What is SPN 411 FMI 2 & How to Solve It?

What is SPN 411 FMI 2:

SPN 411 FMI 2 indicates a high voltage condition in the Engine Oil Pressure Sensor on Cummins engines. The FMI 2 code specifically means that the sensor is reporting higher than expected voltage, which can lead to improper oil pressure readings. This could affect engine performance, fuel efficiency, and may lead to potential engine damage if not addressed.

Why This Happens

• Faulty or malfunctioning oil pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Corroded or loose sensor connectors.
  
• ECM misinterpreting the sensor data.
  
• High oil pressure due to an issue with the oil pump or a restriction in the oil lines.
  
  

How to Fix It

1. Inspect the oil pressure sensor and wiring for damage or corrosion.
   
2. Test the sensor’s voltage and resistance readings to verify if they match manufacturer specifications.
   
3. Check the oil pressure using a manual gauge to confirm if the sensor's reading is accurate.
   
4. Replace the oil pressure sensor if it is found to be faulty.
   
5. Inspect the oil pump and lines for blockages or malfunctions.
   
   

How to Avoid It Before It Happens

• Regularly check oil levels and replace oil filters as needed.
  
• Inspect the oil pressure sensor and wiring during routine maintenance.
  
• Ensure connectors are clean, dry, and properly sealed.
  
• Perform diagnostic checks on the oil pressure system to detect early signs of issues.
  

Use Clue's asset tracking to monitor oil pressure readings in real-time and address issues before they affect engine performance.