1995 NISSAN ALMERA N15 Service Manual

ENGINEANDEMISSION CONTROL OVERALLSYSTEM
ECCS Component PartsLocation -GA15DE
Distributor withbuilt-in camshaft position
sensor, powertransistor andignition coil
EGR
valve
&
EVAP canister purgecontrol solenoid valve
(Only M/Tmodels)

f
EGR valve (Only M/Tmodels)
Fuel filter
EVAPcanister
Oxygen sensor
Mass
airflow sensor
IACV-AAC valve
(with FICD
solenoid valve)
Throttle
position sensor
Engine coolant temperature
sensor
Massairflow sensor
Throttleposition sensor
SEF123R
EC-18

ENGINEANDEMISSION CONTROLOVERALLSYSTEM
ECCS Component PartsLocation -GA16DE
except forEurope, IsraelandAustralia
Throttle position sensor
Engine coolant
temperature sensor
Power steering oil

,,,,,"to
'WI"h~~>- __
"7-_

VTC solenoid valve EVAP
canister purge
control solenoid valve
(Only M/Tmodels)
Oxygen sensor
•

Engine coolant temperature sensor
VTC solenoid valve
EC-19 Throttle
position sensor
SEF451QA

ENGINEANDEMISSION CONTROL OVERALLSYSTEM
ECCS Component PartsLocation -GA16DE for
Australia
Heated oxygen sensor

(AfT
models)
Oxygen sensor

(MfT
models)
Engine
coolant temperature
sensor
VTCsolenoid valve EGR
valve
&
EVAP
canister purge
control solenoid valve Throttle
position sensor
IACV-AAC valve(withFICO solenoid valve)
Distributor withbuilt-in camshaft position
sensor, powertransistor andignition coil
Engine coolant temperature sensor
VTC solenoid valve
Throttlepositionsensor
SEF124R
EC-20

ENGINEANDEMISSION CONTROLOVERALLSYSTEM
[]K]

ECCS Component PartsLocation

Behind thecenter console

•

SEF452Q
EC-21

ENGINEANDEMISSION CONTROLOVERALLSYSTEM
Vacuum HoseDrawing
GA 14DE, GA16DE forEurope
GA15DE
Pressureregulator ~.

"

Throttle body
\1--"

10 ~

EGR valve
~L/

~1 ~
t~:::-
EGRvalve
&
EVAP

z:
0
5
I
L
W
canister purge

4
controlsolenoid
8 ToEVAP canister
¥
valve
EGR valve &EVAP canister purge BPTvalve 3-wayconnector
control solenoid valve

MIT
models
AIT
models

AIT
models
SEF125R

(1)
Pressure regulator tointake
manifold
@ EGR valve to3-way connector
@ 3-way connector to3-way con-
nector
@ BPTvalve to3-way connector

@
3-way connector toEVAP canis-
ter
@ EGR valve
&
EVAP canister
purge control solenoid valveto
3-way connector
(j)

EGR valve
&
EVAP canister
purge control solenoid valveto
air cleaner
@ EGRvalve
&
EVAP canister
purge control solenoid valveto
throttle body

@
Pressure regulator tothrottle
body

@l
EGR valve
&
EV AP canister
purge control solenoid valveto
air duct

EC-22 @

Throttle bodytoEVAP canister
@ EVAP canister purgecontrol
valve tothrottle body
@ EVAP canister purgecontrol
valve toEVAP canister
@ EVAP canister purgecontrol
valve toresonator

@
Throttle bodytoEVAP canister

ENGINEANDEMISSION BASICCONTROL SYSTEMDESCRIPTION
System Chart

I
Camshaft positionsensor

'1
Fuel
injection
&
mixture
ratio control Injectors
Knock sensor
Distributorignitionsystem Powertransistor
Mass airflow sensor
Engine coolant temperature
sensor
Ignition switch Idle
aircontrol system
Fuel pump control
*4

IACV-AAC valve(WithFICD
solenoid valve)
Fuel pump relay

•

'5

Throttle
positionsensor
Neutral positionllnhibitor
switch
Air conditioner switch ECM
(ECCS
control
module)
2

Oxygen sensormonitor

&
On-board diagnostic system

5
Torque converter clutchcan-
cel solenoid valvecontrol
(A/T models) Malfunction
indicatorlamp
(On theinstrument panel)
Torque converter clutchsole-
noid valve
VTC solenoid valve

*6
Air
conditioner relays
Cooling
fanrelay
EVAP canister purgecontrol
solenoid valve
Cooling
fancontrol
Air conditioner cutcontrol
during acceleration
Valve timing control
EVAP canister purgecontrol

7

6

Power
steering oilpressure
switch Battery
voltage
Intake airtemperature sensor

*3

I

Vehicle speedsensor

*2

I
Oxygen sensor

8
'8

Electrical load
• Rear defogger switch
• Lighting switch EGR

&
EVAP canister purge
control EGR
valve
&
EVAP canister
purge control solenoid valve
*1: Except forEurope andIsrael
*2: Heated oxygen sensor(ForEurope andIsrael, andAustralia A/Tmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia A/Tmodels)
*3: For Australia
*4: IACV-AAC valveandIACV-FICD solenoidvalve(ForEurope andIsrael)
IACV-AAC valve(withFICDsolenoid valve)(Except forEurope andIsrael)
'5: Except forEurope
*6: GA16DE exceptforEurope andIsrael
*7: GA16DE MITmodels exceptforEurope, IsraelandAustralia
*8: For Europe andIsrael andAustralia, andGA15DE MITmodels

EC-23

ENGINEANDEMISSION BASICCONTROL SYSTEMDESCRIPTION
Multipart FuelInjection (MFI)System
INPUT/OUTPUT SIGNALLINE

Camshaft positionsensor
Mass airflow sensor
Engine coolant temperature sensor

*1
Oxygen sensor
Throttle position sensor
Neutral position/Inhibitor switch
Vehicle speedsensor
~gnition switch
Air conditioner switch
Power steering oilpressure switch
Battery Engine
speedandpiston position
Amount ofintake air
Engine coolant temperature
Density ofoxygen inexhaust gas
Throttle position
Throttle valveidleposition
Gear position
Vehicle speed
Start signal
Air conditioner operation
Power steering loadsignal
Battery voltage ECM
(ECCS
control module) Injector
*1: Heated oxygen sensor(ForEurope andIsrael, andAustralia A/Tmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia A/Tmodels)

BASIC MULTIPORT FUELINJECTION
SYSTEM

The amount offuel injected fromthefuel injector
is determined bythe ECM. TheECM controls the
length oftime thevalve remains open(injection
pulse duration). Theamount offuel injected isa
program valueinthe ECM memory. Theprogram
value ispreset byengine operating conditions.
These conditions aredetermined byinput signals
(for engine speedandintake air)from boththe
camshaft positionsensorandthemass airflow
sensor.
VARIOUS
FUELINJECTION
INCREASE/DECREASE COMPENSATION

In addition, theamount offuel injected iscom-
pensated toimprove engineperformance under
various operating conditions aslisted below.

<
Fuel increase>
• During warm-up
• When starting theengine
• During acceleration
• Hot-engine operation
• When selector leverischanged from"N"to
"D"
(AfT
models only)
• High-load, high-speed operation

<
Fuel decrease>
• During deceleration

EC-24

•

OPEN
LOOPCONTROL

The open loopsystem condition referstowhen theECM detects
any ofthe following conditions. Feedbackcontrolstopsinorder
to maintain stabilized fuelcombustion.
• Deceleration andacceleration
• High-load, high-speed operation
• Engine idling
• Malfunction ofoxygen sensor*1 orits circuit
• Insufficient activationofoxygen sensor*1 atlow engine
coolant temperature
• High-engine coolanttemperature
• After shifting from"N"to"D"
• During warm-up
• When starting theengine

ENGINE
ANDEMISSION BASICCONTROL SYSTEMDESCRIPTION
[ill

Multipart FuelInjection (MFI)System (Cant'd)
MIXTURE RATIOFEEDBACK CONTROL(CLOSEDLOOP
CONTROL)

The mixture ratiofeedback systemprovides thebest air-fuel
mixture ratiofordriveability andemission control.Thethree
way catalyst canthen better reduce CO,HCand NOx emissions.
This system usesanoxygen sensor*1 inthe exhaust manifold
to monitor ifthe engine operation isrich orlean. TheECM
adjusts theinjection pulsewidthaccording tothe sensor volt-
age signal. Thismaintains themixture ratiowithin therange of
stoichiometric (idealair-fuel mixture).

MEF025DC
Thisstage isreferred toas the closed loopcontrol condition .

Feedback
signal
CLOSED
LOOP
CONTROL
MIXTURERATIOSELF-LEARNING CONTROL

The mixture ratiofeedback controlsystem monitors themixture
ratio signal transmitted fromtheoxygen sensor*1. Thisfeed-
back signal isthen senttothe ECM. TheECM controls thebasic
mixture ratioasclose tothe theoretical mixtureratioaspossi-
ble. However, thebasic mixture ratioisnot necessarily con-
trolled asoriginally designed. Bothmanufacturing differences
(i.e., mass airflow sensor hotfilm) andcharacteristic changes
during operation (i.e.,injector clogging) directlyaffectmixture
ratio.
Accordingly, thedifference betweenthebasic andtheoretical
mixture ratiosismonitored inthis system. Thisisthen com-
puted interms of"injection pulseduration" toautomatically
compensate forthe difference betweenthetwo ratios.
* 1: Heated oxygen sensor(ForEurope andIsrael, andAustra-
lia AIT models)
Oxygen sensor(Except forEurope andIsrael, andAustralia

AIT
models)

EC-25