Infiniti F50. Manual - part 361

TROUBLE DIAGNOSIS

EC-85

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EC

10. 

CHECK IGNITION TIMING

1.

Run engine at idle.

2.

Check ignition timing with a timing light.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 11.

11. 

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1.

Stop engine.

2.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

>> GO TO 12.

12. 

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

>> GO TO 13.

13. 

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-46, "Idle Air Volume Learning"

 .

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

>> GO TO 14.

No

>> 1. Follow the instruction of “Idle Air Volume Learning”.

2. GO TO 4.

14. 

CHECK TARGET IDLE SPEED AGAIN

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Read idle speed in “DATA MONITOR” mode with CONSULT-II.

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Check idle speed.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 17.

12 

±

 5

°

 BTDC (in “P” or “N” position)

PBIB1242E

650 

±

 50 rpm (in “P” or “N” position)

650 

±

 50 rpm (in “P” or “N” position)

SEF058Y

EC-86

TROUBLE DIAGNOSIS

15. 

CHECK IGNITION TIMING AGAIN

1.

Run engine at idle.

2.

Check ignition timing with a timing light.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 16.

16. 

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to 

EM-35, "TIMING CHAIN"

 .

OK or NG

OK

>> GO TO 17.

NG

>> 1. Repair the timing chain installation.

2. GO TO 4.

17. 

DETECT MALFUNCTIONING PART

Check the following.

●

Check camshaft position sensor (PHASE) and circuit. Refer to 

EC-315

 .

●

Check crankshaft position sensor (POS) and circuit. Refer to 

EC-307

 .

OK or NG

OK

>> GO TO 18.

NG

>> 1. Repair or replace.

2. GO TO 4.

18. 

CHECK ECM FUNCTION 

1.

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is a rare case.)

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-200, "ECM Re-communicating Function"

 .

>> GO TO 4.

12 

±

 5

°

 BTDC (in “P” or “N” position)

PBIB1242E

TROUBLE DIAGNOSIS

EC-87

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EC

Symptom Matrix Chart

EBS00LVZ

SYSTEM — BASIC ENGINE CONTROL SYSTEM

SYMPTOM

Reference 
page

HARD/NO ST

AR

T/REST

AR

T

 (EXCP

. 

HA)

ENGINE ST

AL

L

HESIT

A

T

ION/SURGI

NG/FLA

T

 SPOT

SP

ARK KNOCK/

DET

ONA

TION

L

A

CK OF POW

ER/POOR 

A

C

CE

L

E

RA

TI

ON

HIGH IDL

E/L

O

W

 IDL

E

ROUGH IDL

E/HUNTIN

G

IDLING

 VIBRA

TI

ON

SL

OW

/NO

 RETURN T

O

 IDL

E

OVERHEA

TS/W

A

TER T

E

M

P

ERA

T

U

RE 

HIGH

EXCESSIVE FUEL CONSUM

P

T

ION

EXCESSIVE OI

L

 CONSUMP

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-513

, 

EC-666

Fuel pressure regulator system

3

3

4

4

4

4

4

4

4

4

EC-48

Injector  circuit

1

1

2

3

2

2

2

2

EC-653

Evaporative emission system

3

3

4

4

4

4

4

4

4

4

EC-684

Air

Positive crankcase ventilation sys-
tem

3

3

4

4

4

4

4

4

4

4

1

EC-696

Incorrect idle speed adjustment

1

1

1

1

1

EC-82

Electric  throttle  control  actuator

1

1

2

3

3

2

2

2

2

2

2

EC-435

, 

EC-437

Ignition

Incorrect  ignition  timing  adjustment

3

3

1

1

1

1

1

1

EC-82

Ignition signal circuit

1

1

2

2

2

2

2

2

EC-641

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-171

, 

EC-179

 , 

EC-418

Engine coolant temperature sensor circuit

3

3

3

EC-190

, 

EC-201

Heated oxygen sensor 1 circuit

EC-212

, 

EC-221

 , 

EC-233

 , 

EC-463

 , 

EC-469

Throttle position sensor circuit

2

2

EC-195

, 

EC-291

 , 

EC-521

 , 

EC-523

 , 

EC-619

Accelerator pedal position sensor circuit

3

2

1

EC-607

, 

EC-613

 , 

EC-626

Knock sensor circuit

2

3

EC-303

Crankshaft position sensor (POS) circuit

2

2

EC-307

Camshaft position sensor (PHASE) circuit

3

2

EC-315

Vehicle speed signal circuit

2

3

3

3

EC-395

EC-88

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-401

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-407

, 

EC-414

Intake valve timing control solenoid valve cir-
cuit

3

3

2

1

3

2

2

3

3

EC-424

PNP switch circuit

3

3

3

3

3

EC-592

Start signal circuit

2

EC-662

Refrigerant pressure sensor circuit

2

3

3

4

EC-672

Electrical load signal circuit

3

3

EC-677

Air  conditioner  circuit

2

2

3

3

3

3

3

3

3

3

2

ATC-35

Radiator coolant temperature sensor circuit

EC-430

Cooling fan speed control solenoid valve cir-
cuit

EC-571

VIAS control solenoid valve circuit

1

EC-633

VDC/TCS/ABS control unit

4

EC-502

, 

EC-503

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