Fendt 1.2.A9 – EDC (Electronic Diesel Control) Control Module (A021): Pump control unit (injection pump) (EDC) — Fault identified during self-diagnostic test.

The system has detected an internal failure (RAM fault or auto-diagnostic failure) within the injection pump's integrated control unit during its self-test, causing the engine to experience reduced power, stall, or fail to start.

• 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
• Favorit 916 Vario
• Favorit 920 Vario
• Favorit 924 Vario
• Favorit 926 Vario
• Favorit 930 Vario
• Favorit 711 Vario
• Favorit 712 Vario
• Favorit 714 Vario
• Favorit 716 Vario
• Farmer 409 Vario
• Farmer 410 Vario
• Farmer 411 Vario
• Farmer 412 Vario
• 815 Vario
• 817 Vario
• 818 Vario

1. 1

   Verify power supply and voltage monitoring within the EDC control module to rule out voltage drops triggering false internal pump faults

2. 2

   Inspect the wiring harness and connectors between the EDC Control Module (A021) and the Pump Control Unit (A020) for breaks or corrosion, focusing on the EDC Control circuit

3. 3

   Verify fuel supply, primary pressure, and interior pressure of the pump

4. 4

   Check fuel temperature to ensure the system is not overheating, which can cause the pump control unit to malfunction

1. 1

   Preparation

   Relieve all hydraulic and fuel system pressure. Disconnect the battery.

2. 2

   Clear Access

   Drain necessary fluids. Remove obstructing components to access the left side of the engine where the A020 VP44 pump is located (this often requires removing the fuel tank, battery box, and surrounding brackets/hoses).

3. 3

   Removal

   Disconnect the electrical harness to the A020 control unit. Loosen the mounting bolts and high-pressure fuel lines, then carefully detach the injection pump from the engine.

4. 4

   Installation

   Install the new or remanufactured VP44 pump. Reattach all high-pressure lines and the electrical harness.

5. 5

   Reassembly

   Reinstall the fuel tank, battery, and brackets. Refill all drained fluids.

6. 6

   Calibration

   The new pump may require EOL (End of Line) programming or calibration via the FENDIAS diagnostic tool to sync with the A021 EDC control module.