John Deere ECU004766.16 – ECU: Exhaust Filter Temperature Higher Than Expected / DOC Outlet Temperature Moderately High

The Engine Control Unit (ECU) has detected that the Diesel Oxidation Catalyst (DOC) outlet temperature is moderately high, exceeding expected levels. This indicates an issue within the aftertreatment system or engine operation causing unusually high exhaust temperatures. As a result, active exhaust filter cleaning becomes unavailable. Continued operation without addressing this condition may lead to reduced engine power and potential damage to aftertreatment components.

• PowerTech 4.5L
• PowerTech 6.8L
• PWX
• PVX
• PSX
• 4045 PowerTech
• 8310RT
• 8335RT
• 8360RT
• 9470RT
• 9520RT
• 9570RT
• 6090MC
• 6090RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 210L Loaders
• 4045HT

1. 1

   Check for other active fault codes related to fuel pressure, intake air temperature, or EGR, which could indicate an underlying issue causing the high exhaust temperature

2. 2

   Review operator practices to ensure avoidance of unnecessary idling, which can lead to soot buildup

3. 3

   Verify the use of correct ultra-low sulfur diesel fuel and recommended engine oil to prevent contamination

4. 4

   Inspect the air intake system for a clogged or restricted engine air filter

5. 5

   Inspect the cooling system for debris obstructing airflow to the radiator and charge air cooler

6. 6

   Inspect the exhaust system for physical blockages or damage to the exhaust piping and aftertreatment components

1. 1

   Reduce engine load

   If the high exhaust temperature indicator is active, immediately reduce engine speed and load to allow the system to cool down.

2. 2

   Perform parked regeneration

   If the system indicates a high level of soot accumulation, perform a parked exhaust filter cleaning (regeneration) following the operator's manual instructions.

3. 3

   Clean intake and cooling systems

   Thoroughly clean the air intake and cooling systems to remove any restrictions or debris identified during diagnostic checks.

4. 4

   Inspect sensor and wiring

   Visually inspect the DOC outlet temperature sensor and its wiring harness for any signs of damage, corrosion, or loose connections.

5. 5

   Test and replace temperature sensor

   If the issue persists, test the DOC outlet temperature sensor's resistance and voltage output against technical manual specifications. If the sensor is out of specification, replace it.