Air flow pressure sensor
1. The sensor is mounted on a bracket on the left side of the intake manifold.
2. A full sensor check is best done at a Toyota dealership, which has all the necessary equipment, but the following check will help determine whether the sensor is receiving the correct voltage.
3. Disconnect the wiring connector from the sensor.
4. Turn the ignition key to the ON position and measure the voltage between the terminals in the connector socket with a voltmeter; the voltage value should be 4.5-5.0 volts. If this is not the case, check ("ring") the wiring.
5. Connect the wiring connector.
(This material is taken from a resource: toyotaman.ru)