Fendt 1.2.BC – Engine Control Unit (EDC 7) / A051: CAN-message missing

CAN bus communication between the enhanced control module (A002) and the engine control unit (A051) has been interrupted or is faulty.

• 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 (309, 310, 311, 312)
• Fendt 400 Vario COM III
• Fendt 700 Vario COM III
• Fendt 800 Vario COM III
• Fendt 900 Vario COM III (922, 924, 927, 930, 933, 936)

1. 1

   Check the physical CAN bus connection between the A002 (enhanced control ECU) and the A051 (engine control unit) using the enhanced control bus circuit diagrams.

2. 2

   Inspect the main separation points and connectors on the A051 ECU (e.g., connectors X1466, X1671, X1672) for corrosion, backed-out pins, or moisture.

3. 3

   Verify that the ECU has not lost its configuration, as a wrong EOL programming state can trigger communication dropouts.

1. 1

   Repair CAN Wiring

   If a break, short, or high resistance is found in the CAN wiring between the A002 and A051 modules, repair the harness or replace the damaged connector pins.

2. 2

   Repair or Replace ECU

   If the wiring is intact but the A051 module is unresponsive, the Bosch EDC 7 unit itself may have an internal hardware failure requiring repair by a mechatronics specialist or full replacement.

3. 3

   Perform EOL Programming

   If the A051 Engine Control Unit is replaced or if the data record was corrupted, you must perform EOL (End of Line) programming to write the correct engine parameters and configuration back to the module.

4. 4

   Clear Fault Codes

   Once the physical repair and programming are complete, connect the Fendt SERDIA diagnostic software to delete the error code (Internal FC: 007C) from the system.