What is SPN 520197 FMI 31 & How to Solve It?

What is SPN 520197 FMI 31:

SPN 520197 FMI 31 refers to a communication error in the Fuel Injector Control Module (FICM). FMI 31 indicates that the ECM has detected a high voltage condition in the FICM circuit, which can affect the fuel injectors' operation and lead to poor engine performance or injector failure.

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Why This Happens:

• Faulty Fuel Injector Control Module (FICM).
  
• Shorted or damaged wiring in the FICM circuit.
  
• High voltage supply affecting the FICM.
  
• Corroded or loose connectors in the FICM circuit.
  
• ECM failure to correctly process data from the FICM.
  
  

How to Fix It:

1. Inspect the FICM for damage or malfunction.
   
2. Test the FICM voltage to ensure it’s within specifications.
   
3. Check wiring and connectors for corrosion or damage.
   
4. Replace the faulty FICM if necessary.
   
5. Ensure proper power supply to the FICM and verify ECM communication.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the FICM and wiring.
  
• Perform routine diagnostic checks to monitor FICM health.
  
• Keep connectors clean and ensure they are corrosion-free.
  
• Maintain stable voltage supply to the FICM.
  
• Clue’s Fuel Management services track FICM performance and help prevent injector-related issues before they affect engine efficiency.