What is SPN 1328 FMI 31
- SPN 1328: Refers to a fault in the exhaust gas recirculation (EGR) temperature sensor, which monitors the temperature of exhaust gases that are recirculated back into the engine. This sensor is critical for maintaining optimal combustion and controlling emissions.
- FMI 31: Indicates that the sensor has failed to provide valid data or is reporting a signal that is not within the expected range. This could mean the sensor has malfunctioned or there is an issue with the communication between the sensor and the ECM.
Together, SPN 1328 FMI 31 signals a malfunction in the EGR temperature sensor, which can cause the engine to run inefficiently and affect emission control.
Why It Happened
This fault is typically caused by:
- A failed or damaged EGR temperature sensor.
- Wiring issues such as corrosion or loose connections between the sensor and the ECM.
- A blocked or malfunctioning EGR valve that prevents the correct flow of exhaust gases.
- Excessive carbon buildup in the EGR system, affecting sensor readings.
- Contaminated or faulty ECM, which may fail to interpret the sensor data correctly.
How to Resolve It
To resolve SPN 1328 FMI 31:
- Inspect the EGR temperature sensor for damage and replace it if necessary.
- Check wiring and connections for any signs of damage, corrosion, or loose connections.
- Inspect the EGR valve and system for blockages or excessive carbon buildup. Clean the system if needed.
- Test the ECM to ensure it is properly processing data from the sensor.
- After repairs, clear the fault code and restart the engine to verify that the issue has been resolved.
How to Avoid Before It Happens
To prevent SPN 1328 FMI 31:
- Regularly clean and maintain the EGR system to prevent carbon buildup.
- Perform routine inspections of the EGR valve, temperature sensor, and wiring.
- Use Clue to monitor exhaust gas data and get early alerts when sensor readings are out of range.
