Fendt 1.2.89 – EDC Control Module (A021) / Pump Control Module (A020): A020 - Pump control unit (injection pump) — Electronic volume controller fault

The EDC system has failed its auto-diagnostic check because the pump characteristic is not found. This indicates an internal electronic or mechanical failure of the volume controller within the Bosch VP44 injection pump, which will prevent the engine from starting.

• 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
• Favorit 711 Vario
• Favorit 712 Vario
• Favorit 714 Vario
• Favorit 715 Vario
• Favorit 716 Vario
• Favorit 717 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• Favorit 916 Vario
• Favorit 920 Vario
• Favorit 924 Vario
• Favorit 926 Vario
• Favorit 930 Vario

1. 1

   Wiring & Communication: Check the EDC control circuit diagram (Chapter 2000 Reg.B). Verify the power supply (+UB) and the CAN-bus communication lines between the EDC Control Module (A021) and the Pump Control Unit (A020).

2. 2

   Fuel System Integrity: Check the primary fuel filter and the lift pump (supply pump). VP44 injection pumps are highly sensitive to dirty fuel and fuel starvation.

1. 1

   Access fuel injection pump

   Disconnect the battery and remove necessary engine covers to access the fuel injection pump.

2. 2

   Disconnect wiring harnesses

   Disconnect the CAN-bus and power wiring harnesses from the A020 Pump Control Unit.

3. 3

   Remove and cap fuel lines

   Remove the high-pressure fuel lines and cap them to prevent contamination.

4. 4

   Remove injection pump

   Remove the faulty Bosch VP44 injection pump.

5. 5

   Drain fuel system and replace filter

   Drain the fuel system and replace the primary fuel filter. It is also highly recommended to test or replace the lift pump, as a failing lift pump will quickly destroy the replacement VP44 pump.

6. 6

   Install replacement injection pump

   Install the replacement VP44 injection pump, ensuring proper engine timing alignment according to the Fendt/MAN workshop manual.

7. 7

   Reconnect lines and connectors

   Reconnect all fuel lines and electrical connectors.

8. 8

   Bleed fuel system

   Bleed the fuel system thoroughly before attempting to start the engine.

9. 9

   Clear fault codes

   Clear the EDC fault codes using a diagnostic tool.