Fendt 1.2.62 – A051 - ECU, engine control unit (EDC 7): Misfiring on cylinder 2

The system has detected that the number of misfires on the second cylinder has exceeded the allowed limit value.

• 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

1. 1

   Connect the Fendt SERDIA diagnostic software to confirm the presence of active fault code 1.2.62 (Internal Failure Code / FC: 0027)

2. 2

   Check the wiring harness and connectors leading from the EDC 7 ECU to the cylinder 2 fuel injector for cable breaks, short circuits to the battery, or shorts to ground

3. 3

   Test the cylinder 2 fuel injector for proper electrical resistance and mechanical operation

4. 4

   Verify that the fuel rail pressure is within the target range, as rail pressure issues can sometimes trigger misfire codes

5. 5

   If wiring and injector test fine, verify the EDC 7 ECU for an internal circuit failure (loss of injector control)

1. 1

   Power Down

   Turn off the tractor and disconnect the battery before working on the engine wiring or fuel system.

2. 2

   Repair Wiring

   If a short or break was found during the diagnostic phase, repair or replace the affected section of the injector wiring harness.

3. 3

   Replace Injector

   If the cylinder 2 injector failed testing, depressurize the fuel system, remove the high-pressure fuel lines, and extract the faulty injector. Install the new injector with new seating washers and O-rings.

4. 4

   ECU Repair/Replacement (If necessary)

   If the fault is traced to the A051 ECU, the Bosch EDC7UC31 unit must be removed. It will either need to be sent to a specialist for internal component repair or replaced with a donor unit. Note: A replacement ECU must be cloned or undergo EOL (End of Line) programming using the SERDIA tool to match the tractor's immobilizer and parameters.

5. 5

   Clear Codes

   Reconnect the battery. The fault code will not clear itself automatically. You must use the SERDIA diagnostic software to delete the error from the A051 memory.