What is SPN 1070 FMI 10
- SPN 1070: Refers to a fault related to the engine coolant temperature sensor, which measures the temperature of the coolant and helps regulate engine cooling.
- FMI 10: Indicates that the sensor is reporting an invalid signal, or there is an issue with the communication between the sensor and ECM, often due to poor sensor performance or wiring problems.
When SPN 1070 FMI 10 is triggered, it suggests that the ECM is receiving an invalid or out-of-range coolant temperature signal, which could affect engine performance and cooling efficiency.
Why It Happened
This fault is commonly caused by:
- A malfunctioning coolant temperature sensor.
- Wiring issues such as poor connections, corrosion, or damaged wires.
- Coolant leaks or low coolant levels that affect the sensor's ability to read accurately.
- Faulty thermostat causing improper temperature regulation.
How to Resolve It
To resolve SPN 1070 FMI 10:
- Check coolant levels and ensure they are adequate.
- Inspect the coolant temperature sensor for faults and replace it if necessary.
- Check the wiring between the sensor and ECM for any damage or poor connections.
- Test the thermostat to ensure it is regulating coolant flow properly.
- After repairs, clear the fault code and restart the engine to confirm the issue is resolved.
How to Avoid Before It Happens
To prevent SPN 1070 FMI 10:
- Regularly check coolant levels and ensure the cooling system is free of leaks.
- Inspect the coolant temperature sensor and wiring periodically.
