Vapor Pressure Sensor
- Ensure ignition is off. To test vapor pressure sensor supply voltage, disconnect electrical connector at vapor pressure sensor. Sensor is located on rear corner of charcoal canister and contains a Black 3-pin connector. See Figure.
- Turn ignition on. Using voltmeter, measure voltage between terminals VCC (Blue/Red wire) and E2 (Brown/White wire) on wiring harness side of electrical connector for vapor pressure sensor. Supply voltage should be 4.5-5.5 volts.
- If supply voltage is not within specification, check wiring circuit. See WIRING DIAGRAMS
article. If supply voltage is within specification, turn ignition off. Reinstall electrical connector on vapor pressure sensor.
- To test vapor pressure sensor output voltage, turn ignition on. Disconnect vacuum hose from vapor pressure sensor. See Fig 1.
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- Access Engine Control Module (ECM) behind glove box. Connect voltmeter between terminals E2 (Brown/White wire) and PTNK (Blue/Black wire) at ECM connector. See Fig 2.
- Using vacuum pump, apply .59 in. Hg of vacuum to vapor pressure sensor. Output voltage should be 1.3-2.1 volts. Release vacuum from vapor pressure sensor. Output voltage should be 3.0-3.6 volts. Apply .22 psi (.015 kg/cm2
) to vapor pressure sensor. Output voltage should be 4.2-4.8 volts. Replace vapor sensor if any output voltage is not as specified. Reconnect vacuum hose.
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