What is SPN 52105 FMI 31 & How to Solve It?

What is SPN 52105 FMI 31:

SPN 52105 FMI 31 indicates a high voltage condition in the Fuel Injector Control Circuit. This fault suggests that the ECM is receiving an unexpectedly high voltage signal from the fuel injector control module, which can lead to fuel injector malfunctions and performance issues.

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Why This Happens:

• Faulty fuel injector control module (FICM).
  
• Shorted or damaged wiring in the injector control circuit.
  
• High voltage supply to the FICM.
  
• Corroded or loose connectors in the injector control circuit.
  
• ECM misinterpreting the signal from the FICM.
  
  

How to Fix It:

1. Inspect the FICM and wiring for visible damage or malfunction.
   
2. Test the voltage and resistance in the injector control circuit.
   
3. Check connectors for corrosion or loose connections.
   
4. Replace the faulty FICM if it’s malfunctioning.
   
5. Verify stable voltage supply to the FICM.

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How to Avoid It Before It Happens:

• Regularly inspect the fuel injector control module and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Ensure proper voltage supply to the FICM and monitor for fluctuations.
  
• Perform diagnostic checks to monitor injector control system performance.
  
• Clue’s Fuel Management services help track injector control circuits to prevent performance issues before they affect engine operation.