3.2L Porsche Airflow Sensor

  I serviced a customer's airflow sensor.
Most sliding airflow sensors have serious scratches. And that scratch will worsen the linearity of the output voltage.
It also had a similar scratch, but the customer had already dealt with it by shifting the position of the resistor plate.
My job is to adjust the vane torque and check the output value.
  I checked the relationship between vane angle and torque. It was a little excessive, so I adjusted the position of the spring.
Theoretically, the relationship between air flow and vane angle should be examined. But it requires extensive equipment. I'm working on that device with a large vacuum cleaner, but it's not finished yet.
  The relationship between the output voltage and vane angle was measured by supplying a stabilized 5 V DC to the power supply terminal.



  The measurement results were acceptable.
It looks like there's a problem at 0 and 90 degrees, but that's because it's at the end.
If the air flow sensor has deteriorated, it is around 0.9V from 2.5V in output voltage to actually drive and feel a sense of discomfort. The majority of scratches are also concentrated in this area.