What is SPN 6802 FMI 31 & How to Solve It?

What is SPN 6802 FMI 31:

SPN 6802 FMI 31 refers to a communication error with the Fuel Injector Control Module (FICM). FMI 31 indicates a high voltage condition, where the ECM receives a voltage that is above the expected level, which may prevent the FICM from properly controlling fuel injection.

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Why This Happens:

• Faulty FICM.
  
• Short or open wiring in the FICM circuit.
  
• Corroded or loose connectors in the FICM wiring.
  
• Power supply issues affecting the FICM voltage.
  
• ECM failure to properly interpret the signal from the FICM.
  
  

How to Fix It:

1. Inspect the FICM for visible damage or malfunction.
   
2. Check the wiring and connectors for signs of corrosion or damage.
   
3. Test the voltage supply to the FICM and ensure it is within specifications.
   
4. Replace the faulty FICM if necessary.
   
5. Verify the ECM is properly receiving and interpreting data from the FICM.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the FICM wiring and connectors.
  
• Keep the FICM and connectors clean and free from corrosion.
  
• Maintain stable voltage supply to the FICM.
  
• Perform regular diagnostic checks on the FICM and ECM.
  
• Clue’s Equipment Maintenance services help monitor FICM performance, ensuring that fuel injectors are functioning optimally.