Fendt 5.1.8F – A002 - ECU, enhanced control: Checksum error old automatic mode sequence data

The control module has detected a memory or data corruption issue (checksum mismatch) within the saved parameters for the tractor's automatic functions (such as the Tractor Management System or sequential automated tasks). The tractor will experience 'Limited enhanced control operation' or 'Reduced comfort.' The tractor can still be driven, but automated sequence functions and enhanced comfort features will be restricted or disabled.

• 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 Series
• 309 COM III
• 310 COM III
• 311 COM III
• 312 COM III
• Fendt 400 Vario Series
• 409 COM III
• 410 COM III
• 411 COM III
• 412 COM III
• Fendt 700 Vario Series
• 711 COM III
• 712 COM III
• 714 COM III
• 716 COM III
• 717 COM III
• 718 COM III
• Fendt 800 Vario Series
• 815 COM III
• 817 COM III
• 818 COM III
• Fendt 900 Vario Series
• 916 COM III
• 920 COM III
• 924 COM III
• 926 COM III
• 930 COM III

1. 1

   Verify Power Supply: Check the voltage supply to the CAN-Bus and the A002 ECU. Inspect the A013 printed circuit fuse board (specifically check fuses F040 and F041).

2. 2

   Inspect Wiring: Check the wiring harness and separation points (e.g., X031 separation point on the ECU) for the A002 module located on the right mudguard. Ensure there is no corrosion or loose pins causing data transfer interruptions.

3. 3

   Clear and Retest: Connect the FENDIAS diagnostic tool and attempt to clear the fault code to see if it is a hard fault or a transient memory glitch.

1. 1

   Connect Diagnostic Tool

   Connect the FENDIAS (or SERDIA for engine-related cross-checks) diagnostic laptop to the tractor's diagnostic port.

2. 2

   Perform EOL Programming

   Run new EOL (End-Of-Line) programming. This will rewrite the corrupted automatic mode sequence data and correct the checksum error.

3. 3

   EPROM / Flash Check

   On newer Vario models, EOL programming should resolve the issue directly. On older models, if the EOL programming fails to take, the EPROM chip or the entire A002 ECU must be replaced.

4. 4

   Test Operation

   After successful EOL programming, cycle the ignition, clear any residual codes, and test the tractor's automatic functions (TMS, joystick automatic buttons) to verify that full comfort operation has been restored.