Vapor Pressure Sensor: Inspection

REMOVE LUGGAGE COMPARTMENT BOX
REMOVE FLOOR SERVICE HOLE COVER
REMOVE VAPOR PRESSURE SENSOR
1. Remove the 2 bolts and No. 3 fuel tank protector.
2. Disconnect the vapor pressure sensor connector.
3. Remove the clip and vapor pressure sensor.
INSPECT VAPOR PRESSURE SENSOR
1. Turn the ignition switch ON.
2. Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.
  Voltage: 4.5 - 5.5 V
3. Turn the ignition switch OFF.
Fig 1: Measuring Voltage Between Connector Terminals VC And E2 Using A Voltmeter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR
1. Connect the vapor pressure sensor connector.
2. Turn the ignition switch ON.
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.
REINSTALL VAPOR PRESSURE SENSOR
1. Reinstall the vapor pressure sensor and clip.
2. Reconnect the vapor pressure sensor connector.
3. Reinstall the 2 bolts and No. 3 fuel tank protector.
REINSTALL FLOOR SERVICE HOLE COVER
REINSTALL LUGGAGE COMPARTMENT BOX

Fig 2: Measuring Output Voltage Between Terminals PTNK And E2 Of ECM Using A Voltmeter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002