Infiniti EX35. Manual — part 696

EC-526

< SYMPTOM DIAGNOSIS >

[VQ35HR]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000003133674

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-452

Fuel pressure regulator system

3

3

4

4

4

4

4

4

4

4

EC-538

Fuel injector circuit

1

1

2

3

2

2

2

2

EC-449

Evaporative emission system

3

3

4

4

4

4

4

4

4

4

EC-74

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-469

Incorrect idle speed adjustment

1

1

1

1

1

EC-12

Electric throttle control actuator

1

1

2

3

3

2

2

2

2

2

2

EC-360

,

EC-367

Ignition

Incorrect ignition timing adjustment

3

3

1

1

1

1

1

1

EC-12

Ignition circuit

1

1

2

2

2

2

2

2

EC-458

Main power supply and ground circuit

2

2

3

3

3

3

3

2

3

EC-133

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-157

,

EC-164

Engine coolant temperature sensor circuit

3

3

3

EC-172

,

EC-178

Air fuel ratio (A/F) sensor 1 circuit

EC-185

,

EC-189

,

EC-192

,

EC-195

,

EC-435

Throttle position sensor circuit

2

2

EC-175

,

EC-240

,

EC-356

,

EC-358

,

EC-369

Accelerator pedal position sensor circuit

3

2

1

EC-421

,

EC-425

,

EC-430

Knock sensor circuit

2

3

EC-249

ENGINE CONTROL SYSTEM SYMPTOMS

EC-527

< SYMPTOM DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

(continued on next page)

SYSTEM — ENGINE MECHANICAL & OTHER

Engine oil temperature sensor

4

2

3

EC-234

,

EC-237

Crankshaft position sensor (POS) circuit

2

2

EC-252

Camshaft position sensor (PHASE) circuit

3

2

EC-256

Vehicle speed signal circuit

2

3

3

3

EC-326

Power steering pressure sensor circuit

2

3

3

EC-332

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-334

,

EC-336

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-151

Exhaust valve timing control magnet retarder
circuit

3

2

1

3

2

2

3

3

EC-154

PNP signal circuit

3

3

3

3

3

EC-341

Refrigerant pressure sensor circuit

2

3

3

4

EC-471

Electrical load signal circuit

3

EC-447

Air conditioner circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-5

ABS actuator and electric unit (control unit)

4

BRC-4

SYMPTOM

Reference
page

HARD/NO S

T

A

R

T/RES

T

A

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

L

OW/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

EC-528

< SYMPTOM DIAGNOSIS >

[VQ35HR]

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-11

Fuel piping

5

5

5

5

5

5

EM-42

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-28

Air cleaner

EM-28

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

5

5

5

5

EM-28

Electric throttle control actuator

EM-29

Air leakage from intake manifold/
Collector/Gasket

EM-33

Cranking

Battery

1

1

1

1

1

1

1

1

PG-103

Generator circuit

CHG-22

,

CHG-23

Starter circuit

3

STR-17

Signal plate

6

EM-123

PNP signal

4

TM-50

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-111

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-123

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

ENGINE CONTROL SYSTEM SYMPTOMS

EC-529

< SYMPTOM DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

Valve
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-65

Camshaft

EM-71

Intake valve timing control

EM-65

Exhaust valve timing control

EM-65

Intake valve

3

EM-111

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-36

,

EX-6

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-46

,

LU-12

,

LU-

10

,

LU-12

Oil level (Low)/Filthy oil

LU-6

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-11

,

CO-11

Thermostat

5

CO-22

Water pump

CO-20

Water gallery

CO-24

Cooling fan

5

CO-17

Coolant level (Low)/Contaminat-
ed coolant

CO-7

IVIS (INFINITI Vehicle Immobilizer System —
NATS)

1

1

SEC-5

SYMPTOM

Reference
page

HARD/NO S

T

A

R

T/RES

T

A

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

L

OW/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