Vapor Pressure Sensor: Inspection

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

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 terminal 1 and 3 of the wiring harness side.
  1. Voltage: 4.5 - 5.5 V
  Fig 1: Measuring Voltage Between Connector Terminal 1 & 3
  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. Remove the fuel tank cap.
3. Connect a voltmeter to terminal 2 and 3, and measure the output voltage.
  
  Fig 2: Measuring Output Voltage Between Terminal 2 & 3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Voltage: 3.0 - 3.6 V
4. Reinstall the fuel tank cap.
5. Turn the ignition switch OFF.