What is SPN 520216 FMI 31 & How to Solve It?

What is SPN 520216 FMI 31:

SPN 520216 FMI 31 refers to a high voltage issue in the Fuel Pressure Sensor Circuit. FMI 31 indicates that the voltage is higher than expected, which could affect the fuel pressure sensor’s performance, leading to issues with fuel injection and overall engine efficiency.

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Why This Happens:

• Faulty fuel pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded connectors.
  
• High voltage supply affecting the sensor.
  
• ECM failure to interpret the signal correctly.
  
  

How to Fix It:

1. Inspect the fuel pressure sensor for damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it is within specifications.
   
3. Check the wiring and connectors for damage or corrosion.
   
4. Replace the faulty fuel pressure sensor if necessary.
   
5. Ensure proper voltage supply to the sensor.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel pressure sensor and wiring.
  
• Maintain stable voltage supply to the sensor.
  
• Keep connectors clean and free from corrosion.
  
• Perform diagnostic checks on sensor performance regularly.
  
• Clue’s Fuel Management services offer proactive monitoring to prevent fuel pressure sensor malfunctions.