Vapor Pressure Sensor: Inspection

INSPECT POWER SOURCE VOLTAGE OF VAPOR PRESSURE SENSOR
1. Disconnect the vapor pressure sensor connector.
2. Turn the ignition switch ON.
3. Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.
  Voltage: 4.5-5.5V
  
  Fig 1: Measuring Voltage Between Connector Terminals VC And E2 Of Wiring Harness Side
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Turn the ignition switch OFF.
5. Reconnect the vapor pressure sensor connector.
INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR
1. Turn the ignition switch ON.
2. Disconnect the vacuum hose from the vapor pressure sensor.
3. Connect a voltmeter to terminals PTNK and E2 of the ECM, and measure the output voltage under these conditions:
  1. Apply vacuum (2.0 kPa (15 mmHg, 0.59 in.Hg)) to the vapor pressure sensor.
    Voltage: 1.3-2.1 V
  2. Release the vacuum from the vapor pressure sensor.
    Voltage: 3.0-3.6 V
  3. Apply pressure (1.5 kPa (15 gf/cm² , 0.22 psi)) to the vapor pressure sensor.
    Voltage: 4.2-4.8 V
4. Turn the ignition switch OFF.
5. Reconnect the vacuum hose to the vapor pressure sensor.