Fendt 1.2.A6 – EDC Control Module (A021) / Pump Control Unit (A020): Engine stop, fault in signal processing in EDC control module

A critical signal processing or communication failure involving the Electronic Diesel Control (EDC) system and the injection pump. This forces the tractor into a derated state, resulting in reduced engine speed, restricted power, or a complete engine stop to protect the powertrain.

• 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
• Farmer 409 Vario
• Farmer 410 Vario
• Farmer 411 Vario
• Farmer 412 Vario
• Farmer 413 Vario
• Farmer 414 Vario
• Farmer 415 Vario
• Favorit 711 Vario
• Favorit 712 Vario
• Favorit 714 Vario
• Favorit 716 Vario
• Favorit 718 Vario
• Favorit 916 Vario
• Favorit 920 Vario
• Favorit 924 Vario
• Favorit 926 Vario
• Favorit 930 Vario

1. 1

   Connect the FENDIAS diagnostic tool. Record the failure and ambient parameters, delete the failure memory, and re-test to see if the code actively returns.

2. 2

   Thoroughly check the wiring harness and connectors between the EDC Control Module (A021) and the Pump Control Unit (A020). Look for corrosion, backed-out pins, or chafed wires.

3. 3

   Check the power supply (+UB) to the EDC Control Module. Verify that the fuses supplying A021 are intact and providing proper voltage.

4. 4

   Check the CAN-Bus connection between the EST enhanced control module (A002) and the EDC control module (A021).

5. 5

   Utilize the "EDC Control" electrical circuit diagram in the Fendt service manual to trace the specific pinouts for your exact chassis number.

1. 1

   Disconnect Power

   Always disconnect the battery before servicing the EDC system or unplugging ECU connectors.

2. 2

   Repair Wiring

   If the diagnostic checks reveal high resistance, shorts, or broken wires between A021 and A020, repair the wiring harness or replace the damaged connector terminals.

3. 3

   Module Replacement

   If the wiring, fuses, and CAN-Bus connections are all verified as good but the signal processing fault persists, the EDC Control Module (A021) has failed internally and must be replaced.

4. 4

   Installation

   Mount the new EDC Control Module and securely reconnect the X047/X048 connectors.

5. 5

   EOL Reprogramming

   A new EDC Control Module will trigger an EOL (End of Line) programming error (such as code 1.1.A0) until it is calibrated. You must use FENDIAS or Serdia diagnostic software to perform EOL reprogramming, ensuring the correct tractor type and engine parameters are flashed to the new module.

6. 6

   Final Testing

   Clear all stored fault codes and test run the tractor under load to ensure full power is restored and the engine does not stall.