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.
2004 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
EVAP Control Pressure Sensor
- Remove EVAP control system pressure sensor with its harness connector connected.
- Remove hose from EVAP control system pressure sensor.
- Install a vacuum pump to EVAP control system pressure sensor.
- Turn ignition switch ON.
- Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure Figure.CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
- Check voltage between ECM terminal 110 and ground with CONSULT-II or tester. See Figure.CAUTION: Discard any EVAP control system pressure sensor which has dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such a concrete floor; use a new one.
- If NG, replace EVAP control system pressure sensor.
Factory Service Tools
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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.
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