Fendt 1.2.C3 – EDC Control Module (A021) / Pump Control Unit (A020): CAN message failure or connection interruption between EDC and pump control unit

Indicates a CAN message failure or connection interruption between the EDC (Electronic Diesel Control) control module and the pump control unit (injection pump) when the engine starts. When this fault is active, the engine goes into a restricted idle mode, running at a fixed 720 RPM.

• 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
• 300 Vario
• 413 Vario
• 414 Vario
• 415 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• 820 Vario

1. 1

   Verify Symptoms: Confirm that the engine is restricted to idle (720 RPM) upon startup.

2. 2

   Analyze Codes First: Check for other active codes that might indicate a broader CAN bus failure before replacing any pump or control module.

3. 3

   Wiring and Connection Inspection: Check the CAN bus wiring for a break in the wiring or a short circuit between the EDC Control Module (A021) and the Injection Pump Control Unit (A020).

4. 4

   Consult Diagrams: Refer to the Fendt workshop manual 'Chapter 2000 Reg.B (EDC-Failure)' and the electrical circuit diagram specifically labeled 'EDC Control' to trace the CAN lines.

1. 1

   Inspect harness

   Physically inspect the wiring harness and connectors linking the EDC control module to the injection pump. Look for chafed wires, corrosion, or loose pins.

2. 2

   Repair wiring

   If a wiring discontinuity or short circuit is found on the CAN bus lines, repair or replace the affected section of the harness.

3. 3

   Clear codes

   Use the Fendt SERDIA diagnostic software to delete the error code (FC:00C1) and retest the system.

4. 4

   Replace component

   If the wiring is fully intact and the CAN message failure persists, the fault lies within either the EDC Control Module (A021) or the Injection Pump Control Unit (A020). Replace the faulty module according to the manual's test procedures.

5. 5

   Reprogram module

   If the EDC control module is replaced, EOL (End of Line) programming may be required to match the engine control unit to the tractor model.