Nissan Pathfinder (2012 year). Manual - part 299

ENGINE CONTROL SYSTEM

EC-473

< WIRING DIAGRAM >

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AABIA0743GB

August 2012

2012 Pathfinder

EC-474

< WIRING DIAGRAM >

[VQ40DE]

ENGINE CONTROL SYSTEM

ABBIA0433GB

August 2012

2012 Pathfinder

ENGINE CONTROL SYSTEM SYMPTOMS

EC-475

< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Matrix Chart

INFOID:0000000007358395

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-406

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-487

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-402

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-421

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-365

, 

EC-371

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-410

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-388

Throttle position sensor circuit

2

2

EC-136

, 

EC-205

, 

EC-324

, 

EC-326

, 

EC-380

Accelerator pedal position sensor circuit

3

2

1

EC-94

, 

EC-

373

, 

EC-

376

, 

EC-

384

August 2012

2012 Pathfinder

EC-476

< SYMPTOM DIAGNOSIS >

[VQ40DE]

ENGINE CONTROL SYSTEM SYMPTOMS

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-296

Power steering pressure sensor circuit

2

3

3

EC-304

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-307

, 

EC-309

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-315

VIAS control solenoid valve circuit

1

EC-356

Refrigerant pressure sensor circuit

2

3

3

4

EC-423

Electrical load signal circuit

3

EC-400

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-111

, 

HAC-179

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

August 2012

2012 Pathfinder

ENGINE CONTROL SYSTEM SYMPTOMS

EC-477

< SYMPTOM DIAGNOSIS >

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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

, 

CHG-8

Starter circuit

3

STR-5

, 

STR-9

Signal plate

6

EM-115

Park/neutral position (PNP) sig-
nal

4

TM-51

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-115

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

August 2012

2012 Pathfinder

EC-478

< SYMPTOM DIAGNOSIS >

[VQ40DE]

ENGINE CONTROL SYSTEM SYMPTOMS

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

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

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-28

Water gallery

CO-30

Cooling fan

5

CO-20

   or

CO-21

Coolant level (Low)/Contaminat-
ed coolant

5

CO-11

NVIS (NISSAN Vehicle Immobilizer System — 
NATS)

1

1

SEC-5

 or 

SEC-116

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

August 2012

2012 Pathfinder

NORMAL OPERATING CONDITION

EC-479

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NORMAL OPERATING CONDITION

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

INFOID:0000000007358396

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*

August 2012

2012 Pathfinder

EC-480

< PRECAUTION >

[VQ40DE]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

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

INFOID:0000000008832066

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 SR and SB section of this Service Man-

ual.

WARNING:

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

the event of a collision which 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 the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

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

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT 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 Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000007833552

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″

LOCK

″

 position.

• Always use CONSULT to perform self-diagnosis as a part of each function inspection after finishing work. If

DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the 

″

ACC

″

 position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.

August 2012

2012 Pathfinder