What is FMI 3 & How to Solve It?

What is FMI 3:

FMI 3 refers to signal above normal or shorted to high voltage. The ECM detects that the signal from the sensor is too high, which could indicate a fault in the sensor, wiring, or the system that is sending an unusually high voltage signal.

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Why This Happens:

• Faulty sensor sending incorrect data.
  
• Shorted or damaged wiring leading to high voltage.
  
• Power supply issues affecting sensor functionality.
  
• Corrosion or poor connection in the wiring circuit.
  
  

How to Fix It:

1. Inspect the sensor for damage or malfunction.
   
2. Check wiring and connectors for visible damage or signs of short circuits.
   
3. Test the sensor output to ensure it matches the expected values.
   
4. Replace the faulty sensor or damaged wiring if necessary.
   
5. Perform a diagnostic reset and verify the issue is resolved.
   
   

How to Avoid It Before It Happens:

• Regularly test sensor outputs during routine maintenance.
  
• Monitor voltage levels and inspect the wiring for any signs of wear or damage.
  
• Ensure a stable power supply to the sensor.
  
• Clue’s equipment maintenance services monitor signal levels and proactively detect issues before they lead to failures.