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 - 5.5 V
  
  Fig 1: Inspecting Power Source Voltage Of Vapor Pressure Sensor
  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 fuel hose from the vapor pressure sensor.
3. Connect a voltmeter to terminals PTNK and E2 of the ECM, and measure the output voltage under the following 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 fuel hose to the vapor pressure sensor.
Fig 2: Inspecting Power Output Of Vapor Pressure Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002