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Nissan Pathfinder. Manual - part 496

EC-290

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0420, P0430 THREE WAY CATALYST FUNCTION

Is the inspection result normal?

YES

>> GO TO 6.

>> Perform

EC-430, "Diagnosis Procedure"

CHECK FUNCTION OF IGNITION COIL-I

CAUTION:

Perform the following procedure in a place with no combustible objects and good ventilation.

1. Turn ignition switch OFF.

2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.

NOTE:

Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-

dure.

3. Start engine.

4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.

5. Turn ignition switch OFF.

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:

• During the operation, always stay 0.5 m (19.7 in) or more

away from the spark plug and the ignition coil. Be careful

not to get an electrical shock while checking, because the

electrical discharge voltage becomes 20 kV or more.

• It might cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is taken.

NOTE:

When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal-

functioning.

Is the inspection result normal?

YES

>> GO TO 10.

>> GO TO 7.

CHECK FUNCTION OF IGNITION COIL-II

1. Turn ignition switch OFF.

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

3. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark

plug and the grounded metal portion.

ECM

Voltage

–

Connector

Terminal

Connector

Terminal

F51

E16

128

Battery voltage

Spark should be generated.

JMBIA0066GB

P0420, P0430 THREE WAY CATALYST FUNCTION

EC-291

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

Is the inspection result normal?

YES

>> GO TO 8.

>> Check ignition coil, power transistor and their circuit. Refer to

EC-437, "Diagnosis Procedure"

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-134, "Spark Plug"

>> Repair or clean spark plug. Then GO TO 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

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

EM-134, "Spark

Plug"

10.

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

2. Remove fuel injector assembly. Refer to

EM-47, "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 the 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-47, "Removal and Installa-

tion"

>> GO TO 11.

11.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to

GI-49, "Intermittent Incident"

Is the inspection result normal?

YES

>> Replace three way catalyst assembly. Refer to

EM-31, "Removal and Installation (bank 2)"

EM-

33, "Removal and Installation (bank 1)"

>> Repair or replace error-detected parts.

Spark should be generated.

SEF156I

Spark should be generated.

EC-292

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0441 EVAP CONTROL SYSTEM

P0441 EVAP CONTROL SYSTEM

DTC Logic

INFOID:0000000009178203

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

INSPECTION START

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

>> GO TO 6.

PRECONDITIONING

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

ing the next test.

PBIB1026E

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0441

EVAP PURG FLOW/MON
(Evaporative emission system
incorrect purge flow)

EVAP control system does not operate
properly, EVAP control system has a leak-
age between intake 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

P0441 EVAP CONTROL SYSTEM

EC-293

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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.

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.

>> GO TO 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.

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

PERFORM DTC CONFIRMATION PROCEDURE-III

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

>> INSPECTION END

>> Proceed to

EC-295, "Diagnosis Procedure"

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-294, "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

>> Proceed to

EC-295, "Diagnosis Procedure"

Component Function Check

INFOID:0000000009178204

PERFORM COMPONENT FUNCTION CHECK

Selector lever

Suitable position

VHCL SPEED SE

32 - 120 km/h (20 - 75 mph)

ENG SPEED

500 - 3,000 rpm

B/FUEL SCHDL

1.25 - 9.0 msec

COOLANT TEMP/S

More than 0

°C (32°F)

Content .. 494 495 496 497 ..