Infiniti FX35, FX50 (S51). Manual - part 753

ECM

EC-553

< ECU DIAGNOSIS INFORMATION >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

MISFIRE

A2H

No. 1 Cylinder Misfire

P0301

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0301

0CH

24H

Misfire counts for last/current driving cy-
cles

A3H

No. 2 Cylinder Misfire

P0302

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0302

0CH

24H

Misfire counts for last/current driving cy-
cles

A4H

No. 3 Cylinder Misfire

P0303

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0303

0CH

24H

Misfire counts for last/current driving cy-
cles

A5H

No. 4 Cylinder Misfire

P0304

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0304

0CH

24H

Misfire counts for last/current driving cy-
cles

A6H

No. 5 Cylinder Misfire

P0305

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0305

0CH

24H

Misfire counts for last/current driving cy-
cles

A7H

No. 6 Cylinder Misfire

P0306

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0306

0CH

24H

Misfire counts for last/current driving cy-
cles

A8H

No. 7 Cylinder Misfire

P0307

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0307

0CH

24H

Misfire counts for last/current driving cy-
cles

A9H

No. 8 Cylinder Misfire

P0308

0BH

24H

EWMA (Exponential Weighted Moving 
Average) misfire counts for last 10 driv-
ing cycles

P0308

0CH

24H

Misfire counts for last/current driving cy-
cles

Item

OBD-

MID

Self-diagnostic test item

DTC

Test value and Test 

limit

(GST display)

Description

TID

Unit and 

Scaling 

ID

EC-554

< SYMPTOM DIAGNOSIS >

[VQ35HR]

ENGINE CONTROL SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

ENGINE CONTROL SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000005237127

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-473

Fuel  pressure  regulator  system

3

3

4

4

4

4

4

4

4

4

EC-566

Fuel  injector  circuit

1

1

2

3

2

2

2

2

EC-470

Evaporative  emission  system

3

3

4

4

4

4

4

4

4

4

EC-84

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-492

Incorrect idle speed adjustment

1

1

1

1

1

EC-20

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-381

, 

EC-388

Ignition

Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-20

Ignition  circuit

1

1

2

2

2

2

2

2

EC-480

Main  power  supply  and  ground  circuit

2

2

3

3

3

3

3

2

3

EC-142

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-168

, 

EC-175

Engine coolant temperature sensor circuit

3

3

3

EC-186

, 

EC-193

Air fuel ratio (A/F) sensor 1 circuit

EC-200

, 

EC-204

, 

EC-207

, 

EC-210

, 

EC-456

Throttle position sensor circuit

2

2

EC-189

, 

EC-255

, 

EC-377

, 

EC-379

, 

EC-390

Accelerator pedal position sensor circuit

3

2

1

EC-442

, 

EC-446

, 

EC-451

Knock sensor circuit

2

3

EC-265

ENGINE CONTROL SYSTEM SYMPTOMS

EC-555

< 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 figure)

SYSTEM — ENGINE MECHANICAL & OTHER

Engine oil temperature sensor

4

2

3

EC-249

, 

EC-252

Crankshaft position sensor circuit

2

2

EC-268

Camshaft position sensor circuit

3

2

EC-273

Vehicle speed signal circuit

2

3

3

3

EC-345

Power steering pressure sensor circuit

2

3

3

EC-351

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-354

, 

EC-356

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-162

Exhaust valve timing control magnet retarder 
circuit

3

2

1

3

2

2

3

3

EC-165

PNP signal circuit

3

3

3

3

3

EC-362

Refrigerant pressure sensor circuit

2

3

3

4

EC-494

Electrical load signal circuit

3

EC-468

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

HA-4

ABS actuator and electric unit (control unit)

4

BRC-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

EC-556

< 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-15

Fuel  piping

5

5

5

5

5

5

EM-45

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-30

Air cleaner

EM-30

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

5

5

5

5

EM-30

Electric throttle control actuator

EM-31

Air leakage from intake manifold/
Collector/Gasket

EM-35

Cranking

Battery

1

1

1

1

1

1

1

1

PG-161

Generator circuit

CHG-26

, 

CHG-27

Starter circuit

3

STR-21

Signal plate

6

EM-126

PNP signal

4

TM-71

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-114

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-126

Piston

Piston ring

Connecting rod

Bearing

Crankshaft