Fendt A.1.23 – Electrical Valves / VENDI: Y016 - Spool valve fault, valve 2 — Supply voltage > 18 volts

Overvoltage detection. The internal electronics of the auxiliary control valve (Valve 2, Y016) are measuring a power supply voltage exceeding 18 volts. As a built-in safety consequence, the system forces the valve to move into the neutral position and disables its operation to prevent uncontrolled hydraulic functions.

• 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
• 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

   System Voltage Check: Measure the tractor's overall system voltage at the battery and alternator while the engine is running. If the alternator voltage regulator has failed, it could be sending >18V to the entire system.

2. 2

   Wiring & Connector Inspection: Locate Valve 2 (Y016) at the rear hydraulic block. Disconnect its electrical connector (Connector X327). Inspect the pins for corrosion, moisture ingress, or damage.

3. 3

   Pin Voltage Test: With the tractor ignition on, use a multimeter to test the supply voltage pins on the tractor-side of connector X327. If the voltage reads a normal 12-14V, the wiring and ECU are fine, meaning the valve's internal circuit board has failed and is falsely reporting an overvoltage.

4. 4

   CAN Bus Check: Verify the CAN High and CAN Low lines between the enhanced control ECU and the valve to ensure there are no shorts to power.

1. 1

   Relieve hydraulic pressure

   Turn off the tractor, lower all implements to the ground, and relieve all hydraulic system pressure.

2. 2

   Disconnect electrical connector

   Disconnect the X327 electrical connector from the Y016 (Valve 2) spool valve.

3. 3

   Clean valve block area

   Clean the area around the hydraulic valve block thoroughly to prevent contamination.

4. 4

   Extract faulty valve section

   Unbolt the tie rods/mounting bolts securing the spool valve stack and carefully extract the faulty Y016 valve section.

5. 5

   Install replacement valve

   Install the replacement selective control valve section, ensuring new O-rings are used between the slices. Torque the mounting bolts to the manufacturer's specification (e.g., 30 Nm for Bosch SB1 type manifolds).

6. 6

   Reconnect lines and connector

   Reconnect the hydraulic lines and the X327 electrical connector.

7. 7

   Perform EOL programming

   Connect the FENDIAS / Serdia diagnostic tool. The new valve must be registered to the CAN bus via End-of-Line (EOL) programming and assigned to position 2.

8. 8

   Clear codes and test

   Clear the fault codes and test the hydraulic functions.