Nissan Pathfinder (2011 year). Instruction - part 360

EC-934

< SYMPTOM DIAGNOSIS >

[VK56DE]

ENGINE CONTROL SYSTEM SYMPTOMS

1 - 6: The numbers refer to the order of inspection.
(continued on next table)

SYSTEM — ENGINE MECHANICAL & OTHER

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-632
EC-636

Engine coolant temperature sensor circuit

3

3

3

EC-646
EC-650

Air fuel ratio (A/F) sensor 1 circuit

EC-665
EC-669
EC-673
EC-677
EC-897

Throttle position sensor circuit

2

2

EC-653
EC-718
EC-837
EC-839
EC-889

Accelerator pedal position sensor circuit

3

2

1

EC-820
EC-882
EC-885
EC-893

Knock sensor circuit

2

3

EC-729

Crankshaft position sensor (POS) circuit

2

2

EC-732

Camshaft position sensor (PHASE) circuit

3

2

EC-736

Vehicle speed signal circuit

2

3

3

3

EC-806

Power steering pressure sensor circuit

2

3

3

EC-812

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-815
EC-817
EC-819

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-629

Park/neutral position (PNP) signal circuit

3

3

3

3

3

EC-823

Refrigerant pressure sensor circuit

2

3

3

4

EC-930

Electrical load signal circuit

3

EC-909

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-4

 or 

HAC-128

ABS actuator and electric unit (control unit)

4

EC-832

SYMPTOM

Refer-
ence page

HARD/NO S

TA

R

T/RES

TA

R

T (E

XCP

. HA)

E

N

GINE

 ST

ALL

HES

IT

A

TION/SURGING/FLA

T

 SPOT

S

P

ARK KNOC

K

/DET

O

NA

TI

ON

LACK OF 

POWER/POOR ACCELERA

TION

HIG

H

 IDL

E

/L

OW

 ID

LE

ROUGH IDLE/HUNTING

ID

LING VI

BRA

T

ION

S

LOW/NO RETU

RN 

T

O ID

LE

OVERHEA

T

S

/W

A

TER TEMPERA

T

URE HIG

H

E

XCESSIVE

 FUEL CON

S

UMP

T

ION

E

XCESSIVE

 OIL 

C

O

NSUMP

T

ION

B

A

TTER

Y 

DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF AG AH

AJ

AK

AL

AM HA

2011 Pathfinder

ENGINE CONTROL SYSTEM SYMPTOMS

EC-935

< SYMPTOM DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

SYMPTOM

Reference 
page

HARD/NO ST

AR

T/REST

AR

T (EXCP

. 

HA)

E

N

GI

N

E

 ST

AL

L

HESIT

A

TION/S

U

R

GING/F

LA

T SP

OT

SP

ARK KNOCK/DE

T

O

NA

TION

LACK OF POWE

R/POOR

 ACCELERA

TIO

N

HIGH IDL

E/L

OW

 IDL

E

ROUG

H IDLE/HU

NTING

IDL

ING VIBRA

T

ION

SLO

W

/NO RETURN T

O

 IDLE

OVERHEA

T

S/W

A

TE

R

 TEMPERA

T

URE 

HIGH

EXCES

SIVE F

U

EL CONSUMP

T

ION

EXCES

SIVE OI

L CONSUMP

T

IO

N

BA

TTE

R

Y 

DEAD (UN

D

E

R

 CH

A

R

GE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

Fuel

Fuel tank

5

5

FL-6

Fuel piping

5

5

5

5

5

5

FL-5

Vapor lock

—

Valve deposit

5

5

5

5

5

5

5

—

Poor fuel (Heavy weight gasoline, 
Low octane)

—

Air

Air duct

5

5

5

5

5

5

EM-165

Air cleaner

EM-165

Air leakage from air duct
(Mass air flow sensor — electric 
throttle control actuator)

5

5

5

5

EM-165

Electric throttle control actuator

EM-166

Air leakage from intake manifold/
Collector/Gasket

EM-166

Cranking

Battery

1

1

1

1

1

1

1

1

PG-5

Generator circuit

CHG-5

Starter circuit

3

STR-5

Signal plate

6

EM-200

Park/neutral position (PNP) sig-
nal

4

TM-50

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-215

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-230

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-195

Camshaft

EM-200

Intake valve timing control

EM-195

Intake valve

3

EM-215

Exhaust valve

2011 Pathfinder

EC-936

< SYMPTOM DIAGNOSIS >

[VK56DE]

ENGINE CONTROL SYSTEM SYMPTOMS

1 - 6: The numbers refer to the order of inspection.

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-170

Three way catalyst

Lubrica-
tion

Oil pan/Oil strainer/Oil pump/Oil 
filter/Oil gallery/Oil cooler

5

5

5

5

5

5

5

5

LU-29
LU-30
LU-32
LU-34

Oil level (Low)/Filthy oil

LU-26

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-42

Thermostat

5

CO-57

Water pump

CO-55

Water gallery

CO-38

Cooling fan

5

CO-52
CO-53

Coolant level (Low)/Contaminat-
ed coolant

5

CO-42

NVIS (NISSAN Vehicle Immobilizer System — 
NATS)

1

1

SEC-5

 or 

SEC-115

SYMPTOM

Reference 
page

HARD/NO S

TA

R

T/RES

TA

R

T (E

XCP

. HA)

E

N

GINE

 ST

ALL

HES

IT

A

TION/SURGING/FLA

T

 SPOT

S

P

ARK KNOC

K

/DET

O

NA

TI

ON

LACK OF 

POWER/POOR ACCELERA

TION

HIG

H

 IDL

E

/L

OW

 ID

LE

ROUGH IDLE/HUNTING

ID

LING VI

BRA

T

ION

S

LOW/NO RETU

RN 

T

O ID

LE

OVERHEA

T

S

/W

A

TER TEMPERA

T

URE HIG

H

E

XCESSIVE

 FUEL CON

S

UMP

T

ION

E

XCESSIVE

 OIL 

C

O

NSUMP

T

ION

B

A

TTER

Y 

DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

2011 Pathfinder

NORMAL OPERATING CONDITION

EC-937

< SYMPTOM DIAGNOSIS >

[VK56DE]

C

D

E

F

G

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EC

N

P

O

NORMAL OPERATING CONDITION

Fuel Cut Control (at No Load and High Engine Speed)

INFOID:0000000006244634

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM via the CAN communication line.

SYSTEM DESCRIPTION

If the engine speed is above 2,400 rpm under no load (for example, the selector lever position is neutral and

engine speed over is 2,400 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-

ies based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,000 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under 

EC-503, "System Description"

.

Sensor

Input signal to ECM

ECM function

Actuator

Accelerator pedal position sensor

Accelerator pedal position

Fuel cut control Fuel injector

Engine coolant temperature sensor

Engine coolant temperature

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Unified meter control unit

Neutral position

Vehicle speed*

2011 Pathfinder

EC-938

< PERIODIC MAINTENANCE >

[VK56DE]

FUEL PRESSURE

PERIODIC MAINTENANCE

FUEL PRESSURE

Fuel Pressure Check

INFOID:0000000006244640

FUEL PRESSURE RELEASE

 With CONSULT-III

1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-III.
3. Start engine.
4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5. Turn ignition switch OFF.

 Without CONSULT-III

1. Remove fuel pump fuse (1) located in IPDM E/R (2).
2. Start engine.
3. After engine stalls, crank it 2 or 3 times to release all fuel pres-

sure.

4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.

FUEL PRESSURE CHECK

CAUTION:

• Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.

• Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick

connector o-ring maintains seal ability.

• Use Fuel Pressure Gauge Kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-44321-6)] to check

fuel pressure.

• Never perform fuel pressure check with electrical system operating (i.e. lights, rear window defog-

ger, A/C, etc.). Fuel pressure gauge may indicate false readings due to varying engine loads and

changes in manifold vacuum.

NOTE:

Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-

sure cannot be completely released because R51 models do not have fuel return system.

1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release [SST (J-45488)]. Refer to 

EM-181, "Exploded View"

.

• Never twist or kink fuel hose because it is plastic hose.

• Never remove fuel hose from quick connector.

• Keep fuel hose connections clean.

4. Install Fuel Pressure Adapter [SST (J-44321-6)] and Fuel Pres-

sure Gauge [SST (J-44321)] (1) as shown in the figure.

• Never distort or bend fuel rail tube when installing fuel pres-

sure gauge adapter.

• When reconnecting fuel hose, check the original fuel hose for

damage and abnormality.

5. Turn ignition switch ON (reactivate fuel pump), and check for

fuel leakage.

6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge.

ALBIA0351ZZ

ALBIA0367ZZ

2011 Pathfinder

FUEL PRESSURE

EC-939

< PERIODIC MAINTENANCE >

[VK56DE]

C

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N

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O

• During fuel pressure check, check for fuel leakage from fuel connection every 3 minutes.

8. If result is unsatisfactory, go to next step.
9. Check the following.

• Fuel hoses and fuel tubes for clogging

• Fuel filter for clogging

• Fuel pump

• Fuel pressure regulator for clogging

If OK, replace fuel pressure regulator. Refer to 

FL-11

.

If NG, repair or replace malfunctioning part.

10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter [SST (J-44321-6)], release fuel

pressure to zero. Refer to "FUEL PRESSURE RELEASE".

At idling: Approximately 350 kPa (3.57 kg/cm

2

, 51 psi)

2011 Pathfinder

EC-940

< PERIODIC MAINTENANCE >

[VK56DE]

EVAP LEAK CHECK

EVAP LEAK CHECK

How to Detect EVAP Leakage

INFOID:0000000006244641

CAUTION:

• Never use compressed air or a high pressure pump.
• Never exceed 4.12 kPa (0.042 kg/cm

2

, 0.6 psi) of pressure in EVAP system.

NOTE:

• Never start engine.

• Improper installation of EVAP service port adapter (commercial service tool) to the EVAP service port may

cause a leak.

 WITH CONSULT-III

1. Attach the EVAP service port adapter (commercial service tool)

securely to the EVAP service port.

-

EVAP canister purge volume control solenoid valve (1)

-

: Vehicle front

2. Also attach the pressure pump and hose to the EVAP service

port adapter (commercial service tool).

3. Turn ignition switch ON.

4. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT

MODE” with CONSULT-III.

5. Touch “START”. A bar graph (Pressure indicating display) will

appear on the screen.

6. Apply positive pressure to the EVAP system until the pressure

indicator reaches the middle of the bar graph.

7. Remove EVAP service port adapter (commercial service tool)

and hose with pressure pump. Refer to 

FL-16, "Removal and

Installation"

.

8. Locate the leak using a leak detector (commercial service tool).

Refer to 

EC-512, "Description"

.

 WITHOUT CONSULT-III

ALBIA0349ZZ

SEF462UA

SEF200U

2011 Pathfinder

EVAP LEAK CHECK

EC-941

< PERIODIC MAINTENANCE >

[VK56DE]

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1. Attach the EVAP service port adapter (commercial service tool)

securely to the EVAP service port (2).

-

EVAP canister purge volume control solenoid valve (1)

-

: Vehicle front

2. Also attach the pressure pump with pressure gauge to the EVAP

service port adapter (commercial service tool).

3. Apply battery voltage between the terminals of EVAP canister

vent control valve (3) to make a closed EVAP system.

-

Fuel filler pipe (top of frame view) (1)

-

EVAP control system pressure sensor (2)

-

EVAP canister (4)

-

Drain filter (5)

-

: Vehicle front

4. To locate the leak, deliver positive pressure to the EVAP system

until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm

2

, 0.2 to 0.4 psi).

5. Remove EVAP service port adapter (commercial service tool)

and hose with pressure pump. Refer to 

FL-16, "Removal and

Installation"

.

6. Locate the leak using a leak detector (commercial service tool). Refer to 

EC-512, "Description"

.

ALBIA0349ZZ

SEF462UA

AWBIA0134ZZ

2011 Pathfinder