New Holland 3170 – ECU: DPF Exhaust Temperature Exceeds 700 Degrees

The Engine Control Unit (ECU) has detected that the exhaust temperature in the Diesel Particulate Filter (DPF) is higher than 700 degrees Celsius. This condition may indicate an improperly functioning DPF regeneration process, a faulty temperature sensor, or issues within the fuel and exhaust systems. If left unaddressed, this excessive temperature can lead to damage or reduced efficiency of the after-treatment system.

• T4
• T5
• TD5
• T4.55
• T4.65
• T4.75
• T4.85
• T4.95
• T4.105
• T4.115
• TD5.115
• Workmaster 60
• Workmaster 70
• Farmall 55C
• Farmall 65C
• Farmall 75C
• Farmall 85C
• Farmall 95C
• Farmall 105C
• Farmall 115C
• PowerStar T4.55
• PowerStar T4.65
• PowerStar T4.75
• CX Series Combines
• CR Series Combines
• Compact Track Loaders
• Skid Steer Loaders

1. 1

   Verify the active fault code 3170 using a diagnostic scanner

2. 2

   Check for other related fault codes concerning DPF pressure sensors, other temperature sensors, or the Selective Catalytic Reduction (SCR) system

3. 3

   Review machine operation with the operator for recent performance issues, unusual noises, or extended idling periods

4. 4

   Monitor DPF temperature sensors via live data with a cold engine; readings should match ambient temperature. Erratic readings (e.g., -40°C or fixed high) indicate a faulty sensor

5. 5

   Perform a resistance test on the DPF temperature sensor by disconnecting it, measuring resistance with a multimeter, and applying heat with a heat gun to verify resistance changes

6. 6

   Visually inspect the DPF housing and connecting pipes for cracks, leaks, or damage

7. 7

   Inspect the hoses leading to the DPF differential pressure sensor for cracks, blockages, or leaks (a smoke tester can be useful)

8. 8

   Test the DPF differential pressure sensor by monitoring live data while applying pressure with a hand-held pump to ensure readings increase accordingly

9. 9

   Inspect the air filter for clogs and the fuel system for leaks, clogged filters, or contaminated fuel

10. 10

    Perform a forced regeneration using a diagnostic tool in a safe environment to burn off accumulated soot if all sensors and components appear to be functioning correctly

1. 1

   Replace faulty sensors

   If a DPF temperature sensor or the DPF differential pressure sensor is identified as faulty, it should be replaced.

2. 2

   Repair leaks

   If any leaks are found in the exhaust system or the DPF pressure sensor hoses, they must be repaired.

3. 3

   Clean or replace DPF

   If a forced regeneration does not clear the fault and the DPF is determined to be clogged, it may need to be removed for professional cleaning or replacement.

4. 4

   Address underlying issues

   If the DPF is clogging repeatedly, there may be an underlying engine issue (e.g., faulty injectors, incorrect fuel injection timing, or turbocharger problems) that needs to be addressed.