Fendt 9.1.B2 – A004: Depth control setpoint potentiometer is not calibrated

The system cannot read the calibrated limits of the rotary control knob. As a result, setpoint values cannot be set for the Front Power Lift (Front EPC), meaning the operator will lose position/depth control functionality.

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1. 1

   Verify the fault code is exactly 9.1.B2 (Not calibrated) and not 9.1.B3 (which indicates a signal fault or hardware failure).

2. 2

   Ensure the A004 Control Console is communicating on the CAN-Bus.

3. 3

   Verify the voltage supply for the CAN-Bus on printed circuit board A013, specifically checking fuses F040 and F041.

4. 4

   Inspect the physical rotary knob for the depth control on the console to ensure it rotates smoothly and is not physically broken or obstructed.

1. 1

   Access diagnostic menu

   Turn on the tractor ignition and access the tractor's diagnostic/calibration menu via the terminal.

2. 2

   Navigate to calibration

   Navigate to the calibration section for the Front Power Lift (Front EPC).

3. 3

   Enter calibration code

   Enter calibration code 9001.

4. 4

   Sweep potentiometer

   Follow the on-screen prompts to sweep the depth control setpoint rotary potentiometer through its full range of motion so the A004 ECU can learn its minimum and maximum values.

5. 5

   Save and test

   Save the calibration and cycle the key. Test the Front Power Lift to ensure setpoint values can now be adjusted. (Note: If the calibration fails to save or the values jump erratically during the procedure, the potentiometer itself has failed and must be replaced).