What is SPN 521050 FMI 31 & How to Solve It?

What is SPN 521050 FMI 31:

SPN 521050 FMI 31 indicates a high voltage condition in the Fuel Injector Control Circuit. This fault code refers to an issue with the voltage supplied to the fuel injector control module, which can affect fuel injection accuracy and engine performance.

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Why This Happens:

• Faulty fuel injector control module (FICM).
  
• Damaged or shorted wiring in the control circuit.
  
• Corroded or loose connectors in the fuel injector control circuit.
  
• Power supply issues affecting the FICM.
  
• ECM failure to interpret the FICM signal.
  
  

How to Fix It:

1. Inspect the fuel injector control module and wiring for visible damage.
   
2. Test the FICM’s voltage and resistance to ensure proper operation.
   
3. Check connectors for tightness and cleanliness.
   
4. Replace the faulty FICM if it is malfunctioning.
   
5. Inspect the power supply to the FICM to ensure proper voltage.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel injector control module and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Maintain proper power supply to the FICM to prevent high voltage conditions.
  
• Perform routine diagnostic checks to ensure the FICM is functioning properly.
  
• Clue’s Fuel Management services help monitor injector control systems and ensure proper fuel injection operation.