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SEF434Q SEF462U SEF463U SEF200U SEF598U DIAGNOSTIC PROCEDURE INSPECTION START CHECK FUEL FILLER CAP. 1. Turn ignition switch “OFF”. 2. Check for genuine NISSAN fuel filler cap design. 3. Check for air releasing sound while opening the fuel filler cap. If the air releasing sound is heard, go to . If the air releasing sound is not heard, check the following. Was the cap tightened properly? If Yes, check fuel filler cap vacuum relief valve. Refer to “EVAPORATIVE EMISSION SYSTEM”, EC-27. If No, open fuel filler cap, then clean cap and filler neck thread using air blower. Retighten until ratcheting sound is heard. OK E NG If genuine NISSAN fuel filler cap is not used, replace with NISSAN fuel filler cap. CHECK FOR EVAP LEAK. I Never use compressed air or a high pressure pump. I Improper installation of adapter to the service port may cause a leak. I Do not exceed 4.12 kPa (0.042 kg/cm 2 , 0.6 psi) of pressure in the system. To locate the EVAP leak, do the follow- ing. 1. Install the EVAP service port adapter and the pressure pump securely. 2. Turn ignition switch “ON”. Select “EVAP SYSTEM CLOSE” of “WORK SUP- PORT” mode with CONSULT- II. 3. Touch “START” and apply pressure to the EVAP line until the pressure indicator reaches the middle of the bar graph. 4. Using EVAP leak detector, locate the leak. Refer to the instruction manual for more details about the leak detec- tor. Refer to “Evaporative Emis- sion Line Drawing”, EC-29. -------------------------------------------------------------------------------------------------------------------------------------- OR -------------------------------------------------------------------------------------------------------------------------------------- 2. Turn ignition switch “OFF”. 3. Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts until the end of test.) 4. Apply 12 volts DC to vacuum cut valve bypass valve. The valve will open. (Continue to apply 12V until the end of test.) 5. 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 service port adapter. 6. Locate the leak using a leak detector. Refer to the instruction manual for more details about the leak detector. Refer to “Evaporative Emission Line Drawing”, EC-29. OK E NG Repair or replace. q A (Go to next page.) GI MA EM LC FE AT PD FA RA BR ST RS BT HA EL IDX TROUBLE DIAGNOSIS FOR DTC P0440 Evaporative Emission (EVAP) Control System H H H EC-301 |