Fendt 1.2.7C – A051 - ECU, engine control unit (EDC 7): Short circuit or break in wiring to injector valve 1

The engine control system has detected an electrical fault—either an open circuit (broken wire) or a short circuit—in the circuit responsible for firing the fuel injector on cylinder 1.

• 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 SERDIA diagnostic tool to verify the active fault code (FC: 009F or 00A0).

2. 2

   Locate the A051 EDC 7 control unit and Injector Valve 1 (Y095) on the flywheel side of the engine.

3. 3

   Disconnect the wiring harness from the A051 ECU and measure resistance between Pin 4 (Injector 1, 2, 3 high) and Pin 13 (Injector 1 low). The specified resistance is exactly 0.5 ohms.

4. 4

   If resistance is out of specification, inspect the physical wiring harness between the ECU and the Y095 injector for chafing, pinched wires, or disconnected plugs.

1. 1

   Disconnect Power

   Disconnect the tractor's battery before performing electrical repairs.

2. 2

   Isolate the Fault

   Based on the resistance test, determine if the fault lies in the wiring harness or the injector itself. If the wiring is damaged: Repair the broken/shorted wires in the harness or replace the engine wiring harness section leading to injector 1. If the wiring tests good but resistance is incorrect: The Y095 injector valve has failed internally and must be replaced.

3. 3

   Reassembly

   Reconnect the injector plug and the A051 ECU connectors. Reconnect the battery.

4. 4

   Clear Codes

   Connect the SERDIA diagnostic software and execute the 'delete error' command to clear the fault from the A051 ECU memory.

5. 5

   Verification

   Start the engine and verify that it runs smoothly without logging the 1.2.7C code again.