Infiniti QX56 (Z62). Manual — part 583
EC-310
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0420, P0430 THREE WAY CATALYST FUNCTION
6.
Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7.
Remove ignition coil and spark plug of the cylinder to be checked.
8.
Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9.
Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
11. Crank engine for approximately 3 seconds, and check whether
spark is generated between the spark plug and the grounded
metal portion.
CAUTION:
• Never place the spark plug and the ignition coil within 50
cm (19.7 in) each other. Be careful not to get an electrical
shock while checking, because the electrical discharge
voltage becomes 20 kV or more.
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc-
tioning.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 7.
7.
CHECK FUNCTION OF IGNITION COIL-II
1.
Turn ignition switch OFF.
2.
Disconnect spark plug and connect a non-malfunctioning spark plug.
3.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark
plug and the grounded metal portion.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Check ignition coil, power transistor and their circuits. Refer to
.
8.
CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
Is the inspection result normal?
YES
>> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to
.
NO
>> Repair or clean spark plug. Then GO TO 9.
9.
CHECK FUNCTION OF IGNITION COIL-III
1.
Reconnect the initial spark plugs.
2.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark
plug and the grounded portion.
Is the inspection result normal?
YES
>> INSPECTION END
Spark should be generated.
JMBIA0066GB
Spark should be generated.
SEF156I
Spark should be generated.
P0420, P0430 THREE WAY CATALYST FUNCTION
EC-311
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
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EC
N
P
O
NO
>> Replace spark plug(s) with standard type one(s). For spark plug type, refer to
.
10.
CHECK FUEL INJECTOR
1.
Turn ignition switch OFF.
2.
Remove fuel injector assembly.
Refer to
EM-49, "Removal and Installation"
Keep fuel hose and all fuel injectors connected to fuel tube.
3.
Disconnect all ignition coil harness connectors.
4.
Reconnect all fuel injector harness connectors disconnected.
5.
Turn ignition switch ON.
6.
Check that fuel does not drip from fuel injector.
Does fuel drip from fuel injector?
YES
>> Replace the fuel injector(s) from which fuel is dripping.
NO
>> GO TO 11.
11.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace three way catalyst assembly.
NO
>> Repair or replace harness or connector.
EC-312
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0441 EVAP CONTROL SYSTEM
P0441 EVAP CONTROL SYSTEM
DTC Logic
INFOID:0000000006288304
DTC DETECTION LOGIC
NOTE:
If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform
trouble diagnosis for other DTC.
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions.
Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP
canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP con-
trol system pressure sensor to intake manifold vacuum.
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow
are adequate. If not, a malfunction is determined.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
Will CONSULT-III be used?
YES
>> GO TO 2.
NO
>> GO TO 5.
2.
PERFORM DTC CONFIRMATION PROCEDURE-I
PBIB1026E
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0441
EVAP PURG FLOW/MON
(EVAP control system incor-
rect purge flow)
EVAP control system does not operate
properly, EVAP control system has a leak
between intake manifold and EVAP control
system pressure sensor.
• EVAP canister purge volume control sole-
noid valve stuck closed
• EVAP control system pressure sensor and
the circuit
• Loose, disconnected or improper connection
of rubber tube
• Blocked rubber tube
• Cracked EVAP canister
• EVAP canister purge volume control sole-
noid valve circuit
• Accelerator pedal position sensor
• Blocked purge port
• EVAP canister vent control valve
P0441 EVAP CONTROL SYSTEM
EC-313
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
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EC
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WITH CONSULT-III
TESTING CONDITION:
Always perform test at a temperature of 5
°
C (41
°
F) or more.
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Start engine and let it idle for at least 70 seconds.
6.
Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-III.
7.
Touch “START”.
Is “COMPLETED” displayed on CONSULT-III screen?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-II
When the following conditions are met, “TESTING” will be displayed on the CONSULT-III screen. Maintain the
conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.)
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “TESTING” does not change for a long time, retry from step 2.
Is “COMPLETED” displayed on CONSULT-III screen?
YES
>> GO TO 4.
NO
>> Perform DTC CONFIRMATION PROCEDURE again. GO TO 2.
4.
PERFORM DTC CONFIRMATION PROCEDURE-III
Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?
OK
>> INSPECTION END
NG
>> Proceed to
.
5.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
Perform component function check. Refer to
EC-313, "Component Function Check"
.
NOTE:
Use component function check to check the overall monitoring function of the EVAP control system purge flow
monitoring. During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Component Function Check
INFOID:0000000006288305
1.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
1.
Lift up drive wheels.
2.
Start engine (VDC switch OFF) and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and wait at least 70 seconds.
Selector lever
Suitable position
VHCL SPEED SE
32 - 120 km/h (20 - 75 MPH)
ENG SPEED
500 - 3,000 rpm
B/FUEL SCHDL
1.3 - 9.0 msec
COOLAN TEMP/S
More than 0
°
C (32
°
F)
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