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.
  1. Voltage: 4.5 - 5.5 V
4. Turn the ignition switch OFF.
5. Reconnect the vapor pressure sensor connector.
  
  Fig 1: Inspecting Power Source Voltage Of Vapor Pressure Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR
1. Turn the ignition switch ON.
  
  Fig 2: Inspecting Power Output Of Vapor Pressure Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
    1. Voltage: 1.3 - 2.1 V
  2. Release the vacuum from the vapor pressure sensor.
    1. Voltage: 3.0 - 3.6 V
  3. Apply pressure (1.5 kPa (15 gf/cm² , 0.22 psi)) to the vapor pressure sensor.
    1. Voltage: 4.2 - 4.8 V
4. Turn the ignition switch OFF.
5. Reconnect the vacuum hose to the vapor pressure sensor.