Fendt 1.2.B9 – EDC (Electronic Diesel Control) module: Pump control unit (injection pump) (EDC) — Fault during injection pump self-diagnostic test (RAM fault)
Issue description
The internal Random Access Memory (RAM) within the injection pump's control unit has failed its automated self-diagnostic check. Because the control unit cannot reliably process fuel delivery data, the engine control system will intervene, resulting in the engine stopping or failing to start.
Applies to these machines
34 machines- 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
- Farmer 410
- Farmer 411
- Farmer 412
- Favorit 711
- Favorit 712
- Favorit 714
- Favorit 715
- Favorit 716
- Favorit 717
- 815 Vario
- 817 Vario
- 818 Vario
- Favorit 916
- Favorit 920
- Favorit 924
- Favorit 926
- Favorit 930
Check the cause
Verify the battery voltage, power supply, and fuses for the CAN bus circuit board and EDC control module to rule out transient voltage spikes.
Inspect the wiring continuity and connectors between the Pump Control Module (A020) and the EDC Control Module (A021).
Connect the FENDIAS diagnostic tool, record the failure and ambient parameters, delete the failure code memory, cycle the ignition/engine, and check if the code returns.
Repair steps
Clear fault code memory
Connect the FENDIAS diagnostic tool and clear the fault code memory.
Trigger self-diagnostic test
Attempt to start the engine to trigger the pump's self-diagnostic test.
Verify failure
If the failure persists and no external wiring/voltage issues are identified, the pump control unit (A020) has failed.
Replace injection pump assembly
Because the A020 control unit is integrated into the Bosch VP44 injection pump, the standard repair is to replace the entire injection pump assembly.
Dismount old pump
Dismount the old fuel injection pump (VP44) according to the mechanical timing procedures in the workshop manual.
Mount replacement pump
Mount the replacement VP44 injection pump, ensuring the start of delivery timing is correctly set.
Bleed fuel system and verify
Bleed the fuel system and use FENDIAS to clear any remaining codes and verify operation.
Parts you might need
(7)Electronic Fuel Injection Pump (Bosch VP44)
F926202710740Fendt / AGCO OEM Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
FCU926202520000Fendt / AGCO OEM Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
Z926202710740Fendt / AGCO OEM Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
0470506045Bosch Manufacturer Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
0986444064Bosch Manufacturer Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
0986444091Bosch Manufacturer Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
Electronic Fuel Injection Pump (Bosch VP44)
0470506042Bosch Manufacturer Part. Used on MAN and Deutz engines. Sold as professionally remanufactured units on an exchange basis (core charge applies, old unit must be returned).
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