What is SPN 3216 FMI 3 & How to Solve It?

What is SPN 3216 FMI 3:

SPN 3216 FMI 3 refers to a high voltage condition in the Fuel Temperature Sensor Circuit. FMI 3 indicates that the signal from the fuel temperature sensor is higher than expected, which can affect fuel system control and lead to engine performance problems.

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Why This Happens:

• Faulty fuel temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• High voltage supply affecting sensor output.
  
• Loose or corroded sensor connectors.
  
• ECM misinterpreting the sensor’s signal.
  
  

How to Fix It:

1. Inspect the fuel temperature sensor for damage or malfunction.
   
2. Test the sensor’s voltage and resistance to verify it is within the expected range.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Ensure proper voltage supply to the sensor.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel temperature sensor and wiring.
  
• Perform routine fuel system maintenance to avoid temperature-related issues.
  
• Keep connectors clean and free from corrosion.
  
• Use diagnostic tools to monitor sensor health.
  
• Clue’s Fuel Management services help monitor fuel temperature sensors to detect and prevent issues before they affect engine performance.