Fendt 1E.1.7D – A051 - ECU, engine control unit (EDC 7): Short circuit or break in wiring to injector valve 2

An electrical fault (either an open circuit or a short) in the circuit controlling the #2 cylinder fuel injector, which results in an injection failure for that cylinder.

• 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
• Fendt 400 Vario COM III
• Fendt 700 Vario COM III
• Fendt 800 Vario COM III
• Fendt 900 Vario COM III

1. 1

   Inspect the wiring harness running from the A051 Engine Control Unit (EDC 7) to injector valve 2 for chafed wires, melted insulation, or breaks.

2. 2

   Disconnect the plug at injector 2 and check for corrosion, bent pins, or moisture ingress.

3. 3

   Use a multimeter to test the wiring between the EDC 7 harness connector and the injector connector for continuity and ensure there is no short to ground or short to voltage.

4. 4

   Measure the internal resistance of injector 2 across its pins to determine if the solenoid/piezo stack has failed internally, causing the short/open circuit.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery before working on the engine control wiring or fuel system. Wait at least 30 seconds for the high-pressure fuel system to depressurize.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a broken or shorted wire, repair the wiring harness or replace the injector pigtail connector.

3. 3

   Replace Injector

   If the wiring is intact but the injector failed the resistance test, remove the high-pressure fuel line and retaining clamp, and extract injector 2. Install a new injector with new seating washers and O-rings.

4. 4

   Reassemble

   Reconnect the injector harness and the battery.

5. 5

   Clear Fault Codes

   Connect the Fendt SERDIA diagnostic software to the tractor and manually delete the error code from the engine control unit memory.