Sunday , 25 June 2017
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Checking Temp Sensor

Engine temperature is a crucial system that need serious attention onto it. Any mis-configuration or neglect on sustain it’s operating temperature can cause a major damage to your engine.

Temperature sensor tells you the temperature of you running engine via your dashboard gauge display. Prior starting the engine, not much movement on the gauge, but once it reach the working temp, the gauge will start moving towards the center. Way above the center marking of the gauge mean your engine temp is too high.

During initial starting the engine. The gauge showing no affect nor movement.
During initial starting the engine. The gauge showing no affect nor movement.
After 5 to 10 minutes prior to starting the engine, the gauge start to move towards the slightly center marking. This is your normal working engine temperature.
After 5 to 10 minutes prior to starting the engine, the gauge start to move towards the slightly center marking. This is your normal working engine temperature.
The gauge is showing way toward 'H' marks. This too hot.
The gauge is showing way toward ‘H’ marks. This too hot.

The overheating onto your engine can caused by a couple of factors such as blockage onto your radiator, low liquid cooling due to leakage, cooling fan not working, defect cylinder head causing the cooling liquid to evaporate inside combustion chamber, and sometime even the dumbest factor is the temp sensor sending you wrong reading that makes the whole driving experience a haywire.

The temperature sensor that being fitted onto your engine can vary depending on the manufacture. However it still remain more or less the same looks and structure as below image explain. It task is to send the reading of the temperature to your dash gauge.

Temperature Sensor
Temperature Sensor

 

A fella friends ask me previously how to check the sensor for the defect as changing to a new sensor cost him a huge buck. As to my understanding, the sensor is hardly to become unstable and rarely produce defect but still have the small window for error. Luckily for us, checking the temp sensor for defect can be done at your own garage with less cost before even changing to a new sensor.

Locate your temp sensor on your engine and take it out for checking. Clip the two terminals to your Multimeter OHM reading and start boil the water on your stove. The reading on the OHM meter should show zero reading while the water is still cold and will increase while the water temp start to arise. It it working, then the OHM meter should start increase gradually as to the water temp. Else, if no movement at all or the OHM meter spike to the end during initial warm-up, then the sensor is out already. Need to change.

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Just to add on the article, the temperature sensor also have it’s own resistance to heat ratio based on the setting by the manufacturers.

air_temp_sensor

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