Fendt 9.3.23 – EPC C (Electronic Power Control): Front EPC 'Depth control' setpoint setting — Signal line fault

The control unit is not receiving a valid signal from the rotary potentiometer used to set the depth control for the front power lift (Front EPC). As a consequence, the system will lock the front power lift controls for safety.

• 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
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario
• 916
• 920
• 924
• 926
• 930
• 936

1. 1

   Verify the supply voltage (typically 8.5V or 9.5V) from the A013 fuse board/ECU is present at the potentiometer connector.

2. 2

   Inspect the signal line wiring harness between the A004 control console (multifunction armrest) and the EPC C module for continuity, chafing, or pin corrosion.

3. 3

   Test the potentiometer using a multimeter to measure the resistance sweep of the depth control rotary dial. Look for dropouts, spikes to infinity, or dead spots.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent CAN-bus voltage spikes.

2. 2

   Access the Control Console

   Carefully disassemble the A004 control console / multifunction armrest to access the underside of the Front EPC rotary controls.

3. 3

   Replace the Potentiometer

   Disconnect the wiring harness from the faulty depth control potentiometer. Remove the retaining nut/clip holding the rotary dial in place and swap in the new potentiometer.

4. 4

   Reassemble

   Reconnect the wiring harness and reassemble the armrest console.

5. 5

   Perform Calibration

   Using the tractor's Varioterminal or FENDIAS diagnostic software, run Calibration Code 9001 (Front EPC - depth control). Follow the on-screen prompts to sweep the dial through its full range.

6. 6

   Clear Codes

   Clear the stored 9.3.23 fault code from the memory and test the front power lift for proper operation.