Massey Ferguson E3031.02 – Engine Control Unit (ECU): Urea Tank Temperature Sensor error: J1939 error of Urea tank temp. signal

The Engine Electronic Management (EEM) system has detected that the temperature value reported by the Diesel Exhaust Fluid (DEF) tank temperature sensor is erratic, implausible, or changing at an abnormal rate.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 4707
• 4708
• 4709
• 4710
• 9540 Combines

1. 1

   Save and clear the error log using a diagnostic tool to see if the code is an active hard fault or an intermittent glitch.

2. 2

   Inspect the wiring harness and connections at the DEF tank header for loose contacts, chafing, corrosion, or open/short circuits.

3. 3

   Visually inspect the DEF tank and sensor housing for physical damage, cracks, or heavy corrosion.

4. 4

   Use a diagnostic tool to monitor live DEF tank temperature readings. If the sensor reports extreme negative or positive values compared to the actual physical temperature, the sensor has failed.

5. 5

   Check the DEF fluid for contamination from dirt, diesel, or water, which can foul the sensor array.

1. 1

   Turn off the machine and ensure the DEF system has completed its purge cycle (wait at least 5-10 minutes after shutdown).

   Wait at least 5-10 minutes after shutdown.

2. 2

   Thoroughly clean the area around the top of the DEF tank to prevent any dirt or debris from falling into the tank.

   Prevent any dirt or debris from falling into the tank.

3. 3

   Disconnect the electrical harness from the DEF header unit.

4. 4

   Disconnect the heated DEF supply and return lines. Cap the lines immediately to prevent contamination or crystallization.

   Cap the lines immediately to prevent contamination or crystallization.

5. 5

   Remove the mounting bolts securing the DEF header unit to the tank.

6. 6

   Carefully extract the old DEF header unit from the tank.

7. 7

   Install the new DEF header unit, ensuring the O-ring/gasket is properly seated to prevent leaks and moisture ingress.

   Ensure the O-ring/gasket is properly seated to prevent leaks and moisture ingress.

8. 8

   Reinstall the mounting bolts, reconnect the fluid lines, and plug in the electrical connector.

9. 9

   Use an electronic service tool to clear the E3031.02 fault code from the ECU and run the engine to verify the repair and exit the derate condition.

   Verify the repair and exit the derate condition.