Infiniti Q45 (FY33). Manual — part 192
SEF099P
DIAGNOSTIC PROCEDURE
SEF575Q
SEF415U
INSPECTION START
CHECK EXHAUST SYSTEM.
Visually check exhaust tubes and muffler
for dent.
OK
E
NG
Repair or replace it.
CHECK FOR EXHAUST AIR LEAK.
Start engine and run it at idle. Listen for an
exhaust air leak before the three way cata-
lyst.
OK
E
NG
Repair or replace.
CHECK FOR INTAKE AIR LEAK.
Start engine and run it at idle. Listen for an
intake air leak after the mass air flow sen-
sor.
OK
E
NG
Repair or replace.
Check for ignition timing.
Refer to “Basic inspection”, EC-91.
OK
E
NG
Adjust ignition timing.
CHECK IGNITION SPARK.
1. Disconnect ignition coil assembly from
rocker cover.
2. Connect a known-good spark plug to
the ignition coil assembly.
3. Place end of spark plug against a suit-
able ground and crank engine.
4. Check for spark.
OK
E
NG
Check ignition coil with
power transistor and their
circuits. Refer to EC-399.
CHECK INJECTORS.
1. Refer to WIRING DIAGRAM for
Injectors, EC-515.
2. Stop engine and then turn ignition
switch “ON”.
3. Check voltage between ECM terminals
q
1
,
q
2
,
q
3
,
q
5
,
q
6
,
q
7
,
q
8
,
q
14
and
ground with CONSULT-II or tester.
Battery voltage should exist.
4. Turn ignition switch “OFF”.
OK
E
NG
Perform TROUBLE DIAG-
NOSIS FOR NON-DE-
TECTABLE ITEMS,
“Injectors”, EC-515.
Repair harness or connec-
tors.
Remove injector assembly.
Refer to EC-38.
Keep fuel hose and all injectors connected
to injector gallery.
1. Turn ignition switch “OFF”.
2. Disconnect camshaft position sensor
harness connector.
3. Turn ignition switch “ON”.
Make sure fuel does not drip from injec-
tor.
Does not drip.
E
Drips
Replace the injectors from
which fuel is dripping.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
Trouble is fixed.
E
Trouble is not fixed.
Replace three way catalyst.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0420 (B1), P0430 (B2)
Three Way Catalyst Function (P0420: Left
bank), (P0430: Right bank) (Cont’d)
H
H
H
H
H
H
H
H
H
H
EC-297
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure)
Note: If DTC P1448 is displayed with P0440, perform TROUBLE DIAGNOSIS FOR DTC P1448 first. (See
ON BOARD DIAGNOSIS LOGIC
This diagnosis detects leaks in the EVAP purge line using of engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP can-
ister purge control valve, under the following “Vacuum test” conditions.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister
purge control valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off.
The EVAP canister purge volume control valve and EVAP canister purge control valve are opened to depres-
surize the EVAP purge line using intake manifold vacuum. After this occurs, the EVAP canister purge volume
control valve and EVAP canister purge control valve will be closed.
SEF850U
Diagnostic
Trouble Code
No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0440
0705
I
EVAP control system has a leak.
I
EVAP control system does not operate properly.
I
Incorrect fuel tank vacuum relief valve
I
Incorrect fuel filler cap used
I
Fuel filler cap remains open or fails to close.
I
Foreign matter caught in fuel filler cap.
I
Leak is in line between intake manifold and EVAP
canister purge control valve.
I
Foreign matter caught in EVAP canister vent control
valve.
I
EVAP canister or fuel tank leaks
I
EVAP purge line (pipe and rubber tube) leaks
I
EVAP purge line rubber tube bent.
I
Blocked or bent rubber tube to EVAP control system
pressure sensor
I
Loose or disconnected rubber tube
I
EVAP canister vent control valve and the circuit
I
EVAP canister purge control valve
I
EVAP canister purge volume control valve and the
circuit
I
EVAP canister purge control solenoid valve
I
Absolute pressure sensor
I
Fuel tank temperature sensor
I
MAP/BARO switch solenoid valve and the circuit
I
Blocked or bent rubber tube to MAP/BARO switch
solenoid valve
I
O-ring of EVAP canister vent control valve is missing
or damaged.
I
Water separator
I
EVAP canister is saturated with water.
I
EVAP control system pressure sensor
I
Refueling control valve
I
ORVR system leaks
CAUTION:
I
Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.
I
If the fuel filler cap is not tightened properly, the MIL may come on.
I
Use only a genuine NISSAN rubber tube as a replacement.
TROUBLE DIAGNOSIS FOR DTC P0440
EC-298
SEC048C
PEF669U
PEF929V
PEF297U
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
I
If DTC P1448 is displayed with P0440, perform TROUBLE
DIAGNOSIS FOR DTC P1448 first. (See EC-464.)
I
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PRO-
CEDURE” has been previously conducted, always turn
ignition switch “OFF” and wait at least 5 seconds before
conducting the next test.
TESTING CONDITION:
I
Perform “DTC WORK SUPPORT” when the fuel level is
less than 3/4 full and vehicle is placed on the flat level
surface.
I
It is better that fuel level is low.
I
Always perform test at a temperature of 0 to 30°C (32 to
86°F).
I
Battery voltage is more than 11V at idle.
1) Turn ignition switch “ON”.
2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON” and select “DATA MONITOR”
mode with CONSULT-II.
4) Check that the following conditions are met.
COOLAN TEMP/S: 0 - 70°C (32 - 158°F)
INT/A TEMP SE: 0 - 60°C (32 - 140°F)
5) Select “EVAP SML LEAK P0440” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-II.
Follow the instruction displayed.
NOTE:
I
If the CONSULT-II screen shown at left is displayed,
stop the engine and stabilize the vehicle tempera-
ture at 25°C (77°F) or cooler. After “FUEL T/TMP SE”
becomes less than 30°C (86°F), retest.
(Use a fan to reduce the stabilization time.)
6) Make sure that “OK” is displayed.
If
“NG”
is
displayed,
refer
to
“DIAGNOSTIC
PROCEDURE”, EC-301.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NOTE:
I
Be sure to read the explanation of “Driving pattern” on
EC-56 before driving vehicle.
I
It is better that the fuel level is low.
I
Always perform test at a temperature of 0 to 30°C (32 to
86°F).
1) Start engine (TCS switch “OFF”).
2) Drive vehicle according to “Driving pattern”, EC-56.
3) Stop vehicle.
4) Select “MODE 1” with GST.
I
If SRT of EVAP system is not set yet, go to the follow-
ing step.
I
If SRT of EVAP system is set, the result will be OK.
5) Turn ignition switch “OFF” and wait at least 5 seconds.
6) Start engine.
It is not necessary to cool engine down before the driv-
ing.
7) Drive vehicle again according to the “Driving pattern”,
8) Stop vehicle.
GI
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LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-299
9) Select “MODE 3” with GST.
I
If P1447 is displayed on the screen, go to “TROUBLE
DIAGNOSIS FOR DTC P1447”, EC-457.
I
If P0440 is displayed on the screen, go to “DIAGNOS-
TIC PROCEDURE”, EC-301.
I
If P1440 is displayed on the screen, go to “TROUBLE
DIAGNOSIS FOR DTC P1440”, EC-432.
I
If P0440 and P1440 are not displayed on the screen, go
to the following step.
10) Select “MODE 1” with GST.
I
If SRT of EVAP system is set, the result will be OK.
I
If SRT of EVAP system is not set, go to step 6).
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NOTE:
I
Be sure to read the explanation of “Driving pattern” on
EC-56 before driving vehicle.
I
It is better that the fuel level is low.
I
Always perform test at a temperature of 0 to 30°C (32 to
86°F).
1) Start engine (TCS switch “OFF”).
2) Drive vehicle according to “Driving pattern”, EC-56.
3) Stop vehicle.
4) Turn ignition switch “OFF” and wait at least 5 seconds.
5) Turn ignition switch “ON” and perform “Diagnostic Test
Mode (Self-diagnostic results)” with ECM.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-301.
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-300
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