Toyota 22204-07010 Meter Sub-Assy, Intake Air Flow

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The Mass Airflow (MAF) sensor is mounted on the intake duct and consists of the hot wire of platinum, the thermo resistor, and the control circuit placed within the body of the plastic. It uses hot wire sensing element to measure molecular weight of air for intake into the engine. With the release of throttle more volume of air passes over the hot wire, and hence it cools down. The MAF sensor circuiting is worked in such a manner to maintain hot wire preset at specific temperature by regulating the flow of current through the element. Therefore, as the wire cools down, the PCM raises the current in endeavors to retain higher temperatures, and this leads to a fluctuating output voltage signal that the PCM records. The above signal is in the form of an analog waveform which is then converted to a digital waveform required in fuel injector pulse width modulation and controlling the injectors. If there is a failure in MAF sensor circuit an an indication as a check code will appear. When starting diagnosis, the ignition key should be in the OFF position, and then, remove the electrical connector from MAF sensor and pay attention to two mounting screws and connector. Subsequently pull out the MAF sensor after loosening two retaining bolts and then take out the O-ring from the air intake duct. Reassembly is basically the reverse of disassembly, but a new O-ring is fitted in-between the MAF sensor and the intake duct.

The Mass Airflow (MAF) sensor is located on the air intake duct. Its function is to measure the molecular mass (weight) of air entering the engine using a hot wire sensing element.

The output voltage signal of the MAF sensor varies in accordance with the current flow and is measured by the PCM, which converts this signal into a digital waveform, compares it to the map, calculates the requisite fuel injector pulse width (duration), and turns the injectors on and off accordingly.

Remove the mounting screws from the TPS and then remove the TPS from the throttle body.

Several checks can be performed, but if the driveability symptoms are intermittent or varied, it will be necessary to monitor the operation of the sensor(s) with a SCAN tool.