John Deere 652.06 – ECU: Injector Number 2 Low Resistance Error / Cylinder #2 Electronic Injector Circuit Shorted

The controller detects that the electrical current to the Cylinder #2 fuel injector is increasing too rapidly. This indicates a short circuit (low resistance) either in the wiring harness leading to the injector or within the injector's internal solenoid.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7720
• 7810
• 7820
• 7920
• 4930
• 444J
• 544J
• 624J
• 750J
• 850J
• 9560 STS
• 9650 STS
• 9750 STS
• 8120
• 8130
• 8295R
• 8320
• 8330
• 8420
• 8530
• 9560
• 9660
• 9670

1. 1

   Cycle power by restarting the engine to verify if the active Service Code reappears, as communication messages can trigger a false alert.

2. 2

   Inspect the wiring harness connecting the ECU to the Cylinder #2 injector for chafed wires, melted insulation, or pinched lines that could cause a short to ground or a short to another wire.

3. 3

   Disconnect the electrical connector at the Cylinder #2 injector and use a multimeter to measure the resistance across the injector's solenoid pins. Compare the reading to the OEM specification to determine if the injector has failed internally.

1. 1

   Isolate the Short

   If the injector solenoid tests within specification, the short is in the wiring harness. Repair or replace the damaged section of the engine wiring harness.

2. 2

   Replace the Injector

   If the injector solenoid fails the resistance test (shows a dead short or abnormally low resistance), the Cylinder #2 fuel injector must be replaced.

3. 3

   Install New Injector

   Remove the faulty injector and install the replacement according to the engine-specific service manual. Ensure all O-rings and seals are new and properly lubricated.

4. 4

   Calibration

   Note that some John Deere systems require the new injector's calibration code (QR code or alphanumeric string on the injector body) to be programmed into the ECU using a diagnostic tool (Service ADVISOR) to ensure proper fueling.

5. 5

   Clear Codes

   Clear the ECU fault codes and test-run the machine to verify the repair.