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voltages and air flow sensor

Discussion in 'Electronic Basics' started by species8350, Oct 21, 2005.

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  1. species8350

    species8350 Guest

    I have an air flow sensor on my car.

    Does it follow that if all the input and output voltages are correct,
    then the circuit must be fault free??

  2. John Fields

    John Fields Guest

  3. Jasen Betts

    Jasen Betts Guest

    no. only that it appears to be behaving correctly,

    it may still have a fault that only minifests itself intermittently -
    eg caused by temperature/humidity/vibration/air pressure etc...

  4. redls1bird

    redls1bird Guest

    an airflow sensor, or more commonly called a Mass air flow senso
    works by heating an element to a predetermed temprature, an
    maintaning that temp. the more airflow across the sensor, the mor
    power needed to maintain that temp. a more accurate way to test i
    by using a scan tool that has real time measurments available. mos
    manufactures have specific qauntities that should be consumed (i
    grams per second usually) at idle and wide open throttle in
    specific gear. its much easier with a tool than trying to measur
    these things with a voltmeter while the car is in motion. a low tec
    approach is, if you suspect the mass air flow sensor to be causing
    driveability issue (usually extremely sluggish, or excessive fue
    consumption) unplug the sensor and drive it that way. the car
    computer will have a preset guidlines to follow based on informatio
    from the map sensor, and throttle position sensor. if your proble
    is less evident like this, than most likely the sensor is faulty
  5. steamer

    steamer Guest

    --This is the same thing as a "hot pipe anemometer", yes?
  6. John Fields

    John Fields Guest

  7. Guest

    If this is one of the sensors on an automobile engine there are books
    out chiltons or haynes...that will give you directions for
    testing the sensor....public libraries usually keep chiltons books and
    the haynes books are usually found in auto parts stores.
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