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914 TCU Shows high airbox temp.

in 912 / 914 Technical Questions 7 years ago
So I plugged in my TCU to my laptop to calibrate the TPS. While I had the program, I noticed the air box temp was reading 25C. My garage is pretty cool at this time of year so I grabbed a laser thermometer and read 17C on the temperature of the airbox. And just to clear up, the engine has not been running at all. 8C seems like a pretty wide discrepancy considering the waste gate will start open at high temperatures.

Is there anyway to calibrate these sensors? Is it accurate at the higher temperatures and the lower temps don't matter? Am I over thinking this?

  • Re: 914 TCU Shows high airbox temp.

    by » 7 years ago

    There is no way to calibrate the airbox temperature sensor. Those sensors are spec'd to DIN EN 60751 which means that their response is basically linear throughout their entire operating range, and maximum acceptable tolerance is just under +/- 1.0 degrees C from 0 to 100 C.

    So, if your temperature measurement is accurate, then the sensor reading being 8 degrees higher than reality is definitely out of spec.

    But do keep in mind that the sensor is measuring INSIDE the airbox, and your laser is probably reading the OUTSIDE, right?

    Is your laser thermometer professionally calibrated, with accuracy to 1.0 degrees C??

    You probably would want to remove the sensor from the airbox, to test it properly...
    Thank you said by: Rob Seaton
      
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  • Re: 914 TCU Shows high airbox temp.

    by » 7 years ago

    Also, keep in mind that these are RESISTANCE thermometers, so their reading can be severely affected by bad wiring issues - make sure that all connector contacts are clean and free of oxidation, and that connectors are firmly attached....
      
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  • Re: 914 TCU Shows high airbox temp.

    by » 7 years ago

    Thanks, I actually had the thought to clean the connectors etc.

    It’s definitely reading high. I’ll post again if I can get it back down by cleaning up the contacts with out getting a new sensor.
      
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  • Re: 914 TCU Shows high airbox temp.

    by » 7 years ago

    So I turned on my Master and observed the temperature was the SAME as the ambient but then it started to slowly rise over a 5 minute period until it read 8C high. Is it’s own resistance heating up the probe?
      
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