Fendt 9.1.57 – Enhanced Control ECU (A002): Y019 - Spool valve fault — Internal position sensor fault

The internal position sensor (often a Hall effect sensor) inside the Y019 auxiliary control valve has failed or is sending an implausible signal. Because the system can no longer verify the spool's position, the safety protocol is triggered, and the valve automatically moves into the neutral position, resulting in a complete loss of function for the hydraulic circuit controlled by that valve.

• 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
• 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 series
• Favorit 700 Vario series
• Favorit 900 Vario series
• 300 Vario series
• 400 Vario series
• 500 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series

1. 1

   Inspect the electrical connector at the Y019 valve for corrosion, moisture, or broken wires on the CAN II bus lines (Pins 4 and 5)

2. 2

   Ensure the valve is receiving proper supply voltage (between 8V and 18V)

3. 3

   Verify that the hydraulic control pressure has not dropped below 22 bar

4. 4

   Inspect for heavily contaminated oil, which can cause the main piston to jam and stress valve components

5. 5

   Read out the KWP code using the FENDIAS or SERDIA diagnostic software to confirm the exact nature of the sensor failure

1. 1

   Depressurize the System

   Lower the front power lift (and any other implements) to the ground. Turn off the tractor and relieve all hydraulic system pressure.

2. 2

   Locate the Valve

   The Y019 valve is located on the central control block (ZSB). On many Fendt models, this is accessed on the right side of the tractor, near the right entrance step, behind the hydraulic oil tank or access flap.

3. 3

   Disconnect Electricals

   Unplug the M12 5-pin electrical connector from the Y019 spool valve.

4. 4

   Remove the Valve

   Mark the hydraulic lines for reassembly, then disconnect them. Cap the lines immediately to prevent dirt ingress. Unbolt the Y019 valve from the manifold block.

5. 5

   Install the New Valve

   Mount the replacement spool valve, ensuring all O-rings are perfectly seated. Torque the mounting bolts evenly in a crisscross pattern to prevent distorting the valve body, which can cause sluggish spool response.

6. 6

   Reassemble

   Reconnect the hydraulic lines and the electrical connector.

7. 7

   Calibration

   Connect the FENDIAS diagnostic tool. Clear the old fault codes and perform an End-of-Line (EOL) programming / Teach-in procedure so the Enhanced Control ECU recognizes the new valve's parameters.