What is SPN 1347 FMI 3:
SPN 1347 FMI 3 refers to an issue with the Exhaust Gas Temperature Sensor. FMI 3 indicates that the sensor is not functioning within the expected range, potentially causing incorrect exhaust temperature readings, which could affect the exhaust after-treatment system and engine performance.
Why This Happens:
- Faulty exhaust gas temperature sensor.
- Damaged or shorted wiring in the sensor circuit.
- Loose or corroded sensor connectors.
- Malfunctioning exhaust after-treatment system.
- ECM misinterpreting the sensor’s signal.
How to Fix It:
- Inspect the exhaust gas temperature sensor for any visible damage or wear.
- Test the sensor’s signal and ensure it is within the manufacturer’s specified range.
- Check the wiring and connectors for damage or corrosion.
- Replace the faulty sensor if necessary.
- Inspect the exhaust system for blockage or malfunction.
How to Avoid It Before It Happens:
- Regularly inspect the exhaust gas temperature sensor and its wiring.
- Keep connectors clean and free from debris or corrosion.
- Ensure the exhaust system is functioning properly and free from obstruction.
- Use diagnostic tools to monitor exhaust system performance.
- Clue’s Equipment Maintenance services monitor exhaust systems and sensors to help prevent issues before they affect engine operation.
