What is SPN 1243 FMI 14 & How to Solve It?

What is SPN 1243 FMI 14:

SPN 1243 FMI 14 refers to a problem with the Intake Air Temperature (IAT) Sensor. FMI 14 indicates that the ECM is receiving a low voltage condition from the IAT sensor, which can affect the air/fuel mixture and lead to reduced engine efficiency or poor acceleration.

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Why This Happens:

• Faulty intake air temperature sensor.
  
• Damaged or shorted wiring in the sensor circuit.
  
• Corroded or loose sensor connectors.
  
• Low or fluctuating voltage supply to the sensor.
  
• ECM misinterpretation of the sensor’s data.
  
  

How to Fix It:

1. Inspect the intake air temperature sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it is functioning properly.
   
3. Check the wiring and connectors for any signs of damage, corrosion, or loose connections.
   
4. Replace the faulty sensor if necessary.
   
5. Verify the air intake system is free from contamination or blockages.
   
   

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 system is clear and performs optimally.
  
• Perform routine checks using diagnostic tools to monitor sensor health.
  
• Clue’s Equipment Maintenance services help monitor intake air systems and prevent sensor-related issues before they affect engine operation.