Vapor Pressure Sensor (Tacoma)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure ignition is off. To test vapor pressure sensor supply voltage, obtain access to electrical connector at vapor pressure sensor. Vapor pressure sensor is located on top of fuel pump assembly on top of fuel tank and uses a Black 3-pin electrical connector. See Figure. It may be necessary to lower fuel tank for access to vapor pressure sensor. On models with rear seats, it may be possible to vapor pressure sensor by removing driver's side rear seat cushion and cover plate on floor panel.
- Disconnect electrical connector from vapor pressure sensor. Turn ignition on. Using voltmeter, measure vapor pressure sensor supply voltage between terminals VC and E2 on wiring harness side of electrical connector for vapor pressure sensor. See Fig 1. DO NOT use center terminal. Vapor pressure sensor supply voltage should be 4.5-5.5 volts.
- If vapor pressure sensor supply voltage is within specification, turn ignition off. Reinstall electrical connector on vapor pressure sensor. Go to next step. If vapor pressure sensor supply voltage is not within specification, check wiring circuit between Engine Control Module (ECM) and vapor pressure sensor. See WIRING DIAGRAMS article. ECM is located behind glove box. For illustration of ECM location, see THEORY & OPERATION article.
- To test vapor pressure sensor output voltage, turn ignition on. Remove fuel tank cap. Obtain access to Engine Control Module (ECM) located behind the glove box. For illustration of ECM location, see THEORY & OPERATION article. Using voltmeter, measure vapor pressure sensor output voltage between terminals PTNK (Red/Yellow wire) and E2 (Blue/Black wire) at ECM. See Fig 1.
- Vapor pressure sensor output voltage should be 3.0-3.6 volts. If voltage is not with specification, it may be necessary to check wiring circuit between ECM and vapor pressure sensor. See WIRING DIAGRAMS article. If wiring harness and electrical connectors are okay, it may be necessary to replace vapor pressure sensor. See VAPOR PRESSURE SENSOR under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Turn ignition off. Reinstall fuel tank cap.