What is MID 133 & How to Solve It?

What is MID 133:

MID 133 refers to a problem with the Engine Coolant Temperature Sensor Circuit. This fault is triggered when the ECM receives an invalid or out-of-range signal from the coolant temperature sensor, which can lead to improper engine temperature readings and overheating.

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Why This Happens:

• Faulty coolant temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Low coolant levels causing inaccurate readings.
  
• ECM failure to process the sensor’s signal properly.
  
  

How to Fix It:

1. Inspect the coolant temperature sensor for physical damage or malfunction.
   
2. Test the sensor’s voltage and resistance to verify it’s working correctly.
   
3. Check wiring and connectors for damage, corrosion, or loose connections.
   
4. Replace the faulty sensor if necessary.
   
5. Ensure that the coolant system is functioning and coolant levels are appropriate.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the coolant temperature sensor and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Maintain proper coolant levels and monitor the cooling system.
  
• Perform routine diagnostic checks to ensure the accuracy of sensor readings.
  
• Clue’s Equipment Maintenance services ensure the coolant system operates optimally and sensors are functioning properly.