Infiniti EX35. Manual - part 631

EC-266

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0420, P0430 THREE WAY CATALYST FUNCTION

2.

Disconnect spark plug and connect a known-good spark plug.

3.

Crank engine for about 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-458, "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-140, "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 about three seconds, and recheck whether spark is generated between the spark plug
and the grounded portion.

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

EM-140, "Spark

Plug"

.

10.

CHECK FUEL INJECTOR

1.

Turn ignition switch OFF.

2.

Remove fuel injector assembly.
Refer to 

EM-37, "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.

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-38, "Intermittent Incident"

.

Is the trouble fixed?

YES

>> INSPECTION END

NO

>> Replace three way catalyst assembly.

Spark should be generated.

SEF156I

Spark should be generated.

P0441 EVAP CONTROL SYSTEM

EC-267

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0441 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000003133422

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.

INSPECTION START

Do you have CONSULT-III?

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 6.

2.

PRECONDITIONING

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:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0441

EVAP control system in-
correct purge flow

EVAP control system does not operate proper-
ly, EVAP control system has a leak between in-
take manifold and EVAP control system 
pressure sensor.

• EVAP canister purge volume control so-

lenoid valve stuck closed

• EVAP control system pressure sensor 

and the circuit

• Loose, disconnected or improper con-

nection of rubber tube

• Blocked rubber tube
• Cracked EVAP canister
• EVAP canister purge volume control so-

lenoid valve circuit

• Accelerator pedal position sensor
• Blocked purge port
• EVAP canister vent control valve

PBIB1026E

EC-268

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0441 EVAP CONTROL SYSTEM

Always perform test at a temperature of 5

°

C (41

°

F) or more.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and let it idle for at least 70 seconds.

4.

Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-III.

5.

Touch “START”.

Is “COMPLETED” displayed on CONSULT-III screen?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

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.
Is “COMPLETED” displayed on CONSULT-III screen?

YES

>> GO TO 5.

NO

>> Perform DTC CONFIRMATION PROCEDURE again. GO TO 3.

5.

PERFORM DTC CONFIRMATION PROCEDURE-III

Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-269, "Diagnosis Procedure"

.

6.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-268, "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

>> Go to 

EC-269, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000003133423

1.

PERFORM COMPONENT FUNCTION CHECK

Without CONSULT-III

1.

Lift up drive wheels.

2.

Start engine (VDC switch OFF) and warm it up to normal operating temperature.

3.

Turn ignition switch OFF, wait at least 10 seconds.

4.

Start engine and wait at least 70 seconds.

5.

Set voltmeter probes to ECM harness connector terminals under the following condition.

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)

P0441 EVAP CONTROL SYSTEM

EC-269

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

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EC

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P

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6.

Check EVAP control system pressure sensor value at idle speed and note it.

7.

Establish and maintain the following conditions for at least 1 minute.

8.

Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-269, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003133424

1.

CHECK EVAP CANISTER

1.

Turn ignition switch OFF.

2.

Check EVAP canister for cracks.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO

>> Replace EVAP canister.

2.

CHECK PURGE FLOW

With CONSULT-III

1.

Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port.

2.

Start engine and let it idle.

3.

Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III.

4.

Touch “Qd” and “Qu” on CONSULT-III screen to adjust “PURG VOL CONT/V” opening and check vacuum
existence.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

3.

CHECK PURGE FLOW

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine.

3.

Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to 

EC-74, "System Dia-

gram"

.

4.

Start engine and let it idle.

ECM

Connector

+

–

Terminal

Terminal

M107

102

(EVAP control system pressure sensor signal)

112

Air conditioner switch

ON

Headlamp switch

ON

Rear window defogger switch

ON

Engine speed

Approx. 3,000 rpm

Gear position

Any position other than P, N or R

PURG VOL CONT/V

Vacuum

100%

Existed

0%

Not existed