Massey Ferguson 3361.06 – Engine Control Unit (ECU): DEF Dosing Injector Circuit Has Low Resistance

The electrical resistance in the Diesel Exhaust Fluid (DEF) dosing injector circuit has dropped below the acceptable threshold, indicating a short circuit to ground within the injector itself or its wiring harness.

• 4710
• 7724S
• 5712SL
• Interim Tier 4 (2012-2015)
• 7722
• 7722S
• 7615
• 5613
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7616
• 7618
• 5608
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 5711SL
• 7614
• 7718S
• 5610
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 5612
• 7622
• 7720
• Tier 4 (2015-2021)
• 5611
• 7715S
• 5609
• 7724

1. 1

   Inspect the wiring harness leading from the Engine ECU to the DEF dosing injector for chafing, melted insulation, or physical damage that could cause a short to ground.

2. 2

   Disconnect the DEF injector and use a multimeter to test the harness for continuity to ground.

3. 3

   Measure the internal resistance of the DEF dosing injector pins. If the resistance is below the manufacturer's specified range, the injector has an internal short.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical spikes.

2. 2

   Address Wiring

   If the diagnostic tests revealed a short in the wiring harness, repair the damaged wires or replace the harness section.

3. 3

   Replace the Injector

   If the wiring is intact but the injector failed the resistance test, remove the faulty DEF dosing injector from the exhaust aftertreatment system.

4. 4

   Install New Component

   Install the replacement DEF dosing injector and securely reconnect the electrical harness.

5. 5

   Clear and Verify

   Reconnect the battery, clear the 003361.06 fault code from the ECU using a diagnostic tool, and run the engine to verify that the code does not return and that the DEF system is dosing correctly.