Fendt A020 – EDC: Pump Control Unit Signal Processing Issue

The fault indicates a problem with signal processing within the Electronic Diesel Control (EDC) system related to the injection pump (pump control unit). This can be caused by internal memory failures (RAM or EEPROM), power supply interruptions, CAN bus communication loss with the main EDC module, or injection start system deviations (related to the needle movement sensor). This issue affects the proper operation of the system relying on the pump control unit's signals, resulting in severe consequences such as reduced engine power, forced idle (720 RPM), stalling, or a complete no-start condition.

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1. 1

   Read all active and stored fault codes from the EDC module using a diagnostic tool (like FENDIAS) to get a complete picture of the issue

2. 2

   Check the fuel supply system to ensure adequate fuel delivery and inspect for clogged fuel lines or filters

3. 3

   Inspect electrical wiring and connectors between the main EDC control module (A021) and the injection pump/pump control unit (A020) for damage, corrosion, or loose connections

4. 4

   Verify power and ground connections to the injection pump if a power supply failure is suspected

1. 1

   Clear fault codes

   Connect a diagnostic tool to read and delete the fault code memory.

2. 2

   Attempt engine start

   Attempt to start the engine.

3. 3

   Inspect starter system

   If the engine does not start, check the starter, its connections, and electrical control.

4. 4

   Verify fuel supply

   If the starter is functional but the engine still does not start, check the entire fuel supply system.

5. 5

   Check connections and software

   If the fault code A020 persists after clearing and the fuel system is confirmed to be working, check connections and software.

6. 6

   Replace injection pump

   If the failure persists after checking connections and software, replace the injection pump (which contains the pump control unit).

7. 7

   Replace EDC Control Module

   If replacing the injection pump does not resolve the issue, the main EDC Control Module itself may need replacement.