Fendt 1E.1.7E – A051 - ECU, Engine Control Unit (EDC 7): A051 - Injector 3: Short circuit or cable break to injector 3

This indicates an electrical fault (either an open circuit or a short) in the circuit for the number 3 cylinder fuel injector (Component designation: Y097). The direct consequence of this condition is an injection failure (misfire) on cylinder 3, which will result in reduced engine performance and rough running.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 300 Vario COM III
• Fendt 309 Vario COM III
• Fendt 310 Vario COM III
• Fendt 311 Vario COM III
• Fendt 312 Vario COM III
• Fendt 400 Vario COM III
• Fendt 700 Vario COM III
• Fendt 800 Vario COM III
• Fendt 900 Vario COM III
• Fendt 919 Vario COM III
• Fendt 922 Vario COM III
• Fendt 924 Vario COM III
• Fendt 927 Vario COM III
• Fendt 930 Vario COM III
• Fendt 933 Vario COM III
• Fendt 936 Vario COM III

1. 1

   Check ECU Pin Resistance: Disconnect the harness at separation point X1672 on the A051 Engine ECU. Measure the resistance between Pin 4 (Injector 1, 2, 3 High) and Pin 6 (Injector 3 Low). The specified target value is approximately 0.5 ohms.

2. 2

   Check Cylinder Head Separation Point: Check the wiring at separation point X1662, which is the connection point for the injectors (Y095, Y096, Y097, Y098) located inside the cylinder head.

3. 3

   Inspect for Shorts: Test the wiring between the A051 ECU and the Y097 injector for continuity to ground or a short to voltage.

1. 1

   Depressurize the System

   Turn off the engine and wait at least 30 seconds before starting any work on the fuel system to allow the high-pressure accumulator (rail) to depressurize. Ensure strict cleanliness around the fuel system.

2. 2

   Access the Injector

   Open the bonnet. The injectors on these engines are located under the valve cover. Unscrew and remove the engine valve cover to access Injector 3 (Y097) and the internal wiring harness (X1662 separation point).

3. 3

   Inspect and Repair

   Visually inspect the wiring harness leading to Injector 3 for chafing, breaks, or heat damage.

4. 4

   Replace Component

   If the wiring tests perfectly but the resistance across the injector solenoid is out of specification (not ~0.5 ohms), remove and replace Injector 3 (Y097).

5. 5

   Reassembly

   Reinstall the valve cover using a new valve cover gasket. Reconnect all electrical separation points.

6. 6

   Clear Codes

   Connect the SERDIA / FENDIAS diagnostic tool and delete the error code from the A051 ECU memory.