Fendt 1.2.82 – EDC (Electronic Diesel Control): Fault in high-pressure solenoid valve actuation time / Supply time High pressure solenoid valve not adequate

The pump's internal control unit has detected that the high-pressure solenoid valve is not actuating within the required time frame. This leads to a deviation in the start of injection or inadequate fuel delivery, causing the engine to stall, cut out, or fail to start.

• 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
• Favorit 815 Vario
• Favorit 817 Vario
• Favorit 818 Vario
• Favorit 916 Vario
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• Favorit 924 Vario
• Favorit 926 Vario
• Favorit 930 Vario

1. 1

   Check primary fuel pressure from the lift/feed pump to ensure adequate supply, as fuel starvation can trigger actuation faults

2. 2

   Inspect the wiring harness and connections between the main EDC control module and the injection pump control unit for chafing, corrosion, or loose pins

3. 3

   Verify that the pump control unit is receiving proper voltage and has a clean ground

4. 4

   Check for accompanying CAN-bus communication codes (e.g., 1.2.1F / A021) which might indicate a wiring failure rather than an internal pump failure

1. 1

   Disconnect battery

   Disconnect the battery to prevent electrical shorts.

2. 2

   Clean injection pump area

   Clean the area around the injection pump thoroughly to prevent dirt from entering the fuel system.

3. 3

   Disconnect electrical connectors

   Disconnect the electrical harness connectors from the injection pump control unit.

4. 4

   Remove high-pressure lines

   Remove the high-pressure injection lines and cap all open ports immediately.

5. 5

   Lock engine at TDC

   Lock the engine at top dead center (TDC) according to the MAN/Fendt engine service manual to ensure timing is maintained.

6. 6

   Remove injection pump

   Remove the injection pump mounting hardware and extract the Bosch VP44 injection pump.

7. 7

   Install replacement pump

   Install the replacement or remanufactured VP44 injection pump, ensuring the timing gear aligns perfectly with the engine's timing marks.

8. 8

   Reconnect lines and connectors

   Reconnect all high-pressure lines, low-pressure feed lines, and electrical connectors.

9. 9

   Bleed fuel system

   Bleed the fuel system thoroughly to remove all air.

10. 10

    Test run tractor

    Reconnect the battery, clear the EDC fault codes using the FENDIAS diagnostic tool, and test run the tractor to verify the repair.