Fendt B.1.24 – A002 - ECU, enhanced control: CAN Bus communication fault between A034 - Drive switch and Teach-in (program run)

Data transfer error or interruption on the Enhanced Control CAN Bus between the main joystick/drive switch and the Variotronic TI (Teach-in) system, causing the Teach-in function to not operate.

• 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) 411
• Fendt 400 Vario (COM III) 412
• Fendt 400 Vario (COM III) 413
• Fendt 400 Vario (COM III) 414
• Fendt 400 Vario (COM III) 415
• Fendt 700 Vario (COM III) 712
• Fendt 700 Vario (COM III) 714
• Fendt 700 Vario (COM III) 716
• Fendt 700 Vario (COM III) 718
• Fendt 800 Vario (COM III) 818
• Fendt 800 Vario (COM III) 820
• Fendt 900 Vario (COM III) 916
• Fendt 900 Vario (COM III) 920
• Fendt 900 Vario (COM III) 924
• Fendt 900 Vario (COM III) 926
• Fendt 900 Vario (COM III) 930

1. 1

   Check the CAN Bus power supply voltage and fuse F047 on printed circuit board A013

2. 2

   Inspect the wiring harness and connectors between the A002 ECU and the A034 Drive switch for continuity, shorts to ground, or loose pins

3. 3

   Use the FENDIAS diagnostic program to check the A034 drive switch, read the error counter, and determine if the module has lost its programming (EOL checksum error)

1. 1

   Verify the Fault

   Confirm the presence of fault code B.1.24 on the tractor's terminal. Note that the Teach-in function will be disabled.

2. 2

   Check Fuses

   Locate the A013 fuse board and test fuse F047. Replace the fuse if it is blown.

3. 3

   Inspect Connections

   Disconnect the battery. Inspect the harness connectors at the A034 Drive switch (Joystick) and the A002 ECU. Clean any corrosion and ensure pins are seated tightly.

4. 4

   Test CAN Lines

   Measure the resistance and continuity of the CAN bus lines between the A002 ECU and the A034 Drive switch to rule out a broken wire or short circuit.

5. 5

   Reprogramming

   If the wiring and power supply are intact, the A034 Drive switch or A002 ECU may require new EOL (End of Line) programming via the FENDIAS dealer tool.

6. 6

   Component Replacement

   If EOL programming fails or the hardware is internally shorted, replace the A034 Drive switch or the A002 ECU.

7. 7

   Clear Codes

   Restart the tractor, clear the fault codes from the memory, and test the Variotronic TI (Teach-in) system to ensure normal operation.