Fendt 4.1.20 – A002 - ECU, enhanced control: Accelerator pedal release potentiometer not calibrated or EEPROM checksum error

The accelerator pedal release potentiometer (slide switch) is either not calibrated or there is an EEPROM checksum error, preventing the tractor from being driven in accelerator pedal mode.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 300 Vario (including COM III)
• Fendt 400 Vario / Farmer 400 (including COM III)
• Fendt 700 Vario / Favorit 700 (including COM III)
• Fendt 800 Vario (including COM III)
• Fendt 900 Vario / Favorit 900 (including COM III)

1. 1

   Check Calibration Status: Access the tractor's diagnostic menu to see if the joystick's slide switch has lost its calibration values.

2. 2

   Check CAN Bus Communication: Verify that there are no underlying CAN bus communication faults between the A034 Joystick and the A002 ECU (look for accompanying codes like 0.0.1F or A.1.CC).

3. 3

   Verify EEPROM Status: If the calibration is correct but the code persists, check if the A002 ECU has an EEPROM checksum error indicating data corruption.

1. 1

   Recalibrate the Slide Switch

   Enter the tractor's diagnostic/calibration menu and run Calibration Code 4010 to recalibrate the accelerator pedal release pot ('slide switch').

2. 2

   End-of-Line (EOL) Programming

   If calibration fails or the system reports an EEPROM checksum error, the A002 ECU requires new End-of-Line (EOL) programming using FENDIAS to reload the correct data record.

3. 3

   Hardware Replacement

   If EOL programming and calibration code 4010 do not clear the fault, replace the physical potentiometer inside the joystick (A034) or the accelerator pedal position sensor.