Fendt 1.1.04 – A002 - ECU, enhanced control: A002 - ECU, enhanced control — Tractor Management System (TMS) checksum error.

The system has detected a checksum error in the Tractor Management System (TMS) software parameters, meaning data stored in the module's memory has become corrupted or does not match the expected mathematical value. The TMS will cease to function and the tractor will typically default to a restricted operating mode where it can only be driven using the foot throttle accelerator.

• 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
• 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 (COM III)
• Fendt 400 Vario (COM III) / Farmer 400
• Fendt 700 Vario (COM III) / Favorit 700
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III) / Favorit 900 (e.g., 916, 920, 924, 926, 930)

1. 1

   Verify the battery voltage and ensure the power supply and ground connections to the A002 ECU are clean and secure to rule out voltage drops.

2. 2

   Scan for accompanying CAN bus or EDC/EMR communication faults (such as 0.0.11 or 1.1.05) which might indicate a broader wiring or communication issue.

3. 3

   Disconnect the battery for 10-15 minutes to perform a hard reset of the modules to see if the checksum error clears upon reboot.

1. 1

   Connect diagnostic tool

   Connect the FENDIAS (Fendt Diagnostic System) laptop to the tractor's diagnostic port.

2. 2

   Perform EOL programming

   Perform EOL (End-of-Line) programming to reflash the A002 ECU with the correct factory software data record for that specific tractor chassis.

3. 3

   Verify operation

   After the EOL programming is complete, cycle the key and clear the fault codes. Test drive the tractor to ensure the TMS engages properly and the 1.1.04 code does not return.

4. 4

   Replace ECU

   If the FENDIAS tool cannot communicate with the A002 ECU, or if the EOL programming fails to resolve the checksum error, replace the A002 ECU and perform EOL programming on the new unit.