Leak Detection Sensor: Testing and Inspection

VAPOR PRESSURE SENSOR INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF VAPOR PRESSURE SENSOR.



- Disconnect the vapor pressure sensor connector.
- Turn the ignition switch ON.
- Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.

Voltage: 4.5 - 5.5 Volts

- Turn the ignition switch to LOCK.
- Reconnect the vapor pressure sensor connector.

2. INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR.
- Turn the ignition switch ON.



- Disconnect the vacuum hose from the vapor pressure sensor.



- Connect a voltmeter to terminals PTNK and E2 of the ECM, and measure the output voltage under the following conditions:
- Apply vacuum (2.0 kpa, 15 mm Hg, 0.59 in.Hg) to the vapor pressure sensor.

Voltage: 1.3 - 2.1 Volts

- Release the vacuum from the vapor pressure sensor.

Voltage: 2.9 - 3.7 Volts

- Apply pressure (1.5 kpa, 15 gf/cm2, 0.22 psi) to the vapor pressure sensor.

Voltage: 4.2 - 4.8 Volts

- Reconnect the vacuum hose to the vapor pressure sensor.