Massey Ferguson 4363.1 – Engine Control Unit (ECU): Issue With The SCR Outlet Temperature Sensor (ECU)

The SCR catalyst outlet temperature value is not plausible. This indicates that while the sensor is providing a signal, the temperature reading does not make logical sense to the system based on the engine's current operating conditions.

• 4710
• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 4708
• 7726S
• 4707
• 4709
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5709
• 5710
• 5711
• 5712
• 5713
• 6711
• 6712
• 6713
• 6714
• 6715
• 6716
• 6718
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8600 Series
• 8700 Series

1. 1

   Use a diagnostic tool to monitor live data for the SCR catalyst outlet temperature. Compare it to the DOC and ambient temperatures when the tractor is completely cold (all should read roughly the same ambient temperature).

2. 2

   Inspect the wiring harness and connectors between the SCR outlet temperature sensor and the Engine ECU for chafing, corrosion, or loose pins that could cause high resistance.

3. 3

   Inspect the exhaust system upstream of the sensor for severe leaks that could introduce cool air or allow hot exhaust to escape, causing an artificially low reading.

1. 1

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical shorts.

   Ensure the machine is completely powered down before beginning work.

2. 2

   Locate the SCR outlet temperature sensor on the exhaust aftertreatment system.

   It will be positioned downstream of the SCR catalyst unit.

3. 3

   Carefully disconnect the electrical connector from the sensor harness.

4. 4

   Unscrew the faulty temperature sensor from the exhaust pipe.

   Use an appropriate wrench or sensor socket. Penetrating oil may be required if the sensor is seized from exhaust heat.

5. 5

   Apply a small amount of high-temperature anti-seize compound to the threads of the new sensor.

   Only apply if it does not come pre-applied. Ensure no compound gets on the sensor probe itself.

6. 6

   Thread the new sensor into the exhaust pipe by hand to prevent cross-threading, then tighten to the manufacturer's specified torque.

7. 7

   Reconnect the electrical connector, ensuring it clicks securely into place.

8. 8

   Reconnect the battery.

9. 9

   Connect a diagnostic tool, clear the inactive 004363.10 fault code, and run the engine.

   Monitor the live data to ensure the SCR outlet temperature rises plausibly as the exhaust system heats up.