Massey Ferguson E3361.06 – Engine ECU: DEF Injector Low Resistance

The Engine Control Unit has detected that the electrical resistance in the Diesel Exhaust Fluid (DEF) dosing injector circuit is too low, which typically points to a short circuit to ground on the low side of the circuit.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 4707
• MF 4708
• MF 4709
• MF 4710
• MF 5608
• MF 5609
• MF 5610
• MF 5611
• MF 5612
• MF 5613
• MF 5710 SL
• MF 5711 SL
• MF 5712 SL
• MF 5713 SL
• MF 7614
• MF 7615
• MF 7616
• MF 7618
• MF 7619
• MF 7620
• MF 7622
• MF 7624
• MF 7626
• MF 7714 through 7726S

1. 1

   Inspect the wiring harness between the Engine ECU and the DEF injector for any signs of chafing, melting, or damage that could cause a short circuit to ground (earth) or an open circuit.

2. 2

   Verify that the DEF injector is receiving the correct voltage and has a solid earth (ground) connection.

3. 3

   Disconnect the DEF injector and perform a direct resistance/continuity test on the injector's pins using a multimeter. If the resistance across the injector coil is out of specification (too low), the injector has failed internally.

1. 1

   Turn off the tractor and disconnect the battery

   Ensure safety while working on the electrical and emissions systems.

2. 2

   Locate the DEF Injector

   Find the AdBlue metering module on the exhaust SCR system (often integrated near the DOC/SCR canister).

3. 3

   Disconnect the electrical connector and inspect pins

   Check the pins for corrosion or DEF crystal intrusion.

4. 4

   Remove the mounting hardware

   If the diagnostic tests confirm the wiring is intact but the injector's internal resistance is low, remove the hardware securing the DEF injector to the exhaust system.

5. 5

   Remove the faulty DEF injector and clean the port

   Clean the mounting port of any crystallized DEF fluid or debris.

6. 6

   Install the new DEF injector module

   Torque the mounting hardware to OEM specifications.

7. 7

   Reconnect lines and connector

   Reconnect the DEF fluid lines and the electrical connector.

8. 8

   Clear the fault code and verify repair

   Reconnect the battery, turn on the machine, and use a diagnostic tool to clear the E3361.06 fault code from the Engine ECU. Run the engine to verify that the code does not return and the SCR system is dosing properly.