Fendt 1E.1.80 – A051 - ECU, engine control unit (EDC 7): Short circuit or break in wiring to injector valve 5

The engine control unit detects an open circuit (break) or a short circuit in the electrical circuit for the cylinder 5 fuel injector, resulting in an injection failure (cylinder switch-off/misfiring), loss of power, and rough engine operation.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 900 Vario Series (COM III)
• 920 Vario
• 922 Vario
• 924 Vario
• 927 Vario
• 930 Vario
• 933 Vario
• 936 Vario
• 300 Vario Series (COM III)
• 700 Vario Series
• 716 Vario
• 718 Vario

1. 1

   Visually inspect the wiring harness running from the EDC 7 ECU (Connector A) to the cylinder 5 injector for chafed wires, melted insulation, or breaks.

2. 2

   Disconnect the plug at injector 5 and check for oil ingress, water ingress, or bent/corroded pins.

3. 3

   Probe the two terminals on the injector solenoid coil with a multimeter set to Ohms (Ω). A reading of zero indicates a short circuit inside the injector, while an infinite reading indicates an open circuit (dead solenoid). Expected range is typically 0.4–2.0 ohms.

4. 4

   If the injector tests fine, check the continuity of the wiring from the injector plug back to the EDC 7 ECU pins to isolate a broken wire.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical spikes during repair.

2. 2

   Repair Wiring

   If the diagnostic tests revealed a broken or shorted wire, splice and repair the damaged section of the harness. If the connector plug is heavily damaged or oil-soaked, splice in a new injector pigtail connector or an EDC7 repair harness.

3. 3

   Replace Injector

   Clean the area around injector 5 to prevent debris from falling into the cylinder. Use a wrench to loosen and remove the high-pressure fuel lines connected to the injector. Remove the injector retainer bow/nut and carefully pull the faulty injector from the cylinder head. Install the new injector using a new sealing washer and O-ring. Reinstall the retainer bow/nut and torque to OEM specifications. Reconnect the fuel lines and tighten the nuts, then reconnect the electrical connector to the injector.

4. 4

   Clear Codes & Test

   Reconnect the battery. Use the Fendt SERDIA diagnostic software to delete the stored fault codes (FC:00A7, 00A8) from the A051 module. Start the engine and check for fuel leaks and smooth operation.