Fendt 1.2.7E – A051 - ECU, engine control unit (EDC 7): Short circuit or break in wiring to injector valve 3

The engine enters an emergency operating mode. The system limits torque, and the high-pressure relief valve may open. Because the fuel heats up strongly when the relief valve is open, the engine will only run for a maximum of 4 minutes before the system automatically shuts it down to prevent damage.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)
• Fendt 309
• Fendt 310
• Fendt 311
• Fendt 312
• Fendt 712
• Fendt 714
• Fendt 716
• Fendt 724 Vario
• Fendt 916
• Fendt 920
• Fendt 924
• Fendt 926
• Fendt 930

1. 1

   Visually inspect the wiring harness between the A051 ECU (connector X1466) and Injector Valve 3 (connector X1673) for chafing, breaks, or melted insulation.

2. 2

   Disconnect the electrical connector at injector 3 and measure the resistance across the injector coil pins using a multimeter (should be approximately 0.5 ohms).

3. 3

   Test the wiring harness from the ECU to the injector for continuity, and ensure there is no short circuit to ground or to the battery voltage.

1. 1

   Preparation

   Disconnect the tractor's battery. Thoroughly clean the engine area around the injectors.

2. 2

   Removal

   Remove the valve cover or access panels as required by your specific engine model.

3. 3

   Disconnect

   Disconnect the electrical connector from Injector 3 (Y097).

4. 4

   Remove

   Remove the high-pressure fuel line connected to the injector. Cap all open fuel ports immediately.

5. 5

   Remove

   Remove the injector hold-down clamp/bracket.

6. 6

   Extract

   Carefully extract the injector from the cylinder head. (Note: Depending on the Deutz engine model, such as the TCD 2013, you may also need to inspect or replace the injector cooling sleeve if leaks are present).

7. 7

   Installation

   Install the new injector using new O-rings and a new copper sealing washer.

8. 8

   Reinstall

   Reinstall the hold-down clamp and torque the mounting bolts to the manufacturer's exact specifications.

9. 9

   Reconnect

   Reconnect the high-pressure fuel line and the electrical connector.

10. 10

    Clear Codes

    Connect a diagnostic laptop with SERDIA (Fendt/Deutz diagnostic software) to the tractor. Delete the stored error codes (FC:00A3, 00A4) from the A051 ECU.

11. 11

    Test

    Test run the tractor to ensure the engine operates normally and does not revert to the 4-minute emergency shutdown mode.