Tacoma 4WD L4-164.4 2693cc 2.7L DOHC (3RZ-FE) (1996)
Vapor Pressure Sensor: Component Tests and General Diagnostics
1. INSPECT POWER SOURCE VOLTAGE OF VAPOR PRESSURE SENSOR.
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Disconnect the vapor pressure sensor connector.
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Turn the ignition switch ON.
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Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.
Voltage: 4.5 - 5.5 Volts
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Turn the ignition switch to LOCK.
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Reconnect the vapor pressure sensor connector.
2. INSPECT POWER OUTPUT OF VAPOR PRESSURE SENSOR.
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Turn the ignition switch ON.
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Disconnect the vacuum hose from the vapor pressure sensor.
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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 kgf/cm2, 0.22 psi) to the vapor pressure sensor.
Voltage: 4.2 - 4.8 V
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Reconnect the vacuum hose to the vapor pressure sensor.