John Deere 000611.04 – ECU: Supply Voltage to Injectors 1 and 4

The Engine Control Unit (ECU) has detected an improper voltage level in the electrical circuit supplying power to fuel injectors 1 and 4. This fault is commonly caused by the injector wiring being shorted to ground, meaning electrical current is diverted to the chassis ground before reaching the injectors. This disruption prevents the affected injectors from functioning correctly, leading to a loss of power and negatively impacting overall engine performance.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5075M
• 5090M
• 5095M
• 5100M
• 5105M
• 5115M
• 5120M
• 5130M
• 6100D
• 6110D
• 6115D
• 6125D
• 6130D
• 6230
• 6330
• 6430
• 9230
• 9330
• 9430
• 9530
• 9630
• PowerTech Plus 4045HF485
• PowerTech Plus 6068HF485

1. 1

   Visually inspect the wiring harness leading to injectors 1 and 4 for signs of damage, such as chafing, melting, or corrosion.

2. 2

   Check for a short to ground in the injector wiring harness using a multimeter to test for continuity between the power wire of the injector circuit and the chassis ground.

3. 3

   Inspect the electrical connectors at the ECU and the fuel injectors to ensure they are clean, secure, and free of damage or corrosion.

4. 4

   Verify that the machine's overall electrical system voltage is within the correct specifications, as low battery voltage can cause erratic sensor readings.

1. 1

   Isolate the fault

   Disconnect the wiring harness from the ECU and the injectors to test the harness independently. This helps determine if the fault lies within the harness, the ECU, or the injectors themselves.

2. 2

   Repair or replace wiring

   If a short or break is found in the wiring harness, repair the damaged section with appropriate materials or replace the entire fuel injector wiring harness.

3. 3

   Clean connections

   If connectors are found to be corroded during inspection, clean them carefully with an electrical contact cleaner.

4. 4

   Test injectors

   If wiring is intact, test the fuel injectors themselves for internal shorts, though this is less likely to be the cause of this specific voltage supply code.

5. 5

   Replace ECU

   If the wiring and injectors are confirmed to be in good condition and the fault persists, the ECU itself might be the source of the problem and may require replacement as a last resort.