What is SPN 1814 FMI 2 & How to Solve It?

What is SPN 1814 FMI 2:

SPN 1814 FMI 2 indicates a problem with the Intake Air Temperature Sensor Circuit. FMI 2 means that the sensor is sending an out-of-range voltage to the ECM, which can cause improper air/fuel mixture adjustments and lead to poor engine performance.

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Why This Happens:

• Faulty intake air temperature sensor.
  
• Damaged or shorted wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Air intake system contamination.
  
• ECM misinterpretation of sensor data.
  
  

How to Fix It:

1. Inspect the intake air temperature sensor for damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure proper operation.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Inspect the intake air system for contamination or obstruction.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the intake air temperature sensor and wiring.
  
• Keep connectors clean and free from debris or moisture.
  
• Ensure the intake air system is clear and functioning properly.
  
• Perform routine diagnostic checks on sensor performance.
  
• Clue offers Equipment Maintenance services to monitor intake air systems and prevent issues with temperature sensors.