What is FMI 4 & How to Solve It?

What is FMI 4:

FMI 4 refers to out of range signal. The ECM detects that the sensor’s signal is outside the expected range, which can lead to incorrect readings and improper system functioning.

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Why This Happens:

• Sensor malfunctioning or faulty.
  
• Wiring issues affecting signal transmission.
  
• Corroded connectors or loose wiring.
  
• System performance affected by environmental factors (e.g., temperature).
  
  

How to Fix It:

1. Inspect the sensor for damage or malfunction.
   
2. Test the sensor output to ensure it is within the correct range.
   
3. Check wiring and connectors for any visible damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Perform system diagnostics to ensure the sensor is correctly calibrated.
   
   

How to Avoid It Before It Happens:

• Regularly inspect sensors and wiring for wear or damage.
  
• Perform system recalibration as part of routine maintenance.
  
• Ensure connectors are properly secured and free from corrosion.
  
• Clue’s equipment maintenance services ensure sensors and systems are regularly calibrated to prevent misreading and faults.