John Deere 000652.05 – ECU: Injector Number 2 High Resistance Error

The Engine Control Unit (ECU) has detected a high resistance or open circuit condition in the electrical circuit of the number 2 fuel injector. The current flowing to the injector is less than expected. This condition affects the proper operation of the engine and can lead to performance issues.

• 6020
• 6120
• 6215
• 6220
• 6320
• 6415
• 6420
• 6520
• 6615
• 6715
• 7220
• 7320
• 7405
• 7420
• 7520
• 7610
• 7815
• 310G
• 310J
• 310SJ
• 410G
• 410J
• 710D
• 710G
• 710J
• 450H
• 450J
• 550H
• 550J
• 650H
• 650J
• 700H
• 700J
• 750J
• 850J
• 120C
• 120D
• 160C
• 200CLC
• 200LC
• 230CLC
• 270CLC
• 444J
• 524K-II
• 544J
• 544K-II
• 624H
• 624J
• 624K

1. 1

   Ensure the engine is off and the battery is disconnected for safety before beginning diagnostics

2. 2

   Visually inspect the wiring harness and connectors between the ECU and the number 2 fuel injector for damage, corrosion, loose connections, or chafing

3. 3

   Perform an Injector Resistance Test: Disconnect the electrical connector from the number 2 fuel injector and measure the resistance between the two metal terminals on the injector (a reading of less than 2 ohms suggests a faulty injector)

4. 4

   Perform a Wiring Harness Resistance Test: If the injector resistance is greater than 2 ohms, measure the resistance of the electronic fuel injector wiring harness (a reading of less than 2 ohms indicates a faulty harness)

5. 5

   Inspect the main engine wiring harness connector (J01) and the corresponding connector on the ECU for damaged or loose pins and sockets

1. 1

   Address Visual Inspection Findings

   If any damage, corrosion, or loose connections are found during the visual inspection, repair or replace the affected wiring or connectors. Ensure all connections are clean and secure.

2. 2

   Test Injector and Harness

   Follow the diagnostic resistance tests outlined above.

3. 3

   Replace Faulty Component

   If the resistance measurement of the #2 fuel injector is less than 2 ohms, replace the fuel injector. If the injector tests okay but the wiring harness resistance is less than 2 ohms, replace the electronic fuel injector wiring harness. If the main ECU connector (J01) or the engine harness connector is found to be damaged, replace the respective harness or the ECU.

4. 4

   Clear Codes and Verify Repair

   After replacing the faulty component, reconnect all connectors and the battery. Start the engine and use a diagnostic tool to clear the fault code. Operate the machine to ensure the code does not return.