How To Detect Fuel Vapor Leakage

With CONSULT-II 

1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump and hose to the EVAP service port adapter.
3. Turn ignition switch ON.
4. Select the EVAP SYSTEM CLOSE of WORK SUPPORT MODE with CONSULT-II.
5. Touch START. A bar graph (Pressure indicating display) will appear on the screen.
   Fig 2: Displaying CONSULT-II EVAP SYSTEM CLOSE Screen

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
   Fig 3: Displaying CONSULT-II EVAP SYSTEM CLOSE Screen

   Courtesy of NISSAN MOTOR CO., U.S.A.
7. Remove EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to EVAPORATIVE EMISSION LINE DRAWING  .

Without CONSULT-II 

1. Attach the EVAP service port adapter securely to the EVAP service port. See Figure .
2. Also attach the pressure pump with pressure gauge to the EVAP service port adapter.
3. Apply battery voltage to between the terminals of both EVAP canister vent control valve and vacuum cut valve bypass valve to make a closed EVAP system.
   Fig 4: Applying Voltage Between EVAP Canister Vent Control Valve And Vacuum Cut Valve Bypass Valve

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm² , 0.2 to 0.4 psi).
5. Remove EVAP service port adapter and hose with pressure pump.
6. Locate the leak using a leak detector. Refer to EVAPORATIVE EMISSION LINE DRAWING  .