Infiniti F50. Manual - part 362

TROUBLE DIAGNOSIS

EC-89

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

ONA

T

IO

N

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

NG

ID

L

ING VI

B

R

A

T

ION

SL

OW

/N

O RETURN 

T

O

 I

D

L

E

OVERHEA

TS/W

A

T

ER TEMPERA

TURE 

HI

GH

EXCESSIVE FUEL CO

NSUMP

T

ION

EXCESSIVE O

IL CONSUMP

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-9

Fuel piping

5

5

5

5

5

5

FL-2

, 

MA-

16

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-15

Air cleaner

EM-15

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

5

5

5

5

EM-15

Electric throttle control actuator, 
Throttle wire

EM-17

, 

ACC-2

Air leakage from intake manifold/
Collector/Gasket

EM-17

Cranking

Battery

1

1

1

1

1

1

1

1

SC-4

Generator circuit

SC-9

Starter circuit

3

SC-22

Drive plate

6

EM-73

PNP switch

4

AT-102

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-61

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-73

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

EC-90

TROUBLE DIAGNOSIS

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

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-35

Camshaft

EM-46

Intake valve timing control

EM-35

Intake valve

5

5

5

5

5

5

5

5

3

EM-61

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-17

, 

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-25

, 

LU-

9

 , 

LU-8

Oil level (Low)/Filthy oil

LU-6

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-12

Thermostat

5

CO-24

Water pump

CO-22

Water gallery

CO-7

Cooling fan

5

CO-18

Coolant level (Low)/Contami-
nated coolant

CO-9

IVIS (INFINITI Vehicle Immobilizer System — 
NATS)

1

1

EC-65

,  

BL-198

SYMPTOM

Reference 
page

HARD/

NO ST

AR

T

/REST

AR

T (

EXCP

. H

A

)

ENGI

NE ST

ALL

HESI

T

A

TION/

SURGING/

FL

A

T

 SPOT

SP

ARK KNOCK/DET

ONA

T

IO

N

L

A

CK OF 

POW

ER/POO

R ACCEL

ERA

TION

HI

GH I

D

L

E

/L

OW

 I

D

L

E

ROUG

H IDL

E/

HUNTING

ID

L

ING VI

BRA

TION

SL

OW

/N

O RETURN 

T

O

 I

D

L

E

OVERHEA

TS/

W

A

TER TEMPERA

TURE HI

GH

EXCESSIVE F

U

E

L

 CONSUMP

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-91

C

D

E

F

G

H

I

J

K

L

M

A

EC

Engine Control Component Parts Location

EBS00LW0

PBIB1244E

EC-92

TROUBLE DIAGNOSIS

PBIB1258E