Fendt 9.3.11 – Rear EPC (Electrohydraulic Power Control) module / E-box: Rear EPC, 'Raise' function — Fault in signal line to valve.

This code indicates an electrical circuit malfunction in the signal line communicating with the Y021 solenoid valve, which controls the 'Raise' function of the rear power lift. The system has detected an anomaly such as a short circuit to ground, a short circuit to battery voltage (+UB), or a break/open circuit in the wiring. As a safety measure, the electrohydraulic power lift control is locked, and the rear lift will not raise.

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

1. 1

   Locate the Y021 solenoid valve on the rear hydraulic control block and inspect the wiring harness and X332 connector for corrosion, pinched wires, or disconnected pins.

2. 2

   Use a multimeter to check the signal line for continuity from the E-box to the Y021 valve, and test for a short to ground or a short to power (+UB).

3. 3

   Test the Y021 solenoid coil resistance to check for an internal short or open circuit.

4. 4

   Attempt a mechanical override of the Y021 valve to verify if the hydraulic valve spool is physically seized or if the issue is strictly electrical.

5. 5

   Verify that the E-box is sending the correct voltage signal when the 'Raise' command is triggered.

1. 1

   Secure the Machine

   Relieve the rear lifting gear of any load (lower implements to the ground), switch off the engine, and engage the safety lock.

2. 2

   Access the Valve Block

   Remove the right rear wheel or protective metal guards as necessary to access the enhanced control hydraulics valve block where the Y021 solenoid is located.

3. 3

   Disconnect and Clean

   Disconnect the X332 connector at the Y021 solenoid. Clean the contacts with electrical contact cleaner. If the connector is damaged, splice in a new OEM pigtail connector.

4. 4

   Replace the Solenoid

   If the diagnostic tests proved the solenoid coil is dead, unscrew the faulty Y021 solenoid cartridge/coil from the valve block and install the replacement part.

5. 5

   Reassemble and Clear Codes

   Reconnect the wiring harness. Turn the tractor on and use the tractor's terminal or the FENDIAS diagnostic tool to clear the stored 9.3.11 fault code.

6. 6

   Test Operation

   Test the rear power lift using both the in-cab controls and the external pushbuttons to ensure the 'Raise' function operates smoothly without throwing the code again.