Diagnostic Procedure

1. Turn ignition switch OFF
2. Check for genuine NISSAN fuel filler cap design. Figure

OK or NG 

1. OK: GO TO 2.
2. NG: Replace with genuine NISSAN fuel filler cap

Check that the cap is tightened properly by rotating the cap clockwise.

OK or NG 

1. OK: GO TO 3.
2. NG:
   • Open fuel filler cap, ten clean cap and fuel filler neck threads using air blower.
   • Retighten until ratcheting sound is heard.

Check for air releasing sound while opening the fuel filler cap.

OK or NG 

1. OK: GO TO 5.
2. NG: GO TO 4.

1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum. See Figure and Figure .

Pressure: 

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm ² , 2.22 - 2.90 psi) 

Vacuum: 

-6.0 to -3.3 kPa (-0.061 to -0.034 kg/cm ² , -0.87 to -0.48 psi) 

OK or NG 

1. OK: GO TO 5.
2. NG: Replace fuel filler cap with a genuine one.

To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. See Figure and Figure .

1. Models with CONSULT-II: GO TO 6.
2. Models with CONSULT-II: GO TO 7.

With CONSULT-II 

1. Turn ignition switch ON.
2. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II.
3. Touch START and apply pressure into the EVAP line until the pressure indicator reaches the middle of the bar graph.
   NOTE:

   • Never use compressed air or a high pressure pump.
   • Do not exceed 4.12 kPa (0.042 kg/cm² , 0.6 psi) of pressure in the system.
     Fig 1: Selecting EVAP SYSTEM CLOSE On WORK SUPPORT Mode (CONSULT-II)

     Courtesy of NISSAN MOTOR CO., U.S.A.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. See Figure . Refer to EVAPORATIVE EMISSION LINE DRAWING  .

OK or NG 

1. OK: GO TO 8.
2. NG: Repair or replace.

Without CONSULT-II 

1. Turn ignition switch OFF.
2. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts until the end of test.)
3. Apply 12 volts DC to vacuum cut valve bypass valve. The valve will open. (Continue to apply 12V until the end of test.)
   Fig 2: Apply 12 Volts DC To Vacuum Cut Valve Bypass Valve

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg), then remove pump and EVAP service port adapter.
   NOTE:

   • Never use compressed air or a high pressure pump.
   • Do not exceed 4.12 kPa (0.042 kg/cm² , 0.6 psi) of pressure in the system.
5. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details. See Figure . Refer to EVAPORATIVE EMISSION LINE DRAWING  .
   Fig 3: Identifying EVAP Leak Detector

   Courtesy of NISSAN MOTOR CO., U.S.A.

   OK or NG 

   1. OK: GO TO 8.
   2. NG: Repair or replace.

1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A  and C  are not clogged by blowing air into B  with A  , and then C  plugged.
Fig 4: Checking Water Separator
Courtesy of NISSAN MOTOR CO., U.S.A.
5. In case of NG in items 2 - 4, replace the parts.
   NOTE: Do not disassemble water separator.

   OK or NG 

   1. OK: GO TO 9.
   2. NG: GO TO Replace water separator.

Refer to DTC P1448 EVAP CANISTER VENT CONTROL VALVE  .

OK or NG 

1. OK: GO TO 10.
2. NG: Repair or replace EVAP canister vent control valve and O-ring or harness/connector.

1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Does water drain from the EVAP canister?
   Fig 5: Checking EVAP Canister Saturation

   Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No 

1. Yes: GO TO 11.
2. No (With CONSULT-II): GO TO 13.
3. No (Without CONSULT-II): GO TO 14.

Weigh the EVAP canister with the EVAP canister vent control valve attached.

The weight should be less than 1.8 kg (4.0 lb). 

OK or NG 

1. OK (With CONSULT-II): GO TO 13.
2. OK (Without CONSULT-II): GO TO 14.
3. NG: GO TO 12.

Check the following.

• EVAP canister for damage
• EVAP hose between EVAP canister and water separator for clogging or poor connection

1. : Repair hose or replace EVAP canister.

With CONSULT-II 

1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
2. Start engine.
3. Perform PURG VOL CONT/V in ACTIVE TEST mode.
4. Touch Qu on CONSULT-II screen to increase PURG VOL CONT/V opening to 100.0%.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm. See Figure .

Vacuum should exist. 

OK or NG 

1. OK: GO TO 16.
2. NG: GO TO 15.

Without CONSULT-II 

1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

Vacuum should exist. 

OK or NG 

1. OK: GO TO 17.
2. NG: GO TO 15.

Check vacuum hoses for clogging or disconnection. Refer to VACUUM HOSE DRAWING  .

OK or NG 

1. OK (With CONSULT-II): GO TO 16.
2. OK (Without CONSULT-II): GO TO 17.
3. NG: Repair or reconnect the hose.

With CONSULT-II 

1. Start engine.
2. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Check that engine speed varies according to the valve opening. See Figure .

OK or NG 

1. OK: GO TO 18.
2. NG: GO TO 17.

With CONSULT-II 

Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions. See Figure and Figure .

Without CONSULT-II 

Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions. See Figure and Figure .

OK or NG 

1. OK: GO TO 18.
2. NG: Replace EVAP canister purge volume control solenoid valve.

1. Remove fuel level sensor unit.
2. Check resistance between fuel level sensor unit and fuel pump terminals 4 and 5 by heating with hot water or heat gun as shown in Figure .

OK or NG 

1. OK: GO TO 19.
2. NG: Replace fuel level sensor unit.

1. Remove EVAP control system pressure sensor with its harness connector connected.
   CAUTION: Never apply force to the air hole protector of the sensor if equipped.