Nissan Pathfinder (2006 year). Manual — part 190
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-379
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2006 Pathfinder
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 about three seconds, and recheck whether spark is generated between the spark plug
and the grounded metal portion.
OK or NG
OK
>> GO TO 8.
NG
>> Check ignition coil, power transistor and their circuits. Refer to
8.
CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
OK or NG
OK
>> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to
.
NG
>> 1. Repair or clean spark plug.
2. 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.
OK or NG
OK
>> INSPECTION END
NG
>> 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-35, "FUEL INJECTOR AND FUEL TUBE"
Keep fuel hose and all fuel injectors connected to fuel tube.
3.
Reconnect all fuel injector harness connectors.
4.
Disconnect all ignition coil harness connectors.
5.
Turn ignition switch ON.
Make sure fuel does not drip from fuel injector.
OK or NG
OK (Does not drip.)>>GO TO 11.
NG (Drips.)>>Replace the fuel injector(s) from which fuel is dripping.
Spark should be generated.
SEF156I
Spark should be generated.
EC-380
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2006 Pathfinder
11.
CHECK INTERMITTENT INCIDENT
EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
Trouble is fixed.>>INSPECTION END
Trouble is not fixed.>>Replace three way catalyst (manifold).
DTC P0441 EVAP CONTROL SYSTEM
EC-381
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2006 Pathfinder
DTC P0441 EVAP CONTROL SYSTEM
PFP:14950
System Description
UBS00K8Y
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.
On Board Diagnosis Logic
UBS00K8Z
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
UBS00K90
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
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:
PBIB1026E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0441
0441
EVAP control system
incorrect purge flow
EVAP control system does not operate prop-
erly, EVAP control system has a leak between
intake manifold and EVAP control system pres-
sure sensor.
●
EVAP canister purge volume control
solenoid 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
solenoid valve circuit
●
Accelerator pedal position sensor
●
Blocked purge port
●
EVAP canister vent control valve
EC-382
DTC P0441 EVAP CONTROL SYSTEM
2006 Pathfinder
Always perform test at a temperature of 5
°
C (41
°
F) or more.
WITH CONSULT-II
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 CONFIRMATION” mode with CON-
SULT-II.
5.
Touch “START”.
If “COMPLETED” is displayed, go to step 7.
6.
When the following conditions are met, “TESTING” will be displayed on the CONSULT-II screen. Maintain
the conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.)
If “TESTING” is not changed for a long time, retry from step 2.
7.
Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to
Overall Function Check
UBS00K91
Use this procedure 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.
WITH GST
1.
Lift up drive wheels.
2.
Start engine (TCS switch or 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 terminals 32 (EVAP control system
pressure sensor signal) and ground.
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.
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
70 - 100
°
C (158 - 212
°
F)
PBIB0826E
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
PBIB1109E
DTC P0441 EVAP CONTROL SYSTEM
EC-383
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EC
2006 Pathfinder
8.
Verify that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.
9.
If NG, go to
EC-383, "Diagnostic Procedure"
Diagnostic Procedure
UBS00K92
1.
CHECK EVAP CANISTER
1.
Turn ignition switch OFF.
2.
Check EVAP canister for cracks.
OK or NG
OK (With CONSULT-II)>>GO TO 2.
OK (Without CONSULT-II)>>GO TO 3.
NG
>> Replace EVAP canister.
2.
CHECK PURGE FLOW
With CONSULT-II
1.
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
.
2.
Start engine and let it idle.
3.
Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-II.
4.
Rev engine up to 2,000 rpm.
5.
Touch “Qd” and “Qu” on CONSULT-II screen to adjust “PURG
VOL CONT/V” opening and check vacuum existence.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 4.
3.
CHECK PURGE FLOW
Without CONSULT-II
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
.
4.
Start engine and let it idle.
Do not depress accelerator pedal even slightly.
5.
Check vacuum gauge indication before 60 seconds passed after starting engine.
6.
Revving engine up to 2,000 rpm after 100 seconds passed after starting engine.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 4.
PURG VOL CONT/V
Vacuum
100%
Should exist.
0%
Should not exist.
PBIB1678E
Vacuum should not exist.
Vacuum should exist.
EC-384
DTC P0441 EVAP CONTROL SYSTEM
2006 Pathfinder
4.
CHECK EVAP PURGE LINE
1.
Turn ignition switch OFF.
2.
Check EVAP purge line for improper connection or disconnection.
Refer to
EC-33, "EVAPORATIVE EMISSION LINE DRAWING"
OK or NG
OK
>> GO TO 5.
NG
>> Repair it.
5.
CHECK EVAP PURGE HOSE AND PURGE PORT
1.
Disconnect purge hoses connected to EVAP service port (A)
and EVAP canister purge volume control solenoid valve (B).
2.
Blow air into each hose and EVAP purge port (C).
3.
Check that air flows freely.
OK or NG
OK (With CONSULT-II)>>GO TO 6.
OK (Without CONSULT-II)>>GO TO 7.
NG
>> Repair or clean hoses and/or purge port.
6.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
1.
Start engine.
2.
Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with
CONSULT-II. Check that engine speed varies according to the
valve opening.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-407, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace EVAP canister purge volume control solenoid valve.
SEF367U
SEF368U
PBIB1678E
DTC P0441 EVAP CONTROL SYSTEM
EC-385
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2006 Pathfinder
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check connectors for water.
OK or NG
OK
>> GO TO 9.
NG
>> Replace EVAP control system pressure sensor.
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
EC-426, "DTC Confirmation Procedure"
for DTC P0452,
EC-432, "DTC Confirmation Procedure"
P0453.
OK or NG
OK
>> GO TO 10.
NG
>> Replace EVAP control system pressure sensor.
10.
CHECK RUBBER TUBE FOR CLOGGING
1.
Disconnect rubber tube connected to EVAP canister vent control valve.
2.
Check the rubber tube for clogging.
OK or NG
OK
>> GO TO 11.
NG
>> Clean the rubber tube using an air blower.
11.
CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to
EC-414, "Component Inspection"
OK or NG
OK
>> GO TO 12.
NG
>> Replace EVAP canister vent control valve.
12.
CHECK EVAP PURGE LINE
Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to
EC-33, "EVAPORATIVE EMISSION LINE DRAWING"
.
OK or NG
OK
>> GO TO 13.
NG
>> Replace it.
13.
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 14.
14.
CHECK INTERMITTENT INCIDENT
Refer to
EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Water should not exist.
EC-386
DTC P0442 EVAP CONTROL SYSTEM
2006 Pathfinder
DTC P0442 EVAP CONTROL SYSTEM
PFP:14950
On Board Diagnosis Logic
UBS00K93
This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister
purge volume control solenoid valve, under the following Vacuum test conditions.
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-
ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold
vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0442
0442
EVAP control system
small leak detected
(negative pressure)
EVAP control system has a leak, EVAP
control system does not operate prop-
erly.
●
Incorrect fuel tank vacuum relief valve
●
Incorrect fuel filler cap used
●
Fuel filler cap remains open or fails to close.
●
Foreign matter caught in fuel filler cap.
●
Leak is in line between intake manifold and
EVAP canister purge volume control solenoid
valve.
●
Foreign matter caught in EVAP canister vent
control valve.
●
EVAP canister or fuel tank leaks
●
EVAP purge line (pipe and rubber tube) leaks
●
EVAP purge line rubber tube bent
●
Loose or disconnected rubber tube
●
EVAP canister vent control valve and the circuit
●
EVAP canister purge volume control solenoid
valve and the circuit
●
Fuel tank temperature sensor
●
O-ring of EVAP canister vent control valve is
missing or damaged
●
EVAP canister is saturated with water
●
EVAP control system pressure sensor
●
Fuel level sensor and the circuit
●
Refueling EVAP vapor cut valve
●
ORVR system leaks
PBIB1026E
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