Infiniti M35/M45 Y50. Manual - part 407

TROUBLE DIAGNOSIS

EC-101

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

SYSTEM — ENGINE MECHANICAL & OTHER

SYMPTOM

Reference 
page

HARD/

NO ST

AR

T/

REST

AR

T (

E

X

C

P

. HA)

ENGI

NE ST

ALL

HESIT

A

TION/SURG

ING/FL

A

T S

P

OT

SP

ARK K

N

O

C

K/DET

O

NA

TI

ON

L

A

CK 

OF P

O

W

E

R/POOR ACCEL

E

R

A

TION

HI

GH ID

L

E

/L

OW

 I

D

L

E

ROUGH IDL

E

/HUNTI

N

G

ID

L

ING VI

B

R

A

T

ION

SL

OW

/N

O RETURN 

T

O

 I

D

L

E

OVERHEA

T

S/W

A

T

E

R TEMPERA

T

URE 

HI

GH

EXCESSIVE FUEL CO

NSUM

P

T

ION

EXCESSIVE O

IL CONSUM

P

T

IO

N

BA

TTER

Y

 DEA

D

 (UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

AM

HA

Fuel

Fuel tank

5

5

FL-10

Fuel piping

5

5

5

5

5

5

EM-47

Vapor lock

—

Valve deposit

5

5

5

5

5

5

5

—

Poor fuel (Heavy weight gaso-
line, Low octane)

—

Air

Air duct

5

5

5

5

5

5

EM-19

Air cleaner

EM-19

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

5

5

5

5

EM-19

Electric throttle control actuator

EM-21

Air leakage from intake manifold/
Collector/Gasket

EM-26

Cranking

Battery

1

1

1

1

1

1

1

1

SC-4

Generator circuit

SC-20

Starter circuit

3

SC-8

Signal plate

6

EM-124

PNP switch

4

AT-113

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-102

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-124

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-66

Camshaft

EM-85

Intake valve timing control

EM-66

Intake valve

3

EM-85

Exhaust valve

EC-102

[VQ35DE]

TROUBLE DIAGNOSIS

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-28

, 

EX-

3

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-31

, 

LU-

19

 , 

LU-11

 , 

LU-15

Oil level (Low)/Filthy oil

LU-7

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-14

, 

CO-18

Thermostat

5

CO-29

Water pump

CO-24

Water gallery

CO-31

Cooling fan

5

CO-22

Coolant level (Low)/Contami-
nated coolant

CO-11

IVIS (INFINITI Vehicle Immobilizer System — 
NATS)

1

1

EC-53

 or 

BL-244

SYMPTOM

Reference 
page

HARD/

NO ST

AR

T

/REST

AR

T (

EXCP

. H

A

)

ENGI

NE ST

ALL

HESI

T

A

TION/

S

URGING/

FL

A

T

 SPOT

SP

ARK KNOCK/DET

O

NA

TI

ON

L

A

CK OF 

POW

E

R/POO

R

 ACCEL

E

RA

TION

HI

GH I

D

L

E

/L

OW

 I

D

L

E

ROUG

H IDL

E

/HUNTING

ID

L

ING VI

BRA

T

ION

SL

OW

/N

O RETURN 

T

O

 I

D

L

E

OVERHEA

T

S/

W

A

TER TEMPERA

T

URE HI

GH

EXCESSIVE F

U

E

L

 CONSUM

P

T

IO

N

EXCESSIVE OIL 

CONSUM

P

T

ION

BA

TTER

Y

 DEAD (

UNDER CHARGE)

Warranty symptom code

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

AM

HA

TROUBLE DIAGNOSIS

EC-103

[VQ35DE]

C

D

E

F

G

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J

K

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M

A

EC

Engine Control Component Parts Location

NBS004T2

1.

IPDM E/R

2.

ICC brake hold relay
(ICC models only)

3.

Battery current sensor

4.

Cooling fan relay

5.

Power steering pressure sensor

6.

Refrigerant pressure sensor

7.

Intake valve timing control solenoid 
valve (bank 1)

8.

Cooling fan motor-2

9.

Cooling fan control module

10. Intake valve timing control solenoid 

valve (bank 2)

11.

Cooling fan motor-1

12. Mass air flow sensor

(with built in intake air temperature 
sensor)

13. Ignition coil (with power transistor) 

and spark plug (bank 2)

14. Camshaft position sensor (PHASE) 

(Bank 2)

15. Electric throttle control actuator

(with built in throttle position sensor, 
throttle control motor)

16. Fuel injector (bank 2)

17. Knock sensor

18. Fuel injector (bank 1)

19. EVAP canister purge volume con-

trol solenoid valve

20. Camshaft position sensor (PHASE) 

(Bank 1)

21. Engine coolant temperature sensor

22. Ignition coil (with power transistor) 

and spark plug (bank 1)

23. EVAP service port

PBIB2781E

EC-104

[VQ35DE]

TROUBLE DIAGNOSIS

: Vehicle front

1.

Mass air flow sensor
(with built in intake air temperature 
sensor)

2.

Electric throttle control actuator
(with built in throttle position sensor, 
throttle control motor)

3.

Cooling fan motor-1

4.

Cooling fan motor-2

5.

Cooling fan control module

6.

Refrigerant pressure sensor har-
ness connector

7.

PCV valve

8.

Engine coolant temperature sensor 
harness connector

9.

Fuel dumper

PBIB3351E