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Infiniti Q45 (FY33). Manual - part 200

SEF434Q

SEF419U

DIAGNOSTIC PROCEDURE

INSPECTION START

CHECK FUEL FILLER CAP.
1. Turn ignition switch “OFF”.
2. Check for genuine NISSAN fuel filler

cap design.
If NG, replace with genuine NISSAN
fuel filler cap.
If OK, go to next step.

3. Check that the cap is tightened properly

by rotating the cap clockwise.

Open fuel filler cap, then clean cap
and fuel filler neck threads using air
blower.

Retighten until ratcheting sound is
heard.
If OK, go to next step.

4. Check for air releasing sound while

opening the fuel filler cap.

Check fuel tank vacuum
relief valve. (Refer to
“FUEL TANK VACUUM
RELIEF VALVE”), EC-27.
If NG, replace with genuine
NISSAN fuel filler cap.
If OK, go to

“CHECK

FOR EVAP LEAK”.

CHECK COMPONENT.
Check EVAP purge line (pipe, rubber tube,
fuel tank and EVAP canister) for cracks or
improper connection or disconnection.
Refer to “EVAPORATIVE EMISSION
SYSTEM”, EC-29.

Repair or reconnect the
hose.

Check hoses between EVAP canister and
refueling control valve for disconnection.
For location, refer to “SYSTEM DESCRIP-
TION” in “On Board Refueling Vapor
Recovery (ORVR)” on EC-31.

Reconnect hoses properly.

CHECK COMPONENT AND CIRCUIT
(EVAP canister vent control valve, O-ring).
Refer to “TROUBLE DIAGNOSIS FOR
DTC P0446” for circuit, EC-315 and
“COMPONENT INSPECTION”, EC-332.

Repair or replace EVAP
canister vent control valve
and O-ring or harness/
connector.

(Go to next page.)

IDX

TROUBLE DIAGNOSIS FOR DTC P0455

Evaporative Emission (EVAP) Control System
(Gross Leak) (Cont’d)

EC-329

SEF462U

PEF658U

SEF200U

SEF598U

SEF599U

CHECK FOR EVAP LEAK.

Never use compressed air or high
pressure pump.

Improper installation of service port
may cause leaking.

Do not exceed 4.12 kPa (0.042 kg/cm

0.6 psi) of pressure in the system.

To locate EVAP leak portion, proceed with
the following steps.
1. Install the EVAP service port adapter

and the pressure pump securely.

2. Turn ignition switch “ON”.

Select “EVAP SYSTEM
CLOSE” of “WORK SUPPORT”
mode with CONSULT-II.

3. Touch “START” and apply

vacuum into the EVAP line until
the pressure indicator reaches
the middle of bar graph.

4. Using EVAP leak detector,

locate the leak portion. For the
leak detector, refer to instruction
manual for more details.
Refer to “Evaporative Emission
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 12 volts 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).

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.

Repair or replace.

(Go to next page.)

TROUBLE DIAGNOSIS FOR DTC P0455

Evaporative Emission (EVAP) Control System
(Gross Leak) (Cont’d)

EC-330

SEF765X

SEF597U

SEF396W

SEF394WA

CHECK COMPONENT

(EVAP canister purge control solenoid

valve).

1. Disconnect vacuum hose to

EVAP canister purge control sole-

noid valve.

2. Start engine.

3. Perform “PURG CONT S/V” in

“ACTIVE TEST” mode.

4. Select “ON” on CONSULT-II

screen to turn on “PURG CONT

S/V”.

5. Check vacuum hose for vacuum

when revving engine up to 2,000

rpm.

Vacuum should exist.

1. Start engine and warm it up to

normal operating temperature.

2. Stop engine.

3. Disconnect vacuum hose to

EVAP canister purge control sole-

noid valve.

4. Start engine and let it idle for at

least 60 seconds.

5. Check vacuum hose for vacuum

when revving engine up to 2,000

rpm.

Vacuum should exist.

Check the following.

EVAP canister purge con-

trol solenoid valve.

Refer to “COMPONENTS

INSPECTION”, EC-332 and

“P1492 EVAP canister

purge control solenoid

valve” for circuit, EC-305.

Vacuum hoses for clog-

ging or disconnection.

Refer to “Vacuum Hose

Drawing”, EC-31.

CHECK COMPONENT

(Absolute pressure sensor).