Infiniti QX4 (R50). Manual — part 221
6
CHECK IGNITION SPARK
1. Turn ignition switch “OFF”.
2. Disconnect ignition coil assembly from rocker cover.
3. Connect a known good spark plug to the ignition coil assembly.
4. Place end of spark plug against a suitable ground and crank engine.
5. Check for spark.
SEF575Q
OK or NG
OK
©
GO TO 7.
NG
©
Check ignition coil with power transistor and their circuit. Refer to EC-499.
7
CHECK INJECTOR
1. Turn ignition switch “OFF”.
2. Remove injector assembly.
Refer to EC-41.
Keep fuel hose and all injectors connected to injector gallery.
3. Disconnect all ignition coil harness connectors.
4. Turn ignition switch “ON”.
Make sure fuel does not drip from injector.
OK or NG
OK (Does not drip.)
©
GO TO 8.
NG (Drips.)
©
Replace the injector(s) from which fuel is dripping.
8
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
Trouble is fixed.
©
INSPECTION END
Trouble is not fixed.
©
Replace warm-up three way catalyst.
GI
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PD
AX
SU
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ST
RS
BT
HA
SC
EL
IDX
DTC P0420 (RIGHT BANK, -B1), P0430 (LEFT BANK, -B2) THREE WAY
CATALYST FUNCTION
Diagnostic Procedure (Cont’d)
EC-351
On Board Diagnosis Logic
NBEC0218
NOTE:
If DTC P0440 is displayed with P1448, perform trouble diagno-
sis for DTC P1448 first. (See EC-573.)
This diagnosis detects leaks in the EVAP purge line using engine
intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the
line between the fuel tank and EVAP canister purge volume con-
trol solenoid 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 volume control
solenoid valve. The EVAP canister vent control valve will then be
closed to shut the EVAP purge line off. The EVAP canister purge
volume control solenoid valve is opened to depressurize the EVAP
purge line using intake manifold vacuum. After this occurs, the
EVAP canister purge volume control solenoid valve will be closed.
SEF373Z
Malfunction is detected when EVAP control system has a leak,
EVAP control system does not operate properly.
CAUTION:
I
Use only a genuine NISSAN fuel filler cap as a replace-
ment. 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.
Possible Cause
NBEC0510
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 volume control solenoid 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
DTC P0440 EVAP CONTROL SYSTEM (SMALL LEAK) (NEGATIVE PRESSURE)
On Board Diagnosis Logic
EC-352
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 volume control solenoid valve and the
circuit
I
Absolute pressure sensor
I
Fuel tank temperature sensor
I
O-ring of EVAP canister vent control valve is missing or dam-
aged.
I
Water separator
I
EVAP canister is saturated with water.
I
EVAP control system pressure sensor
I
Fuel level sensor and the circuit
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IDX
DTC P0440 EVAP CONTROL SYSTEM (SMALL LEAK) (NEGATIVE PRESSURE)
Possible Cause (Cont’d)
EC-353
SEF565X
DTC Confirmation Procedure
NBEC0219
SEF566X
SEF874X
SEF567X
NOTE:
I
If DTC P0440 or P1440 is displayed with P1448, perform
trouble diagnosis for DTC P1448 first. (See EC-573.)
I
If
“DTC
Confirmation
Procedure”
has
been
previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
TESTING CONDITION:
I
Perform “DTC WORK SUPPORT” when the fuel level is
between 1/4 to 3/4 full and vehicle is placed on flat level
surface.
I
Open engine hood before conducting the following proce-
dure.
WITH CONSULT-II
NBEC0219S01
1)
Turn ignition switch “ON”.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
4)
Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70°C (32 - 158°F)
INT/A TEMP SE: 0 - 30°C (32 - 86°F)
5)
Select “EVAP SML LEAK P0440/P1440” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-
II.
Follow the instruction displayed.
NOTE:
If the engine speed cannot be maintained within the range dis-
played on the CONSULT-II screen, go to “Basic Inspection”,
EC-101.
6)
Make sure that “OK” is displayed.
If “NG” is displayed, refer to “Diagnostic Procedure”, EC-355.
NOTE:
Make sure that EVAP hoses are connected to EVAP canister
purge volume control solenoid valve properly.
WITH GST
NBEC0219S02
NOTE:
Be sure to read the explanation of “Driving Pattern” on EC-66
before driving vehicle.
1)
Start engine.
2)
Drive vehicle according to “Driving Pattern”, EC-66.
3)
Stop vehicle.
4)
Select “MODE 1” with GST.
I
If SRT of EVAP system is not set yet, go to the following step.
I
If SRT of EVAP system is set, the result will be OK.
5)
Turn ignition switch “OFF” and wait at least 10 seconds.
6)
Start engine.
It is not necessary to cool engine down before driving.
7)
Drive vehicle again according to the “Driving Pattern”, EC-66.
8)
Stop vehicle.
9)
Select “MODE 3” with GST.
I
If P0440 or P1440 is displayed on the screen, go to “Diagnos-
tic Procedure”, EC-355.
I
If P1447 is displayed on the screen, go to “Diagnostic Proce-
dure” for DTC P1447, EC-564.
DTC P0440 EVAP CONTROL SYSTEM (SMALL LEAK) (NEGATIVE PRESSURE)
DTC Confirmation Procedure
EC-354
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