What is SPN 2791 FMI 2:
SPN 2791 FMI 2 indicates an issue with the Turbocharger Boost Pressure Sensor Circuit. FMI 2 typically refers to an abnormal signal coming from the turbo boost sensor, which could be due to low boost pressure or sensor malfunction, affecting engine performance and efficiency.
Why This Happens:
- Faulty turbocharger boost pressure sensor.
- Damaged or shorted wiring in the sensor circuit.
- Loose or corroded sensor connectors.
- Turbocharger failure or poor performance.
- ECM misinterpreting the sensor signal.
How to Fix It:
- Inspect the turbocharger boost pressure sensor for visible damage.
- Test the sensor’s voltage and resistance to ensure proper functionality.
- Check wiring and connectors for corrosion or loose connections.
- Replace the faulty sensor if it’s not functioning correctly.
- Inspect the turbocharger system for malfunction or failure.
How to Avoid It Before It Happens:
- Regularly inspect the turbocharger boost pressure sensor and wiring.
- Maintain the turbocharger system and perform necessary repairs.
- Check connectors for wear or corrosion.
- Perform regular diagnostic checks on turbo system performance.
- Clue’s Equipment Maintenance services help monitor turbo systems and sensors to prevent performance problems from sensor malfunctions.
