What is SPN 520349 & How to Solve It?

What is SPN 520349:

SPN 520349 refers to an issue with the Fuel Temperature Sensor Circuit. This fault occurs when the ECM detects an abnormal signal from the sensor, affecting the fuel management system and potentially causing engine inefficiency or poor fuel delivery.

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Why This Happens:

• Faulty fuel temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Low voltage supply affecting sensor readings.
  
• ECM failure to interpret the sensor’s data correctly.
  
  

How to Fix It:

1. Inspect the fuel temperature sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it meets specifications.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty fuel temperature sensor if necessary.
   
5. Ensure the fuel system is functioning properly and free from contamination.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel temperature sensor and wiring.
  
• Keep connectors clean and free from moisture.
  
• Perform routine diagnostic checks on fuel system performance.
  
• Monitor fuel temperature sensor health with diagnostic tools.
  
• Clue’s Fuel Management services offer real-time monitoring of fuel temperature and help prevent malfunctions before they affect engine performance.