Nissan Sentra. Manual - part 445

EC-476

< SYMPTOM DIAGNOSIS >

[MRA8DE]

ENGINE CONTROL SYSTEM

Air

Air duct

5

5

5

5

5

5

EM-26

Air cleaner

EM-26

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

5

5

5

5

EM-26

Electric throttle control actuator

EM-27

Air leakage from intake manifold/
Collector/Gasket

Cranking

Battery

1

1

1

1

1

1

1

1

PG-4

Generator circuit

CHG-14

Starter circuit

3

STR-20

, 

STR-24

Signal plate

6

EM-103

PNP signal

4

TM-165

 

(CVT mod-

els),  

TM-

17

  (6MT 

models)

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-79

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-103

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-58

Camshaft

EM-64

Intake valve timing control

EC-181

Exhaust valve timing control

EC-184

Intake valve

3

EM-79

Exhaust valve

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

A
A

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

ENGINE CONTROL SYSTEM

EC-477

< SYMPTOM DIAGNOSIS >

[MRA8DE]

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.

Exhaust

Exhaust manifold/Tube/Muffler/
Gasket

5

5

5

5

5

5

5

5

EX-4

, 

EX-

7

, 

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

EM-35

, 

LU-

11

, 

LU-16

Oil level (Low)/Filthy oil

LU-7

Cooling

Radiator/Hose/Radiator filler cap

5

5

5

5

5

5

5

2

5

CO-16

Thermostat

5

CO-23

Water pump

CO-19

Water gallery

CO-6

Cooling fan

5

CO-17

Coolant level (Low)/Contaminat-
ed coolant

CO-11

NATS (Nissan Anti-Theft System)

1

1

SEC-58

 

(With intel-

ligent key 

system), 

SEC-171

 

(Without in-

telligent 

key sys-

tem)

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

A
A

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

EC-478

< SYMPTOM DIAGNOSIS >

[MRA8DE]

NORMAL OPERATING CONDITION

NORMAL OPERATING CONDITION

Description

INFOID:0000000009758732

FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED)

If the engine speed is above 2,500 rpm under no load (for example, the selector lever position is neutral and

engine speed is over 2,500 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-

ies based on engine speed.

Fuel cut will be operated until the engine speed reaches 2,000 rpm, then fuel cut will be cancelled.

NOTE:

This function is different from deceleration control listed under Multiport Fuel Injection System, 

EC-35, "MUL-

TIPORT FUEL INJECTION SYSTEM : System Description"

.

IDLE SPEED

EC-479

< PERIODIC MAINTENANCE >

[MRA8DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

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PERIODIC MAINTENANCE

IDLE SPEED

Inspection

INFOID:0000000009758733

1.

CHECK IDLE SPEED

With CONSULT

Check idle speed in “DATA MONITOR” mode of “ENGINE” using CONSULT.

With GST

Check idle speed with Service $01 of GST.

>> INSPECTION END

Specification

: 

EC-486, "Idle Speed"

Specification

: 

EC-486, "Idle Speed"