Infiniti Q45. Manual — part 363

TROUBLE DIAGNOSIS

EC-91

C

D

E

F

G

H

I

J

K

L

M

A

EC

Symptom Matrix Chart

NBS001R2

SYSTEM — BASIC ENGINE CONTROL SYSTEM

SYMPTOM

Reference
page

HARD/NO ST

AR

T/REST

AR

T

(

EXCP

.

HA)

ENGINE ST

AL

L

HESIT

A

TI

ON/SURGI

N

G/FL

A

T SPOT

SP

ARK KNOCK/

DET

O

NA

TION

L

A

CK OF POW

E

R/POOR

A

C

CE

L

E

RA

TI

ON

HIGH IDL

E

/L

OW

IDL

E

ROUGH IDL

E

/HUNTIN

G

IDLING

VIBRA

T

IO

N

SL

OW

/NO

RETURN T

O

IDL

E

OVERHEA

T

S/W

A

TER T

E

M

P

ERA

T

U

R

E

HIGH

EXCESSIVE FUEL CONSUM

P

T

ION

EXCESSIVE OI

L

CONSUM

P

T

IO

N

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-715

,

EC-534

Fuel pressure regulator system

3

3

4

4

4

4

4

4

4

4

EC-80

Fuel injector circuit

1

1

2

3

2

2

2

2

EC-706

Evaporative emission system

3

3

4

4

4

4

4

4

4

4

EC-32

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-44

Incorrect idle speed adjustment

1

1

1

1

1

EC-71

Electric throttle control actuator

1

1

2

3

3

2

2

2

2

2

2

EC-633

,

EC-645

Ignition

Incorrect ignition timing adjustment

3

3

1

1

1

1

1

1

EC-71

Ignition circuit

1

1

2

2

2

2

2

2

EC-731

Main power supply and ground circuit

2

2

3

3

3

3

3

2

3

EC-146

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-195

,

EC-204

Engine coolant temperature sensor circuit

3

3

3

EC-215

,

EC-228

A/F sensor 1 circuit

EC-236

,

EC-246

,

EC-255

,

EC-264

,

EC-676

Throttle position sensor circuit

2

2

EC-221

,

EC-348

,

EC-542

,

EC-544

,

EC-661

Accelerator pedal position sensor circuit

3

2

1

EC-492

,

EC-647

,

EC-654

,

EC-668

Knock sensor circuit

2

3

EC-365

Crankshaft position sensor (POS) circuit

2

2

EC-370

Camshaft position sensor (PHASE) circuit

3

2

EC-379

Vehicle speed signal circuit

2

3

3

3

EC-474

EC-92

TROUBLE DIAGNOSIS

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

Power steering pressure sensor circuit

2

3

3

EC-480

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-485

,

EC-489

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-188

PNP switch circuit

3

3

3

3

3

EC-497

Refrigerant pressure sensor circuit

2

3

3

4

EC-744

Electrical load signal circuit

3

EC-698

Air conditioner circuit

2

2

3

3

3

3

3

3

3

3

2

ATC-35

VIAS control solenoid valve circuit

1

EC-617

VDC/TCS/ABS control unit

4

BRC-10

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-93

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-8

Fuel piping

5

5

5

5

5

5

FL-2

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-17

Air cleaner

EM-17

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

5

5

5

5

EM-17

Electric throttle control actuator

EM-19

Air leakage from intake manifold/
Collector/Gasket

EM-19

Cranking

Battery

1

1

1

1

1

1

1

1

SC-4

Generator circuit

SC-16

Starter circuit

3

SC-9

Signal plate

6

EM-83

PNP switch

4

AT-107

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-67

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-83

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-39

Camshaft

EM-50

Intake valve timing control

EM-39

Intake valve

3

EM-67

Exhaust valve

EC-94

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-23

,

EX-

3

Three way catalyst

Lubrica-
tion

Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery

5

5

5

5

5

5

5

5

EM-26

,

LU-

10

,

LU-9

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-14

Thermostat

5

CO-22

Water pump

CO-20

Water gallery

CO-6

Cooling fan

5

CO-18

Coolant level (Low)/Contami-
nated coolant

CO-8

IVIS (INFINITI Vehicle Immobilizer System —
NATS)

1

1

EC-46

or

BL-200

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