Fendt 9.3.26 – EPC C (EPC e-box A005): External position sensor for front power lift — Signal line fault

The signal from the external position sensor for the front power lift is disrupted, out of position, or the sensor itself has failed, causing the system to terminate and lock the control of the front power lift to prevent unintended movement.

• 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
• Fendt 300 Vario (COM III)
• Fendt Farmer 400 Vario (COM III)
• Fendt Favorit 500 series
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III, S4 series, e.g., 916, 920, 924, 926, 927, 930, 933, 936, 939)

1. 1

   Visually inspect the physical mounting of the external position sensor on the front power lift to ensure it has not been knocked out of position or mechanically damaged.

2. 2

   Inspect the wiring harness between the external position sensor and the EPC e-box (A005) for broken wires, chafing, or short circuits.

3. 3

   Disconnect the sensor and check the pins for corrosion, moisture ingress, or loose connections.

4. 4

   Test the sensor's output signal voltage (the system expects a stable voltage; drops below 1V or spikes indicate internal sensor failure).

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to de-energize the EPC system.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a broken wire or corroded connector on the signal line, repair the harness or replace the connector plug.

3. 3

   Replace Sensor

   If the wiring is intact but the sensor is faulty or mechanically broken, unbolt the defective external position sensor from the front power lift linkage.

4. 4

   Install New Sensor

   Mount the new position sensor, ensuring the mechanical linkage/angle aligns correctly with the lift arms so it reads the true position.

5. 5

   Reconnect

   Plug the wiring harness back into the sensor.

6. 6

   Clear Codes

   Reconnect the battery, turn on the ignition, and use the tractor's terminal or a diagnostic tool to clear the stored 9.3.26 fault code from the EPC C memory.

7. 7

   Test Operation

   Test the front power lift using the cab controls and external buttons to confirm the lift raises and lowers smoothly and the control lock has been lifted.