What is SPN 95 FMI 15 & How to Solve It?

What is SPN 95 FMI 15:

SPN 95 FMI 15 indicates a fault with the Fuel Temperature Sensor Circuit – Voltage Intermittent. This means the engine control module (ECM) is detecting inconsistent or intermittent voltage signals from the fuel temperature sensor, which monitors fuel temperature to optimize combustion and emissions.

Why This Happens

Common causes include:

• Faulty or failing fuel temperature sensor.
  
• Loose or corroded wiring/connectors.
  
• Intermittent wiring connection issues.
  
• Faulty ECM or sensor calibration problems.
  
  

How to Fix It

To resolve this fault:

1. Inspect the fuel temperature sensor and wiring for damage or corrosion.
   
2. Check connectors for secure fit and clean any corrosion.
   
3. Test the sensor for consistent voltage output and replace if faulty.
   
4. Repair or replace damaged wiring or connectors.
   
5. Clear the fault code and monitor sensor signals.
   
   

How to Avoid It Before It Happens

Prevent this fault by:

• Regularly inspecting the fuel temperature sensor and wiring.
  
• Ensuring secure and clean electrical connections.
  
• Performing routine diagnostics to detect intermittent signals early.
• Use Clue’s Preventive Maintenance to schedule regular inspections of the fuel temperature sensor and wiring to ensure proper connections and early detection of potential issues.