John Deere 3361.04 – ECU: DEF Dosing Injector Signal Out of Range Low

This code indicates that the electrical signal to the Diesel Exhaust Fluid (DEF) dosing injector has fallen below the acceptable range, which specifically points to a short to ground in the circuit. Because of this short, the injector may not receive the proper voltage to operate, leading to under-dosing of DEF fluid into the exhaust stream, preventing proper NOx reduction, and triggering an engine derate.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5090M
• 5100M
• 5100MH
• 5100ML
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8245R
• 8270R
• 8295R
• 9470RT
• 9520RT
• 9570RT
• 6105M
• 744K
• 750K
• 824K
• 844K
• 850K
• 1050K
• 130G
• 135G
• 160G LC
• 180G LC
• 190GW
• 245G
• 345G LC
• 670G
• 870G

1. 1

   Read all active fault codes to check for related issues like low DEF pressure or other circuit resistance codes.

2. 2

   Inspect the wiring harness leading to the DEF dosing injector for chafed wires, melted insulation, loose connections, or corroded contacts grounding against the chassis.

3. 3

   Use a digital multimeter to test the electrical output at the injector connector, verifying low signal levels and checking for continuity to ground.

4. 4

   Inspect the DEF injector for heavy crystallization, physical damage, or an internal solenoid short.

1. 1

   Resolve Electrical Shorts

   If the multimeter test reveals a wiring issue, repair the short to ground by fixing or replacing the damaged wires and connectors in the harness.

2. 2

   Replace the Injector

   If the wiring harness tests fine but the injector solenoid is internally shorted to ground, the DEF dosing injector must be replaced. Carefully detach the existing injector, noting its placement. Install the new injector and tighten bolts to the manufacturer's specified torque.

3. 3

   Reset the ECU

   After making the necessary electrical or component repairs, clear the error state by resetting the ECU.

4. 4

   System Test

   Reconnect the power supply, start the machine, and conduct a system check (or a forced DPF/SCR regeneration using a diagnostic tool) to ensure the DEF dosing system is functioning properly without leaks or returning codes.