What is SPN 625 & How to Solve It?

What is SPN 625

SPN 625: Refers to a fault related to the air intake temperature sensor, indicating that the temperature of the air entering the engine is out of range.

When SPN 625 is triggered, it means the ECM is receiving abnormal or incorrect air intake temperature data, which could affect the air-fuel mixture and combustion efficiency.

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Why It Happened

This fault code is caused by:

• A malfunctioning or failed air intake temperature sensor.
  
• Loose or damaged wiring between the sensor and ECM.
  
• Contamination or corrosion in the sensor or connectors.
  
• Environmental conditions affecting sensor readings.
  
  

How to Resolve It

To resolve SPN 625:

1. Inspect the air intake temperature sensor for faults or damage.
   
2. Check the wiring and connectors for any signs of wear or corrosion.
   
3. Replace the faulty sensor if necessary.
   
4. After repairs, clear the fault code and restart the engine to confirm the fix.
   
   

How to Avoid Before It Happens

To prevent SPN 625:

• Regularly inspect the air intake system and sensors.
  
• Ensure the air intake manifold is clean and free from debris.
  
• Use Clue to monitor intake air temperature data and receive early alerts for sensor issues.
• Set up regular construction equipment maintenance routines to reduce the risk of failure.