Nissan Pathfinder (2007 year). Manual — part 188
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-371
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2007 Pathfinder
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
PFP:20905
On Board Diagnosis Logic
UBS00K8U
The ECM monitors the switching frequency ratio of air fuel ratio (A/F)
sensor 1 and heated oxygen sensor 2.
A three way catalyst (manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated
oxygen sensor 2 approaches a specified limit value, the three way
catalyst (manifold) malfunction is diagnosed.
DTC Confirmation Procedure
UBS00K8V
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.
WITH CONSULT-II
TESTING CONDITION:
Do not hold engine speed for more than the specified minutes below.
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Start engine and warm it up to the normal operating tempera-
ture.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Make sure that “COOLAN TEMP/S” indicates more than 70
°
C
(158
°
F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70
°
C (158
°
F).
7.
Open engine hood.
PBIB2377E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0420
0420
(Bank 1)
Catalyst system effi-
ciency below threshold
●
Three way catalyst (manifold) does not oper-
ate properly.
●
Three way catalyst (manifold) does not have
enough oxygen storage capacity.
●
Three way catalyst (manifold)
●
Exhaust tube
●
Intake air leaks
●
Fuel injector
●
Fuel injector leaks
●
Spark plug
●
Improper ignition timing
P0430
0430
(Bank 2)
SEF189Y
EC-372
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2007 Pathfinder
8.
Select “DTC & SRT CONFIRMATION” then “SRT WORK SUP-
PORT” mode with CONSULT-II.
9.
Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecu-
tive minutes then release the accelerator pedal completely.
If “INCMP” of “CATALYST” changed to “CMPLT”, go to step 12.
10. Wait 5 seconds at idle.
11. Rev engine up to 2,000 to 3,000 rpm and maintain it until
“INCMP” of “CATALYST” changes to “CMPLT” (It will take
approximately 5 minutes).
If not “CMPLT”, stop engine and cool it down to less than 70
°
C
(158
°
F) and then retest from step 1.
12. Select “SELF-DIAG RESULTS” mode with CONSULT-II.
13. Confirm that the 1st trip DTC is not detected.
If the 1st trip DTC is detected, go to
Overall Function Check
UBS00K8W
Use this procedure to check the overall function of the three way catalyst (manifold). During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1.
Start engine and warm it up to the normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Open engine hood.
6.
Set voltmeter probe between ECM terminals 74 [HO2S2 (bank
1) signal], 55 [HO2S2 (bank 2) signal] and ground.
7.
Keep engine speed at 2,500 rpm constant under no load.
8.
Make sure that the voltage does not vary for more than 5 sec-
onds.
If the voltage fluctuation cycle takes less than 5 seconds, go to
EC-373, "Diagnostic Procedure"
●
1 cycle: 0.6 - 1.0
→
0 - 0.3
→
0.6 - 1.0
PBIB1784E
PBIB1785E
SEF535Z
PBIB1108E
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-373
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2007 Pathfinder
Diagnostic Procedure
UBS00K8X
1.
CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before the three way catalyst (manifold).
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace.
4.
CHECK IGNITION TIMING
Check the following items. Refer to
OK or NG
OK
>> GO TO 5.
NG
>> Follow the
PBIB1216E
Items
Specifications
Target idle speed
625
±
50 rpm (in P or N position)
Ignition timing
15
±
5
°
BTDC (in P or N position)
EC-374
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2007 Pathfinder
5.
CHECK FUEL INJECTOR
1.
Stop engine and then turn ignition switch ON.
2.
Check voltage between ECM terminals 21, 22, 23, 40, 41, 42
and ground with CONSULT-II or tester.
Refer to Wiring Diagram for FUEL INJECTOR,
.
OK or NG
OK
>> GO TO 6.
NG
>> Perform
EC-632, "Diagnostic Procedure"
6.
CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1.
Turn ignition switch OFF.
2.
Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
3.
Start engine.
4.
After engine stalls, crank it two or three times to release all fuel
pressure.
5.
Turn ignition switch OFF.
6.
Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.
7.
Remove ignition coil and spark plug of the cylinder to be
checked.
8.
Crank engine for five 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
between the edge of the spark plug and grounded metal portion
as shown in the figure.
11. Crank engine for about three seconds, and check whether spark
is generated between the spark plug and the grounded metal
portion.
CAUTION:
●
Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.
●
It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 7.
Battery voltage should exist.
PBIB1172E
Spark should be generated.
BBIA0534E
PBIB2325E
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-375
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2007 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-376
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
2007 Pathfinder
11.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "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-377
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2007 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-378
DTC P0441 EVAP CONTROL SYSTEM
2007 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
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