Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Vapor Pressure Sensor
2004 Toyota Celica GT, StandardSECTION Vapor Pressure Sensor
WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.