Nissan Altima L32. Manual - part 477

ENGINE CONTROL SYSTEM SYMPTOMS

EC-1029

< SYMPTOM DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

N

TING

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

A
A

AB

AC

AD

AE

AF

AG AH

AJ

AK

AL

AM HA

Fuel

Fuel tank

5

5

FL-10

Fuel piping

5

5

5

5

5

5

EM-36

Vapor lock

—

Valve deposit

5

5

5

5

5

5

5

—

Poor fuel (Heavy weight gas-
oline, Low octane)

—

Air

Air duct

5

5

5

5

5

5

EM-25

Air cleaner

Air leakage from air duct
(Mass air flow sensor — elec-
tric throttle control actuator)

5

5

5

5

Electric throttle control actua-
tor

EM-26

Air leakage from intake mani-
fold/Collector/Gasket

Cranking

Battery

1

1

1

1

1

1

1

1

PG-68

 (Coupe)

PG-139

 (Sedan)

Generator circuit

CHG-5

Starter circuit

3

STR-6

Signal plate

6

EM-76

PNP switch

4

TM-20

  (M/T)

TM-307

 (CVT)

Engine

Cylinder head

5

5

5

5

5

5

5

5

EM-68

Cylinder head gasket

4

3

Cylinder block

6

6

6

6

6

6

6

6

4

EM-76

Piston

Piston ring

Connecting rod

Bearing

Crankshaft

EC-1030

< SYMPTOM DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ENGINE CONTROL SYSTEM SYMPTOMS

1 - 6: The numbers refer to the order of inspection.

Valve 
mecha-
nism

Timing chain

5

5

5

5

5

5

5

5

EM-52

Camshaft

EM-41

Intake valve timing control

EM-52

Intake valve

3

EM-68

Exhaust valve

Exhaust

Exhaust manifold/Tube/Muf-
fler/Gasket

5

5

5

5

5

5

5

5

EM-30

, 

EX-6

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-32

, 

LU-12

, 

LU-11

, 

LU-7

, 

LU-15

Oil level (Low)/Filthy oil

LU-9

Cooling

Radiator/Hose/Radiator filler 
cap

5

5

5

5

5

5

5

4

5

CO-15

Thermostat

5

CO-21

Water pump

CO-19

Water gallery

CO-7

Cooling fan

5

CO-17

Coolant level (Low)/Contami-
nated coolant

CO-11

NVIS (NISSAN Vehicle Immobilizer Sys-
tem — NATS)

1

1

SEC-22

 

(Coupe)

SEC-221

 (Se-

dan)

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

X

CESSIVE

 FUEL CON

S

UMP

T

ION

E

X

CESSIVE

 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

NORMAL OPERATING CONDITION

EC-1031

< SYMPTOM DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NORMAL OPERATING CONDITION

Description

INFOID:0000000004349982

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

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

engine speed is over 1,800 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 1,500 rpm, then fuel cut will be cancelled.

NOTE:

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

EC-577,

"System Description"

.

EC-1032

< PRECAUTION >

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PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000004351816

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SR and SB section of this Service Man-

ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

Precaution for Procedure without Cowl Top Cover

INFOID:0000000004351815

When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc. 

On Board Diagnostic (OBD) System of Engine and CVT

INFOID:0000000004349986

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the

driver of a malfunction causing emission deterioration.

CAUTION:

• Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any repair

or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will

cause the MIL to light up.

• Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will

cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,

dirt, bent terminals, etc.)

• Certain systems and components, especially those related to OBD, may use a new style slide-lock-

ing type harness connector. For description and how to disconnect, refer to 

PG-58, "Description"

(coupe) or 

PG-129, "Description"

 (sedan).

• Be sure to route and secure the harnesses properly after work. The interference of the harness with

a bracket, etc. may cause the MIL to light up due to the short circuit.

• Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube

may cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system,

etc.

• Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and

TCM (Transmission control module) before returning the vehicle to the customer.

PIIB3706J