Fendt 1E.1.7A – A051 - ECU, engine control unit (EDC 7): Short circuit in cylinder bank 2 injector valves

Short circuit detected, resulting in a cylinder switch-off to protect the engine and electrical components from further damage.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 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
• 916
• 920
• 926

1. 1

   Connect the Fendt SERDIA diagnostic software to confirm the active fault code (FC:009B)

2. 2

   Inspect the A051 (EDC 7) control unit connectors, specifically Socket D2.3 (89-pin), for water ingress, oil ingress, bent pins, or damage

3. 3

   Trace the wiring harness from the EDC 7 ECU to the fuel injectors on cylinder bank 2 and use a multimeter to check for a short to ground or power

4. 4

   Test the electrical resistance of the individual injector valves on cylinder bank 2 to determine if the short circuit is internal to the injector solenoid

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical arcing or further damage to the EDC 7 ECU.

2. 2

   Isolate the Short

   Disconnect the injector wiring harness from both the EDC 7 ECU (Socket D2.3) and the injectors on cylinder bank 2.

3. 3

   Repair/Replace Components

   If the harness is shorted: Repair the chafed/damaged section of the wiring. If the connector or a large portion of the loom is damaged by oil/water, splice in an EDC7 89-way repair harness loom. If an injector is shorted: Remove and replace the faulty fuel injector on cylinder bank 2.

4. 4

   Reassemble

   Reconnect the injector harness to the injectors and the EDC 7 ECU, ensuring the connector is fully seated and locked to prevent moisture ingress.

5. 5

   Clear Codes

   Reconnect the battery. Connect the SERDIA diagnostic tool and delete the error code from the A051 ECU memory. (Note: The code must be deleted via SERDIA; it will not clear itself just by fixing the physical fault).

6. 6

   Test Run

   Start the engine and verify that the cylinder switch-off condition is resolved and full power is restored.