Nissan Titan. Manual — part 296

ENGINE CONTROL SYSTEM SYMPTOMS

EC-485

< SYMPTOM DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Mass air flow sensor circuit

1

1

2

2

2

2

2

2

EC-172

,

EC-176

Engine coolant temperature sensor circuit

3

3

3

EC-189

,

EC-197

Air fuel ratio (A/F) sensor 1 circuit

EC-205

,

EC-209

,

EC-212

,

EC-215

,

EC-420

Throttle position sensor circuit

2

2

EC-193

,

EC-258

,

EC-386

,

EC-388

,

EC-444

Accelerator pedal position sensor circuit

3

2

1

EC-365

,

EC-437

,

EC-440

,

EC-448

Knock sensor circuit

2

3

EC-269

Crankshaft position sensor (POS) circuit

2

2

EC-272

Camshaft position sensor (PHASE) circuit

3

2

EC-276

Vehicle speed signal circuit

2

3

3

3

EC-347

Power steering pressure sensor circuit

2

3

3

EC-355

ECM

2

2

3

3

3

3

3

3

3

3

3

EC-358

,

EC-359

,

EC-360

,

EC-361

,

EC-362

,

EC-363

,

EC-364

Intake valve timing control solenoid valve cir-
cuit

3

2

1

3

2

2

3

3

EC-169

Park/neutral position (PNP) signal circuit

3

3

3

3

3

EC-368

Refrigerant pressure sensor circuit

2

3

3

4

EC-481

Electrical load signal circuit

3

EC-457

Air conditioner circuit

2

2

3

3

3

3

3

3

3

3

2

HAC-17

or

HAC-111

ABS actuator and electric unit (control unit)

4

BRC-24

SYMPTOM

Refer-
ence page

HARD/NO S

TA

R

T/RES

TA

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

LOW/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-486

< SYMPTOM DIAGNOSIS >

[VK56DE]

ENGINE CONTROL SYSTEM SYMPTOMS

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

SYSTEM — ENGINE MECHANICAL & OTHER

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

LA

CK OF POWE

R

/POOR

ACCELERA

TION

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 OIL CONSUMP

T

IO

N

BA

TTER

Y

DEAD (UN

D

ER 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-6

Fuel piping

5

5

5

5

5

5

FL-5

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-26

Air cleaner

EM-16

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

5

5

5

5

EM-26

Electric throttle control actuator

EM-26

Air leakage from intake manifold/
Collector/Gasket

EM-26

Cranking

Battery

1

1

1

1

1

1

1

1

PG-80

Generator circuit

CHG-28

Starter circuit

3

STR-19

Signal plate

6

EM-101

Park/neutral position (PNP) sig-
nal

4

TM-53

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-78

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-101

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

ENGINE CONTROL SYSTEM SYMPTOMS

EC-487

< SYMPTOM DIAGNOSIS >

[VK56DE]

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.

Valve
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-56

Camshaft

EM-62

Intake valve timing control

EM-62

Intake valve

3

EM-78

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EM-32

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

LU-11

,

LU-

14

,

LU-14

,

LU-12

Oil level (Low)/Filthy oil

LU-8

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

4

5

CO-14

Thermostat

5

CO-22

Water pump

CO-20

Water gallery

CO-6

Cooling fan

5

CO-18

Coolant level (Low)/Contaminat-
ed coolant

5

CO-10

NVIS (NISSAN Vehicle Immobilizer System —
NATS)

1

1

SEC-3

SYMPTOM

Reference
page

HARD/NO S

TA

R

T/RES

TA

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

LOW/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-488

< SYMPTOM DIAGNOSIS >

[VK56DE]

NORMAL OPERATING CONDITION

NORMAL OPERATING CONDITION

Fuel Cut Control (at No Load and High Engine Speed)

INFOID:0000000009886933

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine

speed over is 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies

based on engine speed.

Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under

EC-23, "System Description"

.

Sensor

Input signal to ECM

ECM function

Actuator

TCM

Neutral position

Fuel cut control Fuel injector

Accelerator pedal position sensor

Accelerator pedal position

Engine coolant temperature sensor

Engine coolant temperature

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Wheel sensor

Vehicle speed*