What is SPN 4360 FMI 31 & How to Solve It?

What is SPN 4360 FMI 31:

SPN 4360 FMI 31 indicates a high voltage condition in the Fuel Injection Control Module (FICM) circuit. FMI 31 means that the voltage is above the expected level, which could affect the fuel injection system and result in poor engine performance or even damage to fuel injectors.

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Why This Happens:

• Faulty fuel injection control module (FICM).
  
• Damaged wiring in the FICM circuit.
  
• Short circuit or power supply issues affecting the voltage.
  
• Loose or corroded FICM connectors.
  
• ECM misinterpreting the FICM signal due to communication failure.
  
  

How to Fix It:

1. Inspect the FICM for any visible damage or malfunction.
   
2. Check the wiring and connectors in the FICM circuit for damage or corrosion.
   
3. Test the voltage supply to the FICM to ensure it is stable and within specification.
   
4. Replace the faulty FICM if it is malfunctioning.
   
5. Perform a diagnostic check to ensure proper ECM communication with the FICM.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the FICM circuit and wiring for damage.
  
• Ensure stable voltage supply to the FICM.
  
• Maintain clean and corrosion-free connectors.
  
• Perform routine diagnostic checks on FICM performance.
  
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