What is SPN 102 FMI 10 CUMMINS & How to Solve It?

What is SPN 102 FMI 10 CUMMINS:

SPN 102 FMI 10 CUMMINS indicates a problem with the Engine Coolant Temperature Sensor 1 on Cummins engines. FMI 10 means that the sensor is reporting a voltage that is out of range (either too high or too low), which can lead to incorrect coolant temperature readings. This affects the engine’s ability to properly regulate coolant flow, potentially leading to overheating or poor engine performance.

‍

Why This Happens

• Faulty or failing coolant temperature sensor.
  
• Damaged or shorted wiring in the sensor circuit.
  
• Corroded or loose sensor connectors.
  
• ECM misinterpreting the sensor’s signal due to electrical issues.
  
• Low coolant levels or air in the cooling system.
  
  

How to Fix It

1. Inspect the coolant temperature sensor and wiring for visible damage or corrosion.
   
2. Test the sensor’s voltage and resistance values to ensure they match manufacturer specifications.
   
3. Check the sensor connector for tightness and clean it of any debris or moisture.
   
4. Replace the coolant temperature sensor if it is malfunctioning or providing inaccurate readings.
   
5. Verify coolant levels and perform a system bleed if necessary.
   
   

How to Avoid It Before It Happens

• Regularly check and maintain proper coolant levels.
  
• Inspect the coolant temperature sensor and wiring during routine maintenance.
  
• Ensure connectors are clean, dry, and securely connected.
  
• Monitor coolant temperature readings through diagnostics to detect early signs of failure.
  

Clue offers preventive maintenance services to monitor coolant temperature and sensor health, ensuring early detection of issues before they affect engine performance.