New Holland ENG 3074 – Engine Control Unit (ECU) / Bosch EDC7: Injector solenoid valve Cylinder 6 - SOURCE LOW

The engine control system has detected a short circuit to ground or a low signal voltage on the electronic fuel injector circuit specifically for cylinder number 6.

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1. 1

   Check the wiring harness between the EDC7 ECU and the cylinder 6 injector for chafing, bare wires, or a short circuit to ground.

2. 2

   Inspect the connections at the EDC ECU (specifically Connector A, which handles the electro-injectors) and the pass-through connector at the cylinder head.

3. 3

   Measure the resistance (Ohms) of the cylinder 6 injector coil. If the coil resistance is out of specification, the injector has an internal short and must be replaced.

1. 1

   Disconnect battery

   Disconnect the battery's negative terminal to prevent electrical arcing.

2. 2

   Remove valve cover

   Remove the engine valve cover to access the fuel injectors.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector from the cylinder 6 injector.

4. 4

   Remove fuel line

   Remove the high-pressure fuel line (tube) connected to cylinder 6.

5. 5

   Remove hold-down clamp

   Remove the injector hold-down clamp.

6. 6

   Extract faulty injector

   Extract the faulty injector. (OEM documentation recommends using special tool 99342101 to safely remove and fit the injector into its seat).

7. 7

   Prepare new injector

   Prepare the new injector: Fit a new sealing ring lubricated with petroleum jelly and a new copper sealing washer on the injector.

8. 8

   Install new injector

   Install the new injector into the cylinder head seat. Ensure it is directed so that the fuel inlet hole is facing the fuel manifold seat side.

9. 9

   Reinstall hold-down clamp

   Reinstall the hold-down clamp and torque to OEM specifications.

10. 10

    Reconnect fuel line and connector

    Reconnect the high-pressure fuel line and the electrical connector.

11. 11

    Reinstall valve cover

    Reinstall the valve cover with a new gasket.

12. 12

    Finalize repair

    Reconnect the battery, bleed the fuel system, and clear the fault codes using a diagnostic tool or the Blink Code key procedure.