Fendt 9.3.22 – EPC C (Electronic Power Control): Front EPC rotary position sensor — Signal fault

The Electronic Power Control (EPC) system is detecting an invalid, missing, or out-of-range signal from the rotary position sensor that monitors the angle/height of the front power lift (hitch), triggering a 'Control locked' state.

• 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
• 309 Vario
• 310 Vario
• 311 Vario
• 312 Vario
• 413 Vario
• 414 Vario
• 415 Vario
• 815 Vario
• 816 Vario
• 817 Vario
• 818 Vario
• 820 Vario
• 822 Vario
• 824 Vario
• 826 Vario
• 828 Vario
• 918 Vario
• 922 Vario
• 927 Vario
• 933 Vario
• 936 Vario
• 939 Vario
• Farmer 400
• Favorit 500
• Favorit 700
• Favorit 900
• Xylon

1. 1

   Verify that the EPC module is delivering an 8.5V supply voltage to the sensor connector

2. 2

   Check the sensor output signal for a 4-20mA current loop (below 4mA indicates an open circuit, above 20mA indicates a short circuit)

3. 3

   Inspect the wiring harness from the front EPC rotary position sensor back to the EPC control unit for breaks, chafing, or severe corrosion at the connector pins

4. 4

   Ensure the mechanical arm/linkage connecting the front lift arm to the rotary sensor has not snapped, bent, or come loose

1. 1

   Access the Sensor

   Locate the front EPC rotary position sensor mounted on the front power lift assembly.

2. 2

   Disconnect & Remove

   Disconnect the electrical harness. Unbolt the sensor from its mounting bracket and detach the rotary linkage arm.

3. 3

   Install Replacement

   Mount the new sensor and reattach the mechanical linkage, ensuring it is positioned within its standard travel range.

4. 4

   Reconnect & Clear Codes

   Reconnect the 8.5V / 4-20mA electrical harness. Access the tractor's terminal/multiple display to clear the stored 9.3.22 fault code from the memory.

5. 5

   Calibration

   Perform an EOL (End of Line) programming or a lift calibration procedure via the terminal so the ECU can learn the new sensor's minimum and maximum travel limits.