Scion 22204-22010 Meter Sub-Assy, Intake Air Flow

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The MAF sensor is located on the air filter housing with a platinum hot wire, thermistor and control circuit inside a plastic housing. This sensor makes use of a sensing element (hot-wire) to check the molecular mass (weight) of intake air into the engine. As the throttle opens, more air passes over the hot wire, thereby cooling it down. The function of this MAF sensor circuit is to retain the hot wire at one unaltered preset temperature by managing how current flows through it. As it cools down, PCM augments current through this hot wire in order to maintain its temperature at that particular degree. The voltage signal output from the MAF sensor fluctuates depending on this flow of current. This signal is then converted into digital waveform by PCM that calculates fuel injector pulse width (duration), turns injectors on and off correspondingly. Any trouble in such sensor circuit will activate diagnostic trouble code. Assure key ignition is OFF; remove electrical connector from MAF sensor; take out two screws holding sensor-take off both O-ring plus MAF sensors from housing air filter; fit new O-ring before reinserting them and reverse installation process.

Installation is the reverse of removal.

A problem in the MAF sensor circuit will set a diagnostic trouble code.

For reinstallation, follow the reverse of the removal process. Make sure to use a new O-ring to ensure proper sealing of the MAF sensor in the air filter housing.

The MAF sensor is located on the air filter housing, directly above the throttle body.

As the throttle opens, an increasing volume of air passes over the hot wire, which cools the wire. The MAF sensor circuit is designed to maintain the hot wire at a constant preset temperature by controlling the current flow through it.

Make sure the ignition key is in the Off position.

Simply follow the reverse steps of the removal process.

No, the mounting hardware is sold separately

This part is 100% new