Fendt 1E.1.C4 – A051 - ECU, engine control unit (EDC 7): A051 - ECU, engine control unit (EDC 7). CAN bus C, break in wiring or short circuit.

Communication failure on the tractor's CAN bus C network, specifically a physical cable break or a short circuit preventing the engine control unit from communicating properly with the rest of the tractor's enhanced control systems.

• 309 Vario COM III
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• 922 Vario COM III
• 924 Vario COM III
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1. 1

   Visually and electrically inspect the wiring harness for CAN bus C for any cable breaks or short circuits.

2. 2

   Check the main multi-pin connectors at the A051 Engine Control Unit (EDC 7) and the A002 Enhanced Control Unit for corrosion, backed-out pins, or moisture.

3. 3

   Consult the Fendt OEM circuit diagram specifically for 'EDC engine control' (often listed as Sheet 21, 28, or 33 depending on the model) to trace the CAN bus C lines.

4. 4

   Connect the FENDIAS (SERDIA) diagnostic software to read the internal sub-code, which should display as FC:00C2.

1. 1

   Isolate the Battery

   Disconnect the tractor's battery before unplugging the EDC 7 module to prevent voltage spikes.

2. 2

   Repair the Harness

   If a broken wire, chafed insulation, or short to ground/power is found on the CAN bus C lines between the A051 and A002 modules, repair the wiring using OEM-approved splicing methods or replace the affected harness section.

3. 3

   Module Testing/Replacement

   If the wiring tests perfectly (proper continuity and no shorts), the CAN transceiver inside the A051 EDC 7 unit itself may have failed. The unit will need to be sent out for mechatronic repair or replaced.

4. 4

   Clear Faults

   Reconnect the battery and use the SERDIA / FENDIAS diagnostic tool to execute a 'delete error' command for FC:00C2.

5. 5

   Test Drive

   Verify that the tractor regains full Tractor Management System (TMS) functionality and is no longer restricted to manual foot-throttle-only operation.