Genuine Mazda Millenia Air Temperature Sensor

Mazda Millenia Air Temperature Sensor Parts and Q&A

• Air Temperature Sensor
  BP4W-18-845
  Q: How does the intake air temperature sensor function and how can it be tested and replaced on Mazda Millenia?

  A:

  The intake air temperature sensor is treated as a variable resistor, which changes its resistance depending on the temperature, and the computer is able to measure this change and hence detect the temperature of incoming air. This data is essential in modifying the air/fuel ratio and ignition timing parameters. To check sensor, across its two terminals, an ohmmeter is connected; readings of infinite resistance is a defective sensor. In vehicles which have a plate or cone-shaped type mass air flow meter, the sensor is built into the meter. Start the testing with disconnecting the negative battery cable and the sensor connector. Next, attachment of the ohmmeter between the sensor terminals and measurement of the resistance, and comparison with values 29.7-36.3 kohms at 77 °F (25 °C ) and 3.3-3.7 ohms at 185 °C. In case of discrepancy between the readings and the specifications then, the sensor has to be replaced. To remove, unscrew the negative battery cable and remove the sensor by removing it out of the air cleaner housing or air intake. When changing a sensor, make sure to put in a new sealing washer to the thermosensor.