Nissan Pathfinder (2008 year). Manual - part 319

EC-848, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace the accelerator pedal assembly.

EC-497, "Accelerator Pedal Released Position Learning"

EC-497, "Idle Air Volume Learning"

>> INSPECTION END

CHECK THROTTLE POSITION SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 66.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 8.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 50 and electric throttle control actuator terminal 1.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 9.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR

EC-670, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 10.

10.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace the electric throttle control actuator.

EC-497, "Idle Air Volume Learning"

>> INSPECTION END

11.

CHECK INTERMITTENT INCIDENT

GI-51, "Intermittent Incident"

Continuity should exist.

EC-670

< COMPONENT DIAGNOSIS >

[VK56DE]

P0222, P0223 APP SENSOR

>> INSPECTION END

Component Inspection

INFOID:0000000001537749

THROTTLE POSITION SENSOR

Reconnect all harness connectors disconnected.

Turn ignition switch ON.

Set selector lever to D position.

Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under the following condi-
tions.

If NG, replace electric throttle control actuator and go to the next
step.

EC-497, "Idle Air Volume Learning"

Terminal

Accelerator pedal

Voltage

50
(Throttle position sensor 1)

Fully released

More than 0.36V

Fully depressed

Less than 4.75V

69
(Throttle position sensor 2)

Fully released

Less than 4.75V

Fully depressed

More than 0.36V

PBIB1530E

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

EC-671

< COMPONENT DIAGNOSIS >

[VK56DE]

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MIS-
FIRE

On Board Diagnosis Logic

INFOID:0000000001537750

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.

The misfire detection logic consists of the following two conditions.
1.

One Trip Detection Logic (Three Way Catalyst Damage)
On the 1st trip that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-
heating, the MIL will blink.
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.
If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.

Two Trip Detection Logic (Exhaust quality deterioration)
For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sen-
sor signal every 1,000 engine revolutions.
A misfire malfunction can be detected on any one cylinder or on multiple cylinders.

DTC Confirmation Procedure

INFOID:0000000001537751

CAUTION:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driv-
ing.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Sensor

Input signal to ECM

ECM function

Crankshaft position sensor (POS)

Engine speed

On board diagnosis of misfire

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0300
0300

Multiple cylinder misfire
detected

Multiple cylinder misfire.

• Improper spark plug
• Insufficient compression
• Incorrect fuel pressure
• The fuel injector circuit is open or shorted
• Fuel injector
• Intake air leak
• The ignition signal circuit is open or short-

• Lack of fuel
• Signal plate
• Air fuel ratio (A/F) sensor 1
• Incorrect PCV hose connection

P0301
0301

No.1 cylinder misfire de-
tected

No. 1 cylinder misfires.

P0302
0302

No. 2 cylinder misfire
detected

No. 2 cylinder misfires.

P0303
0303

No. 3 cylinder misfire
detected

No. 3 cylinder misfires.

P0304
0304

No. 4 cylinder misfire
detected

No. 4 cylinder misfires.

P0305
0305

No. 5 cylinder misfire
detected

No. 5 cylinder misfires.

P0306
0306

No. 6 cylinder misfire
detected

No. 6 cylinder misfires.

P0307
0307

No. 7 cylinder misfire
detected

No. 7 cylinder misfires.

P0308
0308

No. 8 cylinder misfire
detected

No. 8 cylinder misfires.

EC-672

< COMPONENT DIAGNOSIS >

[VK56DE]

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

Turn ignition switch OFF and wait at least 10 seconds.

WITH CONSULT-III

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Restart engine and let it idle for about 15 minutes.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-672, "Diagnosis Procedure"

NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain
time. Refer to the table below.
Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.

The time to driving varies according to the engine speed in the freeze frame data.

WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000001537752

CHECK FOR INTAKE AIR LEAK AND PCV HOSE

Start engine and run it at idle speed.

Listen for the sound of the intake air leak.

Check PCV hose connection.

OK or NG

>> GO TO 2.

>> Discover air leak location and repair.

CHECK FOR EXHAUST SYSTEM CLOGGING

Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.

OK or NG

>> GO TO 3.

>> Repair or replace it.

Engine speed

Engine speed in the freeze frame data

400 rpm

Vehicle speed

Vehicle speed in the freeze frame data

10 km/h (6 MPH)

Engine coolant temperature (T)
condition

When the freeze frame data shows lower than 70

C (158

F),

T should be lower than 70

C (158

F).

When the freeze frame data shows higher than or equal to 70

C (158

F),

T should be higher than or equal to 70

C (158

F).

Engine speed

Time

Around 1,000 rpm

Approximately 10 minutes

Around 2,000 rpm

Approximately 5 minutes

More than 3,000 rpm

Approximately 3.5 minutes

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

EC-673

< COMPONENT DIAGNOSIS >

[VK56DE]

PERFORM POWER BALANCE TEST

With CONSULT-III

Perform “POWER BALANCE” in “ACTIVE TEST” mode.

Is there any cylinder which does not produce a momentary engine speed drop?

Without CONSULT-III

When disconnecting each fuel injector harness connector one at a time, is there any cylinder which does not
produce a momentary engine speed drop?

Yes or No

Yes

>> GO TO 4.

>> GO TO 7.

CHECK FUEL INJECTOR

Does each fuel injector make an operating sound at idle?

Yes or No

Yes

>> GO TO 5.

>> Check fuel injector(s) and circuit(s). Refer to

EC-864

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.

Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pres-
sure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pres-
sure applies again during the following procedure.

Start engine.

After engine stalls, crank it two or three times to release all fuel
pressure.

Turn ignition switch OFF.

Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.

Remove ignition coil and spark plug of the cylinder to be
checked.

Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

Connect spark plug and harness connector to ignition coil.

BBIA0374E

PBIB1986E

ALBIA0351ZZ

EC-674

< COMPONENT DIAGNOSIS >

[VK56DE]

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

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 3 seconds, and check whether spark is

generated between the spark plug and the grounded metal por-
tion.

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

>> GO TO 9.

>> GO TO 6.

CHECK FUNCTION OF IGNITION COIL-II

Turn ignition switch OFF.

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

Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.

OK or NG

>> GO TO 7.

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

EC-870

CHECK SPARK PLUG

Check the initial spark plug for fouling, etc.
OK or NG

>> Replace malfunctioning spark plug(s) with standard type

one(s). For spark plug type, refer to

EM-156, "Removal

and Installation"

>> 1.

Repair or clean spark plug.

GO TO 8.

CHECK FUNCTION OF IGNITION COIL-III

Reconnect the initial spark plugs.

Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded portion.

OK or NG

>> INSPECTION END

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

EM-

156, "Removal and Installation"

CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to

EM-163, "Compression Pressure"

OK or NG

Spark should be generated.

PBIB2325E

Spark should be generated.

SEF156I

Spark should be generated.

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

EC-675

< COMPONENT DIAGNOSIS >

[VK56DE]

>> GO TO 10.

>> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

10.

CHECK FUEL PRESSURE

Install all removed parts.

Release fuel pressure to zero. Refer to

EC-948, "Fuel Pressure Check"

Install fuel pressure gauge and check fuel pressure. Refer to

EC-948, "Fuel Pressure Check"

OK or NG

>> GO TO 12.

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Fuel pump and circuit (Refer to

EC-897, "Wiring Diagram - ENGINE CONTROL SYSTEM -"

• Fuel pressure regulator (Refer to

EC-948, "Fuel Pressure Check"

• Fuel lines
• Fuel filter for clogging

>> Repair or replace.

12.

CHECK IGNITION TIMING

Check the following items. Refer to

EC-492, "Basic Inspection"

OK or NG

>> GO TO 13.

>> Follow the

EC-492, "Basic Inspection"

13.

CHECK A/F SENSOR 1 INPUT SIGNAL

Turn ignition switch OFF.

Disconnect A/F sensor 1 harness connector.

Disconnect ECM harness connector.

Check harness continuity between the following terminals.
Refer to Wiring Diagram.

At idling: Approximately 350 kPa (3.57 kg/cm

, 51 psi)

Items

Specifications

Target idle speed

650

50 rpm (in P or N position)

Ignition timing

BTDC (in P or N position)

ALBIA0360ZZ

A/F sensor 1 (bank 2) harness connector

A/F sensor 1 (bank 2)

A/F sensor 1 (bank 1)

A/F sensor 1 (bank 1) harness connector

: Vehicle front

EC-676

< COMPONENT DIAGNOSIS >

[VK56DE]

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.

Also check harness for short to power.

OK or NG

>> GO TO 14.

>> Repair open circuit or short to ground or short to power in harness or connectors.

14.

CHECK A/F SENSOR 1 HEATER