What is SPN 97 FMI 15:
SPN 97 FMI 15 indicates a high voltage condition in the Engine Coolant Temperature Sensor Circuit. FMI 15 means that the ECM is receiving a higher-than-expected voltage signal from the coolant temperature sensor, which can cause incorrect readings, leading to engine mismanagement or overheating.
Why This Happens:
- Faulty coolant temperature sensor.
- High voltage supply to the sensor.
- Shorted or damaged wiring in the sensor circuit.
- Loose or corroded connectors in the sensor circuit.
- ECM failure to process the sensor’s signal.
How to Fix It:
- Inspect the coolant temperature sensor for visible damage or malfunction.
- Test the sensor’s voltage and resistance to verify that it is within specifications.
- Check the wiring and connectors for visible damage or corrosion.
- Replace the faulty coolant temperature sensor if necessary.
- Ensure that the ECM is correctly interpreting the sensor data.
How to Avoid It Before It Happens:
- Regularly inspect the coolant temperature sensor and wiring.
- Keep connectors clean and free from corrosion.
- Maintain proper coolant levels and monitor coolant temperature during routine diagnostics.
- Perform diagnostic checks to monitor sensor accuracy.
- Clue’s Equipment Maintenance services ensure proper coolant temperature monitoring to prevent mismanagement before it impacts engine operation.
