt Favorit 900 series
• Fendt Vario 300 series
• Fendt Vario 400 series
• Fendt Vario 700 series
• Fendt Vario 800 series
• Fendt Vario 900 series

1. 1

   Check fuses F040, F041, and F047 on the A013 circuit board, which supply power to the CAN bus and electric auxiliary control valves.

2. 2

   Disconnect the harness at the Y019 valve and measure the supply voltage (must be between 8V and 18V). If below 8V, the issue is electrical.

3. 3

   Inspect wiring and connectors X330, X640 (+UB power supply), X641 (CAN high), and X642 (CAN low) for corrosion, moisture, or backed-out pins.

4. 4

   Check hydraulic control pressure to ensure it is above 22 bar, as pressure drops can trigger secondary valve faults.

1. 1

   Locate the Y019 Valve

   The valve is located on the right side of the tractor, at the right entry step, behind the hydraulic oil tank.

2. 2

   Access the Valve Block

   Remove the footplate and the protective metal panel to expose the central control block (ZSB).

3. 3

   Relieve Hydraulic Pressure

   Ensure the tractor is off, the implement is lowered, and all hydraulic pressure is relieved from the system.

4. 4

   Disconnect Electrical Harness

   Unplug the electrical connectors (X640, X641, X642) from the Y019 valve.

5. 5

   Remove the Valve

   Unbolt the Y019 auxiliary control valve from the Bosch SB 23 valve stack. Be prepared to catch residual hydraulic oil.

6. 6

   Install the New Valve

   Mount the replacement valve using new O-rings/seals. Torque the mounting bolts to 30 Nm (standard for the Bosch SB 23 series).

7. 7

   Reassemble and Test

   Reconnect the electrical harness, reinstall the metal panel and footplate, start the tractor, and test the front power lift for proper operation and leakages. Clear the fault code via the terminal.