Diagnostic Procedure

CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF.
2. Check for genuine NISSAN fuel filler cap design.
OK or NG
1. OK: GO TO 2.
2. NG: Replace with genuine NISSAN fuel filler cap.
  
  Fig 1: Identifying Genuine NISSAN Fuel Filler Cap Design
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise.

OK or NG
1. OK: GO TO 3.
2. NG:
  1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
  2. Retighten until ratcheting sound is heard.
CHECK FUEL FILLER CAP FUNCTION
Check for air releasing sound while opening the fuel filler cap.

OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
CHECK FUEL TANK VACUUM RELIEF VALVE
1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum.
  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)
  
  Fig 2: Identifying Fuel Tank Vacuum Relief Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
  
  Fig 3: Checking Valve Opening Pressure And Vacuum
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace fuel filler cap with a genuine one.
INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. For the location of EVAP service port, refer to EVAPORATIVE EMISSION LINE DRAWING .

NOTE: Improper installation of the EVAP service port adapter to the EVAP service port may cause leaking.

Fig 4: Identifying EVAP Service Port
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Installing EVAP Service Port Adapter And Pressure Pump To EVAP Service Port
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Models with CONSULT-II: GO TO 6.
2. Models without CONSULT-II: GO TO 7.
CHECK FOR EVAP LEAK
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 6: CONSULT-II Display EVAP System Close
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the for more details. Refer to EVAPORATIVE EMISSION LINE DRAWING .
OK or NG
1. OK: GO TO 8.
2. NG: Repair or replace.
  
  Fig 7: Identifying EVAP Leak Detector
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FOR EVAP LEAK
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. 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.
  Fig 8: Identifying EVAP Canister Vent Control Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Using EVAP leak detector, locate the EVAP leak. Refer to EVAPORATIVE EMISSION LINE DRAWING .
OK or NG
1. OK: GO TO 8.
2. NG: Repair or replace.
  
  Fig 9: Identifying EVAP Leak Detector
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
- EVAP canister vent control valve is installed properly.
  Refer to REMOVAL AND INSTALLATION .
- EVAP canister vent control valve.
  Refer to COMPONENT INSPECTION .
OK or NG
1. OK: GO TO 10.
2. NG: Repair or replace EVAP canister vent control valve and O-ring.
CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Does water drain from the EVAP canister?
Yes or No
1. Yes: GO TO 10.
2. No (With CONSULT-II): GO TO 12.
3. No (Without CONSULT-II): GO TO 13.
  
  Fig 10: Identifying EVAP Canister Saturated With Water
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

The weight should be less than 1.9 kg (4.2 lb).

OK or NG
1. OK (With CONSULT-II): GO TO 12.
2. OK (Without CONSULT-II): GO TO 13.
3. NG: GO TO 11.
DETECT MALFUNCTIONING PART
Check the following.
- EVAP canister for damage
- EVAP hose connected to EVAP canister for clogging or poor connection
  1. Repair hose or replace EVAP canister.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
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%.
5. Check vacuum hose for vacuum when revving engine up to 2, 000 RPM.
  Vacuum should exist.
OK or NG
1. OK: GO TO 15.
2. NG: GO TO 14.
  
  Fig 11: CONSULT-II Display Active Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
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 16.
2. NG: GO TO 14.
CHECK VACUUM HOSE
Check vacuum hoses for clogging or disconnection. Refer to EVAPORATIVE EMISSION LINE DRAWING .

OK or NG
1. OK: GO TO 15.
2. NG: Repair or reconnect the hose.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 16.
2. NG: Replace EVAP canister purge volume control solenoid valve.
CHECK FUEL TANK TEMPERATURE SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 17.
2. NG: Replace fuel level sensor unit.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 18.
2. NG: Replace EVAP control system pressure sensor.
CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection. Refer to EVAPORATIVE EMISSION SYSTEM .

OK or NG
1. OK: GO TO 19.
2. NG: Repair or reconnect the hose.
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
1. GO TO 20.
CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection. For location, refer to ON BOARD REFUELING VAPOR RECOVERY (ORVR) .

OK or NG
1. OK: GO TO 21.
2. NG: Repair or replace hoses and tubes.
CHECK SIGNAL LINE AND RECIRCULATION LINE
Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection.

OK or NG
1. OK: GO TO 22.
2. NG: Repair or replace hoses, tubes or filler neck tube.
CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 23.
2. NG: Replace refueling EVAP vapor cut valve with fuel tank.
CHECK FUEL LEVEL SENSOR
Refer to FUEL LEVEL SENSOR UNIT CHECK .

OK or NG
1. OK: GO TO 24.
2. NG: Replace fuel level sensor unit.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END