Nissan Pathfinder (2007 year). Manual - part 188

DTC P0420, P0430 THREE WAY CATALYST FUNCTION

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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 

EC-373, "Diagnostic Proce-

dure"

  .

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

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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 

EC-70, "Basic Inspection"

  .

OK or NG

OK

>> GO TO 5.

NG

>> Follow the 

EC-70, "Basic Inspection"

  .

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, 

EC-631

  .

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

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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 

EC-643

  .

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 

MA-19, "Changing Spark Plugs"

.

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 

MA-19, "Changing

Spark Plugs"

  .

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

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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 

EC-

379, "Diagnostic Procedure"

  .

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