Fendt 1.2.B6 – A021 EDC: A020 - Pump control unit (injection pump) (EDC) — Fault during self-diagnostic test (EEPROM status)

The internal memory (EEPROM) of the electronic injection pump control unit has failed its automated self-diagnostic check. When this fault is active, the system defaults to a restricted operating mode, resulting in reduced engine speed and reduced engine power 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
• Favorit 900 Series
• 918 Vario
• Vario 300 series
• Vario 400 series
• Vario 700 series
• Vario 800 series

1. 1

   Check the power supply (+UB30) and ground connections to the A020 Pump Control Unit and the A021 EDC control module, as low voltage can trigger an EEPROM read error.

2. 2

   Test relays K020 and K021, which supply voltage to the Pump Control Unit, to ensure they are not failing and interrupting power.

3. 3

   Inspect the 'EDC Control' circuit wiring harness for breaks, corrosion, or short circuits between the EDC module and the injection pump.

4. 4

   Attempt a software reset using FENDIAS or SERDIA diagnostic software to clear the code. If it returns immediately, it indicates a hard internal failure of the pump module.

1. 1

   Disconnect battery

   Disconnect the tractor's battery to prevent electrical spikes before beginning any repair work.

2. 2

   Access injection pump

   Remove the intake piping, fuel lines, and necessary engine covers to access the injection pump assembly.

3. 3

   Lock engine timing

   Lock the engine at top dead center (TDC) and lock the injection pump gear to maintain timing before removal.

4. 4

   Remove injection pump

   Remove the entire injection pump assembly, as the A020 control unit is physically integrated into the top of the pump.

5. 5

   Replace or rebuild pump

   Replace the pump with a new or remanufactured unit, or send it to an authorized diesel injection specialist who can rebuild the pump and replace the A020 control module.

6. 6

   Install injection pump

   Install the new or rebuilt injection pump, ensuring the timing gear is correctly aligned.

7. 7

   Reconnect and bleed system

   Reconnect all fuel lines and bleed the air from the fuel supply system.

8. 8

   Clear fault codes

   Reconnect the battery and use FENDIAS or SERDIA software to clear the 1.2.B6 fault code and verify normal operation.