Nissan Pathfinder. Manual - part 537

EC-454

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

VARIABLE INDUCTION AIR SYSTEM

 Without CONSULT

1. Stop engine and disconnect vacuum hose connected to power valve actuator 2.

2. Disconnect VIAS control solenoid valve 1 harness connector.

3. Start engine.

4. Rev engine quickly up to approximately 5,000 rpm.

5. Check vacuum existence under the following conditions.

Is the inspection result normal?

YES

>> Repair or replace power valve actuator 2. Refer to 

EC-14, "ENGINE CONTROL SYSTEM : Com-

ponent Parts Location"

.

NO

>> GO TO 7.

7.

CHECK VACUUM HOSE

1. Stop engine.

2. Check vacuum hose for crack, clogging, improper connection or

disconnection. Refer to 

EC-45, "VARIABLE INDUCTION AIR

SYSTEM : System Description"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair hoses or tubes.

8.

CHECK VIAS CONTROL SOLENOID VALVE 2

Check VIAS control solenoid valve 2. Refer to 

EC-393, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace VIAS control solenoid valve 2. Refer to 

EC-14, "ENGINE CONTROL SYSTEM : Compo-

nent Parts Location"

.

VIAS S/V 2

Vacuum

ON

Existed

OFF

Not existed

Condition

Operation

Idle

Existed

Rev engine quickly up to approximately 5,000 rpm

Not existed

SEF109L

ENGINE CONTROL SYSTEM SYMPTOMS

EC-455

< SYMPTOM DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000009178384

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-433

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-151

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-430

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-41

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-28

Incorrect idle speed adjustment

1

1

1

1

1

EC-147

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-402

, 

EC-407

Ignition Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-147

Ignition  circuit

1

1

2

2

2

2

2

2

EC-437

Power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-173

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-191

, 

EC-196

Engine coolant temperature sensor circuit

3

3

3

EC-206

, 

EC-210

Air fuel ratio (A/F) sensor 1 circuit

EC-217

, 

EC-221

, 

EC-224

, 

EC-246

, 

EC-396

Throttle position sensor circuit

2

2

EC-208

, 

EC-272

, 

EC-364

, 

EC-365

, 

EC-414

Accelerator pedal position sensor circuit

3

2

1

EC-354

, 

EC-409

, 

EC-411

, 

EC-416

EC-456

< SYMPTOM DIAGNOSIS >

[VQ35DE]

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-280

Engine oil temperature sensor

4

2

3

EC-266

, 

EC-270

Crankshaft position sensor (POS) circuit

2

2

EC-282

Camshaft position sensor (PHASE) circuit

3

2

EC-285

Vehicle speed signal circuit

2

3

3

3

EC-333

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-349

, 

EC-351

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-189

PNP signal circuit

3

3

3

3

3

EC-356

VIAS control solenoid valve 1 circuit

1

EC-390

VIAS control solenoid valve 2 circuit

1

EC-392

Refrigerant pressure sensor circuit

2

3

3

4

EC-448

Cooling  fan  control  module  circuit

5

5

5

5

5

5

5

5

4

5

EC-422

Electrical load signal circuit

3

EC-425

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HA-15

ABS actuator and electric unit (control unit)

4

BRC-52

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

ENGINE CONTROL SYSTEM SYMPTOMS

EC-457

< SYMPTOM DIAGNOSIS >

[VQ35DE]

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-5

Fuel piping

5

5

5

5

5

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-24

Air cleaner

EM-15

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

5

5

5

5

EM-24

Electric throttle control actuator

EM-26

Air leakage from intake manifold/
Collector/Gasket

EM-26

, 

EM-29

Cranking

Battery

1

1

1

1

1

1

1

1

PG-86

Generator circuit

CHG-14

 

(With EXP-
800 NI or 
GR8-1200 
NI)*, 

CHG-

17

(Without 

EXP-800 
NI or GR8-
1200 NI)*

Starter circuit

3

STR-10

 

(With GR8-
1200 NI)*, 

STR-13

 

(Without 
GR8-1200 
NI)*

Signal plate

6

EM-94

PNP signal

4

EC-356