Fendt 1E.1.C3 – A051 - ECU, engine control unit (EDC 7): CAN bus B, cable break or short circuit.

The tractor will likely enter a restricted operating mode, but driving with the foot throttle/throttle pedal is still possible.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 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
• 919 Vario COM III

1. 1

   Check the CAN bus B wiring harness connected to the A051 Engine Control Unit (EDC 7) for any visible cable breaks, chafing, or short circuits.

2. 2

   Consult the specific 'EDC engine control' circuit diagram for your model (often listed as Sheet 21 or Sheet 36 in Fendt manuals) to trace the CAN bus B lines.

3. 3

   Connect the Fendt SERDIA diagnostic software (or equivalent AGCO diagnostic tool) to read the active states (look for internal failure code FC:00C1).

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent electrical spikes during repair.

2. 2

   Access the ECU

   Locate the A051 Engine Control Unit (EDC 7).

3. 3

   Repair Wiring

   If a break or short is found in the CAN bus B wiring during the diagnostic phase, repair the damaged section of the harness or replace the specific cable segment.

4. 4

   Check ECU Pins

   Inspect the connector pins on the EDC 7 unit and the wiring harness plug for corrosion, bent pins, or moisture intrusion. Clean or repair as necessary.

5. 5

   Clear Fault Codes

   Reconnect the battery and turn the ignition on. Use the SERDIA diagnostic software to delete the error code from the A051 memory. (Note: Canceling the fault code on the tractor's instrument cluster display only hides it; it must be cleared from the ECU memory using the software).

6. 6

   Test Drive

   Start the engine and verify that full throttle control is restored and the tractor no longer defaults to the restricted foot-throttle-only mode.