John Deere ECU004766.18 – ECU: Cleaning System Fault

The Engine Control Unit (ECU) has detected a fault preventing the exhaust filter cleaning process (regeneration) from continuing. This is often caused by the Diesel Oxidation Catalyst (DOC) outlet temperature being moderately low, meaning it cannot reach the necessary temperature to burn off trapped soot in the Diesel Particulate Filter (DPF). If unresolved, this will lead to soot accumulation, engine derate, and potential loss of machine availability.

• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 8R Series
• 8245R
• 8400R
• 9RT Series
• 9470RT
• 9520RT
• 9570RT
• 4.5L PowerTech
• 6.8L PowerTech

1. 1

   Review operator best practices: ensure use of Ultra Low Sulfur Diesel (ULSD) and low-ash engine oil, and avoid prolonged idling.

2. 2

   Verify that the automatic exhaust filter cleaning mode is enabled in the machine's settings (e.g., via the CommandCenter display).

3. 3

   Check the diagnostic display for other active fault codes related to temperature or pressure sensors in the aftertreatment system.

4. 4

   Attempt to initiate a parked (manual) regeneration. Park in a well-ventilated area, ensure fuel is not critically low, place transmission in Park/Neutral, disengage PTO, set to low idle, and initiate via the engine menu.

1. 1

   Connect diagnostic tool

   Connect John Deere Service ADVISOR to read detailed fault information and monitor system parameters.

2. 2

   Inspect exhaust system

   Visually inspect the entire exhaust aftertreatment system, including the DOC and DPF, for any signs of physical damage, cracks, or leaks.

3. 3

   Test DOC outlet temperature sensor

   Locate the sensor on the exhaust piping after the DOC. Inspect wiring and connectors for damage or corrosion. Monitor temperature readings for plausibility compared to other sensors (DOC inlet, DPF inlet/outlet). Test sensor resistance according to technical manual specifications if wiring is intact.

4. 4

   Inspect fuel dosing system

   Inspect the fuel dosing injector for blockages or damage. Check fuel lines running to the doser for leaks or restrictions. Inspect and test the fuel dosing temperature and pressure sensor.

5. 5

   Check other exhaust sensors

   Inspect and test the DOC inlet temperature sensor and the DPF pressure differential sensor to ensure they are not preventing regeneration.

6. 6

   Service DPF

   If all sensors and dosing systems function correctly, the DPF may be excessively clogged with ash (which cannot be burned off). Remove the DPF for professional cleaning or replacement.