Nissan Maxima. Manual - part 456

EC-308

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0420, P0430 THREE WAY CATALYST FUNCTION

• 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 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 circuit. Refer to 

EC-502, "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-130, "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-12, "Removal

and Installation"

.

10.

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

2. Remove fuel injector assembly.

Refer to 

EM-43, "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.

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. Refer to 

EM-43, "Removal and Installa-

tion"

.

NO

>> GO TO 11.

11.

CHECK INTERMITTENT INCIDENT

Spark should be generated.

SEF156I

Spark should be generated.

P0420, P0430 THREE WAY CATALYST FUNCTION

EC-309

< DTC/CIRCUIT DIAGNOSIS >

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Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace three way catalyst assembly. Refer to 

EM-31, "Removal and Installation (LH)"

 (LH) or

EM-33, "Removal and Installation (RH)"

 (RH).

NO

>> Repair or Replace harness or connector.

EC-310

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0441 EVAP CONTROL SYSTEM

P0441 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000010095001

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

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

NO

>> GO TO 6.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

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 leakage between 
intake manifold and EVAP control system pres-
sure 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
• Drain filter

PBIB3640E

P0441 EVAP CONTROL SYSTEM

EC-311

< DTC/CIRCUIT DIAGNOSIS >

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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.

TESTING CONDITION:

Always perform test at a temperature of 5

°C (41°F) or more.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT

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.

7. Touch “START”.
Is “COMPLETED” displayed on CONSULT 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 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.

If “TESTING” does not change for a long time, retry from step 2.
Is “COMPLETED” displayed on CONSULT 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 screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-312, "Diagnosis Procedure"

.

6.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-311, "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-312, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000010095002

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

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)