Massey Ferguson 004363.04 – ECU: Issue With The DOC Outlet Temperature Sensor

The Engine Control Unit (ECU) has detected an implausible or missing signal from the SCR outlet temperature sensor. This sensor monitors the exhaust gas temperature exiting the SCR catalyst, which is critical for proper Diesel Exhaust Fluid (DEF) injection and NOx conversion. A failure in this circuit can lead to reduced engine power or limp mode to protect the aftertreatment system and maintain emissions compliance.

• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 4707
• 4708
• 4709
• 4710

1. 1

   Visually inspect the DOC outlet temperature sensor and its wiring harness for frayed wires, corrosion on connectors, or a damaged sensor probe.

2. 2

   Check the sensor wiring for a short circuit to ground, as the below-normal voltage strongly suggests this condition.

3. 3

   Perform a sensor rationality check using a diagnostic tool by comparing the DOC inlet and outlet temperature readings against each other and other engine parameters for unexpected differences.

4. 4

   Consult official Massey Ferguson service manuals for detailed diagnostic procedures and specifications.

1. 1

   Confirm the Fault

   Use a diagnostic tool to confirm that fault code 004363.04 is active.

2. 2

   Perform Diagnostic Checks

   Follow the diagnostic checks listed above to isolate the root cause of the fault.

3. 3

   Repair Wiring

   If a wiring issue (short circuit, open circuit, or corrosion) is found, repair or replace the affected section of the harness.

4. 4

   Replace the Sensor

   If the sensor itself is determined to be faulty, allow the exhaust system to cool completely. Disconnect the sensor's electrical connector, use the appropriate wrench to carefully remove the old sensor, apply an anti-seize compound to the threads of the new sensor (if not pre-applied), install the new sensor and tighten it to the manufacturer's specified torque (25 N·m to 34 N·m for similar sensors), and reconnect the electrical connector.

5. 5

   Clear Fault Codes

   After the repair is complete, use a diagnostic tool to clear the fault code from the ECU's memory.

6. 6

   Verify the Repair

   Operate the machine under normal conditions to ensure that the fault code does not reappear.