Fendt 1E.1.73 – A051 - ECU, engine control unit (EDC 7): Start of injection period in cylinder 4 outside setpoint range or absent

The engine control module is detecting that the fuel injector for cylinder 4 is either not firing, firing at the incorrect time, or has an electrical fault preventing the injection event from being verified. When this fault occurs, the tractor may enter an emergency operating mode (power reduction) or shut off the cylinder entirely.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 300 Vario COM III
• 400 Vario COM III
• 411 Vario COM III
• 412 Vario COM III
• 700 Vario COM III
• 711 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 800 Vario COM III
• 815 Vario COM III
• 817 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• 900 Vario COM III
• 916 Vario COM III

1. 1

   Connect the Fendt SERDIA diagnostics program to read measured values for the A051 Engine Control Unit and perform a functional test of the cylinder 4 injector

2. 2

   Inspect the wiring harness between the A051 ECU and the cylinder 4 fuel injector for chafed wires, short circuits, or open circuits

3. 3

   Disconnect the cylinder 4 injector and check the connector pins for corrosion, pushed-out terminals, or poor tension

1. 1

   Test the Circuit

   Using a multimeter, verify continuity and check for shorts to ground or power on the cylinder 4 injector circuit back to the A051 ECU.

2. 2

   Repair Wiring

   If a break or short is found in the harness, repair the wiring or replace the injector harness section.

3. 3

   Replace Injector

   If the wiring and ECU outputs test good but the injector fails the SERDIA functional test or has failed internally, remove and replace the cylinder 4 fuel injector.

4. 4

   Clear Faults

   Connect the SERDIA diagnostic tool and delete the error (Internal SERDIA Fault Code: FC:001B). Note: Canceling a fault message on the dash does not remove the fault from the EDC memory; it must be cleared via SERDIA.

5. 5

   Test Run

   Start the tractor and verify that the engine runs smoothly without misfires and that the emergency operating mode (power reduction) has been deactivated.