What is SPN 3720 FMI 15 CUMMINS & How to Solve It?

What is SPN 3720 FMI 15 CUMMINS:

SPN 3720 FMI 15 in Cummins engines indicates a high voltage issue in the Turbocharger Boost Pressure Sensor Circuit. FMI 15 suggests that the sensor is sending a voltage higher than expected, which can lead to inaccurate boost pressure readings and affect engine performance.

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Why This Happens:

• Faulty turbocharger boost pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Corroded or loose connectors.
  
• High voltage supply affecting the sensor’s output.
  
• ECM misinterpreting the sensor signal.
  
  

How to Fix It:

1. Inspect the turbocharger boost pressure sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure proper operation.
   
3. Check the wiring and connectors for damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Inspect the turbocharger system for proper operation.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the turbocharger boost pressure sensor and wiring.
  
• Perform routine turbocharger maintenance to ensure optimal performance.
  
• Keep connectors clean and free from corrosion.
  
• Monitor turbo system performance with diagnostic tools.
  
• Clue’s Equipment Maintenance services track turbocharger health and provide early warnings for sensor-related issues.