2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

EVAP Control System Pressure Sensor

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.

    Always replace O-ring with a new one. 

  2. Install a vacuum pump to EVAP control system pressure sensor.
  3. Turn ignition switch ON and check output voltage between ECM terminal 32 and ground under the following conditions.
    APPLIED VACUUM KPA (MMHG, INHG) AND VOLTAGE V

    Applied vacuum kPa (mmHg, inHg) Voltage V
    Not applied 1.8 - 4.8
    -26.7 (-200, -7.87) 2.1 to 2.5V lower than above value
    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). 
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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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