Nissan Pathfinder (2011 year). Manual - part 302

EC-470

< WIRING DIAGRAM >

[VQ40DE]

ENGINE CONTROL SYSTEM

AABIA0431GB

2011 Pathfinder

ENGINE CONTROL SYSTEM

EC-471

< WIRING DIAGRAM >

[VQ40DE]

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ABBIA0433GB

2011 Pathfinder

EC-472

< SYMPTOM DIAGNOSIS >

[VQ40DE]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000006244180

SYSTEM — BASIC ENGINE CONTROL SYSTEM

SYMPTOM

Reference 
page

HARD/NO ST

AR

T

/REST

AR

T

 (EXCP

. 

H

A

)

ENGINE ST

ALL

HESIT

A

TION/SURGING/FLA

T

 SPOT

SP

ARK KNOCK/DET

O

NA

TION

LACK

 OF POWER/

POOR 

ACC

E

LERA

TION

HIGH IDL

E/LOW

 IDLE

ROUG

H IDLE/HUNTING

IDLI

NG VIBRA

TION

SLOW

/NO RETURN T

O

 IDLE

OVERHEA

T

S/W

A

TER TEMPERA

T

UR

E

 HIGH

EXCESS

IVE F

U

E

L CONSUMP

T

IO

N

EXCESS

IVE OIL CONSUMP

T

ION

BA

TTER

Y

 DEAD (UNDER CHARGE)

Warranty symptom code

AA

AB

AC AD

AE

AF AG AH

AJ

AK

AL

AM HA

Fuel

Fuel  pump  circuit

1

1

2

3

2

2

2

3

2

EC-403

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-484

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-399

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-57

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-418

Incorrect idle speed adjustment

1

1

1

1

1

EC-20

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-362

, 

EC-368

Ignition Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-20

Ignition  circuit

1

1

2

2

2

2

2

2

EC-407

Power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-94

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-113

, 

EC-126

Engine coolant temperature sensor circuit

3

3

3

EC-132

, 

EC-140

Air fuel ratio (A/F) sensor 1

EC-148
EC-152
EC-156
EC-160
EC-385

Throttle position sensor circuit

2

2

EC-136

, 

EC-205

, 

EC-323

, 

EC-325

, 

EC-377

Accelerator pedal position sensor circuit

3

2

1

EC-94

, 

EC-

370

, 

EC-

373

, 

EC-

381

2011 Pathfinder

ENGINE CONTROL SYSTEM SYMPTOMS

EC-473

< SYMPTOM DIAGNOSIS >

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

SYSTEM — ENGINE MECHANICAL & OTHER

Knock sensor circuit

2

3

EC-216

Crankshaft position sensor (POS) circuit

2

2

EC-219

Camshaft position sensor (PHASE) circuit

3

2

EC-223

Vehicle speed signal circuit

2

3

3

3

EC-295

Power steering pressure sensor circuit

2

3

3

EC-303

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-306

, 

EC-308

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-110

PNP signal circuit

3

3

3

3

3

EC-314

VIAS control solenoid valve circuit

1

EC-353

Refrigerant pressure sensor circuit

2

3

3

4

EC-420

Electrical load signal circuit

3

EC-397

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-111

, 

HAC-178

ABS actuator and electric unit (control unit)

4

BRC-117

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

EC-474

< SYMPTOM DIAGNOSIS >

[VQ40DE]

ENGINE CONTROL SYSTEM SYMPTOMS

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-26

Air cleaner

EM-26

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

5

5

5

5

EM-26

Electric throttle control actuator

EM-27

Air leakage from intake manifold/
Collector/Gasket

EM-27

, 

EM-30

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-116

Park/neutral position (PNP) sig-
nal

4

TM-50

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-96

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-116

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-61

Camshaft

EM-78

Intake valve timing control

EM-61

Intake valve

3

EM-90

Exhaust valve

2011 Pathfinder

ENGINE CONTROL SYSTEM SYMPTOMS

EC-475

< SYMPTOM DIAGNOSIS >

[VQ40DE]

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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-33

, 

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

EM-36

, 

LU-

12

, 

LU-15

Oil level (Low)/Filthy oil

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

LU-8

Thermostat

5

CO-11

Water pump

CO-29

Water gallery

CO-31

Cooling fan

5

CO-21

   or

CO-22

Coolant level (Low)/Contaminat-
ed coolant

5

CO-11

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

EC-476

< SYMPTOM DIAGNOSIS >

[VQ40DE]

NORMAL OPERATING CONDITION

NORMAL OPERATING CONDITION

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

INFOID:0000000006244181

INPUT/OUTPUT SIGNAL CHART

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

SYSTEM DESCRIPTION

If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine

speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies

based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under 

EC-48, "System Description"

.

Sensor

Input Signal to ECM

ECM function

Actuator

TCM

Neutral position

Fuel cut control Fuel injector

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor

Engine coolant temperature

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

Engine speed

Wheel sensor

Vehicle speed*

2011 Pathfinder

PRECAUTIONS

EC-477

< PRECAUTION >

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PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000006710583

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this

Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness

connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.

• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with

a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution for Procedure without Cowl Top Cover

INFOID:0000000006710584

When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc to prevent damage to

windshield.

On Board Diagnosis (OBD) System of Engine and A/T

INFOID:0000000006244184

The ECM has an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the

driver of a malfunction causing emission deterioration.

CAUTION:

• Always turn the ignition switch OFF and disconnect the negative battery cable before any repair or

inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause

the MIL to illuminate.

• Always connect and lock the connectors securely after work. A loose (unlocked) connector will

cause the MIL to illuminate due to the open circuit. (Be sure the connector is free from water, grease,

dirt, bent terminals, etc.)

PIIB3706J

2011 Pathfinder