Fendt 1.2.65 – A051 - ECU, engine control unit (EDC 7): Misfiring on cylinder 5

The engine control unit has detected that cylinder number 5 is not contributing to engine power properly, which is typically caused by a fuel delivery issue, a faulty injector, or an electrical fault in the injector wiring circuit. The specific internal failure code (FC) associated with this in the diagnostic software is FC:002A.

• 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 309 Vario COM III
• Fendt 310 Vario COM III
• Fendt 311 Vario COM III
• Fendt 312 Vario COM III
• Fendt 411 Vario COM III
• Fendt 412 Vario COM III
• Fendt 413 Vario COM III
• Fendt 414 Vario COM III
• Fendt 415 Vario COM III
• Fendt 712 Vario COM III
• Fendt 714 Vario COM III
• Fendt 716 Vario COM III
• Fendt 718 Vario COM III
• Fendt 818 Vario COM III
• Fendt 820 Vario COM III
• Fendt 919 Vario COM III
• Fendt 922 Vario COM III
• Fendt 924 Vario COM III
• Fendt 925 Vario COM III
• Fendt 927 Vario COM III
• Fendt 928 Vario COM III
• Fendt 930 Vario COM III
• Fendt 931 Vario COM III
• Fendt 933 Vario COM III
• Fendt 934 Vario COM III
• Fendt 936 Vario COM III

1. 1

   Connect a diagnostic tool with FENDIAS or SERDIA software to read active faults

2. 2

   Attempt to clear the error (SERDIA delete error) to see if the misfire is a hard, active fault or an intermittent historical code

3. 3

   Check the wiring harness and connectors leading from the A051 Engine ECU to the cylinder 5 fuel injector for breaks, corrosion, or short circuits to the battery/earth

4. 4

   Verify the fuel supply system, ensuring there is no air in the fuel lines and that the rail pressure is within the setpoint range

5. 5

   If the wiring and fuel supply are intact, suspect an internal failure of the cylinder 5 fuel injector

1. 1

   Turn off the tractor, disconnect the battery, and remove any necessary engine cowling/panels.

   This is required to access the engine valve cover and fuel rail.

2. 2

   Inspect the wiring harness leading to the cylinder 5 injector.

   Repair any chafed wires or replace the connector if damaged.

3. 3

   Relieve the fuel system pressure and remove the high-pressure fuel line connected to the cylinder 5 injector.

   Perform this step if the wiring is good.

4. 4

   Remove the faulty cylinder 5 fuel injector.

5. 5

   Clean the injector bore in the cylinder head thoroughly.

   Ensure no carbon deposits or debris fall into the cylinder.

6. 6

   Install the new fuel injector with a new sealing washer/O-rings.

7. 7

   Reinstall the high-pressure fuel line and torque all fittings to the manufacturer's specifications.

8. 8

   Reconnect the electrical connector to the injector.

9. 9

   Reconnect the battery, bleed the fuel system if necessary, and start the engine.

10. 10

    Connect the SERDIA/FENDIAS diagnostic tool, clear the FC:002A fault code, and run the engine.

    Verify the misfire is resolved.