What is SPN 100 FMI 18 & How to Solve It?

What is SPN 100 FMI 18:

SPN 100 FMI 18 indicates a low voltage condition in the Oil Pressure Sensor Circuit. This fault typically refers to a problem where the sensor is sending a low voltage signal to the ECM, potentially causing issues with oil pressure monitoring.

‍

Why This Happens:

• Faulty oil pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Corroded or loose sensor connectors.
  
• Low oil pressure due to insufficient oil levels or a malfunctioning pump.
  
• ECM failure to interpret the sensor signal correctly.

‍

How to Fix It:

1. Inspect the oil pressure sensor for damage or malfunction.
   
2. Check the sensor wiring and connectors for corrosion or damage.
   
3. Test the sensor’s voltage and resistance to ensure it is within specification.
   
4. Replace the faulty oil pressure sensor.
   
5. Verify oil pressure levels and ensure the oil pump is functioning correctly.

‍

How to Avoid It Before It Happens:

• Perform regular checks on the oil pressure sensor and wiring.
  
• Maintain proper oil levels and replace oil filters as necessary.
  
• Keep sensor connectors clean and ensure they are free from moisture and corrosion.
  
• Regularly inspect the oil system to ensure it’s functioning correctly.
  
• Clue offers Equipment Maintenance services to proactively monitor oil pressure sensors and prevent issues from affecting engine performance.