What is SPN 110 FMI 16:
SPN 110 FMI 16 refers to an issue with the Coolant Temperature Sensor Circuit. FMI 16 indicates that the sensor signal is below the expected voltage, which could cause the ECM to misinterpret engine coolant temperature, affecting engine performance and fuel efficiency.
Why This Happens:
- Faulty coolant temperature sensor.
- Damaged or shorted wiring in the sensor circuit.
- Poor connection or corrosion in the sensor connectors.
- Low coolant levels, preventing proper temperature sensing.
- ECM misinterpreting the sensor's data due to an internal error.
How to Fix It:
- Inspect the coolant temperature sensor for any physical damage or wear.
- Check the sensor wiring and connectors for corrosion, loose connections, or short circuits.
- Verify the voltage and resistance from the coolant temperature sensor and ensure it meets specification.
- Replace the sensor if it’s providing incorrect readings.
- Ensure the coolant levels are within the proper range and top off if necessary.
How to Avoid It Before It Happens:
- Regularly inspect the coolant system and temperature sensors.
- Keep connectors clean and ensure they are free from corrosion or moisture.
- Maintain proper coolant levels and replace coolant as recommended.
- Perform periodic diagnostic checks on sensor performance.
- Use Clue's Fleet Management services to monitor sensor health and maintain optimal coolant system performance.
