What is SPN 51 FMI 2 & How to Solve It?

What is SPN 51 FMI 2:

SPN 51 FMI 2 refers to a low voltage condition in the Oil Pressure Sensor Circuit. FMI 2 indicates that the signal from the oil pressure sensor is lower than expected, which can lead to inaccurate oil pressure readings, resulting in engine lubrication issues or poor performance.

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Why This Happens:

• Faulty oil pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Low oil pressure due to a malfunctioning oil pump.
  
• ECM misinterpretation of the sensor’s data.
  
  

How to Fix It:

1. Inspect the oil pressure sensor and its wiring for damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it meets specifications.
   
3. Check connectors for corrosion or loose connections.
   
4. Replace the faulty sensor if necessary.
   
5. Verify that the oil system is functioning correctly and maintaining proper pressure.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the oil pressure sensor and wiring.
  
• Perform regular oil system maintenance to ensure proper function.
  
• Keep connectors clean and free from corrosion.
  
• Perform routine diagnostic checks on oil pressure readings.
  
• Clue’s Equipment Maintenance services track oil system performance and help prevent issues from affecting engine lubrication.