Infiniti QX56 (Z62). Manual - part 583

 

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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 

EC-506, "Diagnosis Procedure"

.

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 

EM-132, "Spark Plug"

.

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]

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NO

>> Replace spark plug(s) with standard type one(s). For spark plug type, refer to 

EM-132, "Spark

Plug"

.

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

Refer to 

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]

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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 

EC-314, "Diagnosis Procedure"

.

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 

EC-314, "Diagnosis Procedure"

.

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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