LS 430 V8-4.3L (3UZ-FE) (2002)
Leak Detection Sensor: Testing and Inspection
VAPOR PRESSURE SENSOR
INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF VAPOR PRESSURE SENSOR
a. Disconnect the vapor pressure sensor connector.
b. Turn the ignition switch ON.
c. Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.
Voltage: 4.5 - 5.5 V
d. Turn the ignition switch OFF.
e. Reconnect the vapor pressure sensor connector.
2. INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR
a. Turn the ignition switch ON.
b. Disconnect the fuel hose from the vapor pressure sensor.
c. Connect a voltmeter to terminals VPTK and EPTK 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/sq.cm, 0.22 psi)) to the vapor pressure sensor.
Voltage: 4.2 - 4.8 V
d. Turn the ignition switch OFF.