What is SPN 522 FMI 7
- SPN 522: Refers to a fault related to the exhaust gas temperature (EGT) sensor, indicating that the sensor is failing to provide a valid temperature reading.
- FMI 7: Indicates that the sensor has failed or is providing data that the ECM cannot process, typically due to a malfunction or poor signal quality.
Together, SPN 522 FMI 7 signals an issue with the EGT sensor, which could affect exhaust emissions and engine performance.
Why It Happened
This fault code is typically caused by:
- A malfunctioning EGT sensor.
- Wiring issues between the sensor and ECM, such as loose or corroded connections.
- Contamination or corrosion in the sensor or connectors.
- A failure in the exhaust system affecting the sensor’s performance.
How to Resolve It
To resolve SPN 522 FMI 7:
- Inspect the EGT sensor and replace if necessary.
- Check the wiring and connectors for any damage, corrosion, or loose connections.
- Inspect the exhaust system for any issues that could affect sensor readings.
- Clear the fault code and restart the engine to confirm the fix.
How to Avoid Before It Happens
To prevent SPN 522 FMI 7:
- Regularly inspect the EGT sensor and exhaust system.
- Keep the exhaust system clean and free from contamination.
- Use Clue to monitor exhaust gas temperature data and receive alerts on irregular readings.
