Fendt 4.1.E6 – A002 - ECU, enhanced control: Checksum error for load limit control parameters

A checksum error means that the software parameters stored in the ECU for the load limit control function are corrupted, invalid, or missing. The load limit control determines how far the engine speed is allowed to drop under load before the transmission automatically readjusts.

• 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
• 200 Vario (V / F / P)
• 300 Vario (COM III)
• 400 Vario (COM III)
• 700 Vario (COM III)
• 800 Vario (COM III)
• 900 Vario (COM III)

1. 1

   Check the tractor's multifunction display for other active fault codes related to the A002 ECU or CAN bus communication, which could indicate a broader module failure or wiring issue.

2. 2

   Verify if the tractor has defaulted to emergency mode or if TMS (Tractor Management System) functions are restricted.

3. 3

   Check software version to ensure the correct parameters are loaded for the specific tractor model, as mismatched parameters will trigger checksum errors.

1. 1

   Connect diagnostic software

   Connect the Fendt Fendias diagnostic software using the AGCO 2x4 CANUSB Diagnostic Tool to the tractor's G and K bus ports.

2. 2

   Run EOL programming software

   Run the EOL programming software (e.g., EOL 7.76 or later).

3. 3

   Build connection

   Select 'Programming Development' and input the tractor's chassis number to build the connection.

4. 4

   Reprogram parameters

   Reload/reprogram the load limit control parameters for the A002 ECU.

5. 5

   Wait for programming

   Wait for the programming to finish (this can take 15-20 minutes).

6. 6

   Perform hard reset

   Once the devices have been switched into bootloader mode for programming, perform a hard reset of the devices: Turn the Ignition OFF, wait 15 seconds, and turn the Ignition ON.

7. 7

   Clear fault codes

   Clear the stored fault codes from the memory.

8. 8

   Test drive

   Test drive the tractor under load to verify the load limit control functions correctly.

9. 9

   Replace ECU

   If EOL programming fails, the stored values remain illogical, or the checksum error immediately returns, the A002 ECU (E-box) itself has suffered a hardware memory failure and must be replaced.