What is SPN 61683 FMI 16 & How to Solve It?

What is SPN 61683 FMI 16:

SPN 61683 FMI 16 indicates a fault with the Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit. FMI 16 specifically means that the sensor is reporting a high pressure differential, which could indicate a problem with the DPF system or the sensor itself. This sensor monitors the pressure before and after the DPF to determine when regeneration is needed. If the sensor is malfunctioning, it can lead to incorrect regeneration cycles and potential engine derate.

Why This Happens

• Faulty or failing DPF differential pressure sensor.
  
• Damaged or shorted wiring in the sensor circuit.
  
• Clogged or restricted DPF, causing abnormal pressure readings.
  
• Corroded or loose sensor connectors.
  
• ECM misinterpreting the sensor data.
  
  

How to Fix It

1. Inspect the DPF differential pressure sensor and wiring for visible damage or corrosion.
   
2. Test the sensor for correct voltage and resistance readings.
   
3. Check the DPF for excessive soot buildup or blockage and perform a cleaning if necessary.
   
4. Verify the sensor connector is tight and moisture-free.
   
5. Replace the differential pressure sensor if it is faulty or out of spec.
   
   

How to Avoid It Before It Happens

• Regularly clean and maintain the DPF to prevent soot buildup.
  
• Inspect the DPF differential pressure sensor and wiring during routine service.
  
• Ensure connectors are clean and secure to prevent poor connections.
  
• Replace the DPF sensor at recommended intervals.
  

Clue provides preventive maintenance services to monitor DPF sensor health and prevent future issues before they impact engine performance.