Fendt 1.2.B1 – Engine Control Module (EDC): EDC CAN message fault

CAN communication failure or timeout between the Engine Control Module (EDC) and the Pump Control Unit (Injection Pump). The system detects that the CAN signal from the EDC Control Module to the Pump Control Module has failed. This condition typically results in restricted or reduced engine power, with maximum speed often reduced to 2000 RPM and torque reduced by 25-40%.

• 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
• Fendt Farmer 409
• Fendt Farmer 410
• Fendt Farmer 411
• Fendt Farmer 412
• Fendt Favorit 711
• Fendt Favorit 712
• Fendt Favorit 714
• Fendt Favorit 716
• Fendt Favorit 916
• Fendt Favorit 920
• Fendt Favorit 924
• Fendt Favorit 926
• Fendt Favorit 930
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)

1. 1

   Check for wiring discontinuities, broken wires, or short circuits in the CAN bus harness between the EDC Control Module (A021) and the Pump Control Module (A020). Refer to the 'EDC control' circuit diagram for pinout specifics.

2. 2

   Connect the FENDIAS diagnostic tool to record failure and ambient parameters.

3. 3

   Delete the failure code memory using FENDIAS and cycle the system to see if the fault code returns. Fendt documentation explicitly states that before replacing any pump or control module, failure codes must be analyzed, deleted, and re-checked.

4. 4

   Check for accompanying codes that might indicate a power supply issue to the pump (e.g., 1.2.B3) or an internal pump failure (e.g., 1.2.B2). Address codes that do not require module replacement first.

1. 1

   Disconnect battery power

   Disconnect battery power before servicing the EDC or injection pump wiring.

2. 2

   Repair or replace wiring

   Repair or replace any damaged sections of the CAN bus wiring harness or connectors between the A021 EDC module and the A020 Pump Control Unit.

3. 3

   Clear fault codes

   Reconnect battery power and use FENDIAS to clear the fault codes.

4. 4

   Verify communication

   Run the tractor to verify if the CAN communication is restored.

5. 5

   Identify faulty module

   If the wiring is fully intact and the fault persists, the failure lies within either the EDC Control Module (A021) or the Injection Pump Control Module (A020).

6. 6

   Replace faulty module

   Replace the faulty module (Injection Pump or EDC) based on secondary diagnostic tests. Note: On many of these systems, the pump control module is an integrated part of the injection pump and cannot be replaced separately; the entire injection pump must be replaced.

7. 7

   Perform EOL programming

   Perform any necessary EOL (End of Line) programming or calibration for the new module using FENDIAS.