What is SPN 651 FMI 7:
SPN 651 FMI 7 refers to a fault in the Turbocharger Boost Pressure Sensor circuit. FMI 7 means that the sensor is sending an out-of-range signal, which can lead to incorrect boost pressure readings, causing poor engine performance and possibly damaging the turbocharger.
Why This Happens:
- Faulty turbocharger boost pressure sensor.
- Damaged or shorted wiring in the sensor circuit.
- Corroded or loose sensor connectors.
- Turbocharger malfunction.
- ECM misinterpretation of the sensor data.
How to Fix It:
- Inspect the turbocharger boost pressure sensor for damage or malfunction.
- Test the sensor’s voltage and resistance to ensure they meet specifications.
- Check the wiring and connectors for visible damage or corrosion.
- Replace the faulty sensor if it’s found to be defective.
- Verify the turbocharger is functioning properly and the air intake system is free of blockages.
How to Avoid It Before It Happens:
- Regularly inspect the turbocharger boost pressure sensor and wiring.
- Ensure proper turbocharger maintenance and clean air intake systems.
- Perform routine diagnostic checks to monitor sensor performance.
- Keep connectors clean and free from moisture.
- Clue’s Equipment Maintenance services monitor the health of your turbocharging system to prevent performance issues from sensor malfunctions.
