Fendt 1.2.D4 – A051 - ECU, engine control unit (EDC 7): Injector valve (Chip) faulty / High current output injector B (High)

Internal hardware failure within the engine control unit. The internal driver chip inside the ECU that supplies high current to the fuel injector(s) on bank B has failed or detected a critical internal fault.

• 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
• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 711 Vario COM III
• 815 Vario COM III
• 817 Vario COM III
• 916 Vario COM III
• 920 Vario COM III
• 924 Vario COM III
• 926 Vario COM III
• 930 Vario COM III
• 936 Vario COM III

1. 1

   Connect Fendt SERDIA diagnostic software and attempt to clear the error (FC:009E) to rule out transient voltage spikes triggering a false chip fault

2. 2

   Inspect the engine wiring harness between the A051 ECU and the fuel injectors for chafed wires or short circuits to ground/power (a dead short can overload the ECU driver chip)

3. 3

   Ohm test the fuel injectors to ensure an internally shorted injector coil did not cause the ECU chip failure

1. 1

   Clear fault code

   Connect the SERDIA diagnostic tool and attempt to clear the fault code.

2. 2

   Determine ECU replacement

   If the fault code cannot be deleted, the official repair procedure dictates that the engine control unit must be replaced.

3. 3

   Disconnect battery

   Disconnect the negative battery terminal.

4. 4

   Unplug ECU connectors

   Unplug the main harness connectors from the A051 EDC 7 control unit (note: on most models except the 300/400 series, the ECU is cooled by the fuel return system, so fuel lines may need to be disconnected and capped).

5. 5

   Replace ECU

   Remove the faulty ECU and install the replacement unit.

6. 6

   Program new ECU

   The new A051 ECU must undergo EOL (End of Line) programming using FENDIAS/SERDIA to flash the correct engine data record and parameters specific to the tractor's chassis number.