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Vapor Pressure Sensor

  1. Turn ignition on. Using voltmeter, measure voltage between terminals VC and E2 on wiring harness side of ECM. See Fig 1. Power source voltage should be 4.5-5.5 volts.
  2. To test vapor pressure sensor output voltage, remove fuel tank cap. Connect voltmeter to terminals PTNK and E2 on wiring harness side of ECM and measure output voltage. See Fig 2. Voltage should be 3-3.6 volts. If not, repair or replace as necessary.
Fig 1: Inspecting Vapor Pressure Sensor Power Source Voltage
G00251294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Inspecting Vapor Pressure Sensor Power Output Voltage
G00251295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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