Fendt 1.1.9F – A002 ECU: A034 - Drive switch (memory buttons) faulty / CAN connection (enhanced control BUS) faulty.

Indicates a line discontinuity or CAN bus communication failure between the A002 ECU and the A034 Drive Switch (the main control joystick on the side console). The tractor enters a restricted operating mode (Chapter 2000 Reg.B - EDC/EMR fault), causing the operator to lose enhanced driving features and hand throttle capabilities, meaning the tractor can only be driven using the foot throttle.

• 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 Farmer 400 Vario
• Fendt Favorit 700 and 900 Vario
• Fendt 300, 400, 700, 800, and 900 Vario series (including COM III generation models)

1. 1

   Check the CAN Bus power supply by inspecting fuse F047 on the A013 printed circuit board

2. 2

   Inspect the wiring harness and connectors for line discontinuity, corrosion, or loose pins between the A002 ECU and the A034 Drive Switch

3. 3

   Run FENDIAS Diagnostics to verify if the A002 ECU can communicate with the A034 joystick and check for secondary Transmission or Comfort-BUS faults

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the battery to prevent electrical shorts.

2. 2

   Fuse Inspection

   Locate the A013 circuit board. Inspect fuse F047. If blown, replace it and test the tractor. If it blows again, there is a short in the joystick wiring.

3. 3

   Harness Repair

   Access the side console and inspect the physical connector at the base of the A034 Drive Switch. Clean the contacts with electrical contact cleaner. Repair any chafed or broken wires leading back to the A002 ECU.

4. 4

   Component Replacement

   If the wiring and fuses are intact but communication cannot be established, the A034 Drive Switch (Joystick) has suffered an internal failure and must be replaced.

5. 5

   EOL Programming

   If you replace the A034 joystick, you must use the FENDIAS diagnostic program to perform an EOL (End of Line) programming/teach-in so the A002 ECU recognizes the new joystick.

6. 6

   Test

   Clear the fault codes, start the tractor, and verify that the hand throttle and enhanced transmission functions have been restored.