1995 NISSAN ALMERA N15 Throttle

•

Approximately
10kQ
Resistance
[at25'C (77'Fl)
Approximately 1kQ
1 -10 kQ

If
NG, replace throttleposition sensor.
To adjust it,perform "BasicInspection", EC-271.

Throttle
valveconditions
Completely closed
Partially open
Completely open
Throttle
position sensor

1. Disconnect throttleposition sensorharness connector.
2. Make surethatresistance betweenterminals
@
and
CID

changes whenopening throttlevalvemanually.

MEC7248
TROUBLE
DIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)
COMPONENT INSPECTION
EC-313

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Exhaust GasRecirculation (EGR)Valveand
EVAP Canister PurgeControl
SYSTEM DESCRIPTION

I
Camshaft positionsensor
I

Engine speed
EGRvalve

I
Mass
airflow sensor
I

Amount ofintake air ECM

&
EVAP
(ECCS canister

I
~Engine
coolanttemperature control
purgecon-
Engine coolant temperature sensor
module)trolsole-

I
noid
valve
Ignition switch
I

Start signal

I

This system cutsandcontrols vacuumappliedto
EGR valve andEVAP canister tosuit engine oper-
ating conditions. Thiscut-and-control operation
is accomplished throughtheECM andtheEGR
valve
&
EVAP canister purgecontrol solenoid
valve. WhentheECM detects anyofthe following
conditions, currentflowsthrough thesolenoid
valve. Thiscauses theport vacuum tobe dis-
charged intotheatmosphere. TheEGR valve and
EVAP canister remainclosed.
•

•

•
•
•

•
Low
engine coolant temperature
Engine starting
High-speed engineoperation
Engine idling
Excessively highengine coolant temperature
Mass airflow sensor malfunction
•

Exhaust pressure COMPONENT
DESCRIPTION
EGR valve

The EGR valve controls theamount ofexhaust gasrouted tothe
intake manifold. Vacuumisapplied tothe EGR valve in
response tothrottle valveopening. Thevacuum controls the
movement ofataper valve connected tothe vacuum diaphragm
in the EGR valve.

SEF783K EGRC-BPT valve

The EGRC-BPT valvemonitors exhaustpressure toactivate the
diaphragm, controllingthrottlebodyvacuum appliedtothe EGR
valve. Inother words, recirculated exhaustgasiscontrolled in
response topositioning ofthe EGR valve ortoengine operation.

SEF529K
~ Vacuumsignal
SEF240PE EGR
valve
&
EVAP canister purgecontrol solenoid valve

The EGR valve
&
EVAP canister purgecontrol solenoid valve
responds tosignals fromtheECM. When theECM sends anON
(ground) signal,thecoil inthe solenoid valveisenergized. A
plunger willthen move tocut the vacuum signal(fromthethrot-
tle body tothe EGR valve andEVAP canister purgevalve).
When theECM sends anOFF signal, thevacuum signalpasses
through thesolenoid valve.Thesignal thenreaches theEGR
valve andEVAP canister.

EC-319

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
SYSTEM DESCRIPTION Idle
AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve

Camshaft positionsensor Engine
speed

~

I

Amount ofintake air
Mass airflow sensor

I

Engine coolant temperature sensor Engine
coolant temperature
I
Ignition switch Start
signal

I

Throttle position sensor Throttle
"position

I
ECM
Inhibitor switch(A/Tmodels)/ Park/Neutral
position (ECCS
control
!
IACV-AAC valve
I

Neutral position switch(M/Tmodels)
module)
Air conditioner switch Air
conditioner operation
Power steering oilpressure switch Power
steering loadsignal

I
Battery Battery
voltage
Vehicle speedsensor Vehicle
speed
I

l
Cooling fan Cooling
fanoperation

I

This system automatically controlsengineidlespeed toaspecified level.Idlespeed iscontrolled
through fineadjustment ofthe amount ofair which bypasses thethrottle valveviaIACV-AAC valve.The
IACV-AAC valverepeats ON/OFF operation according tothe signal sentfrom theECM. Thecamshaft
position sensordetects theactual engine speedandsends asignal tothe ECM. TheECM thencontrols
the ON/OFF timeofthe IACV-AAC valvesothat engine speedcoincides withthetarget valuememo-
rized inECM. Thetarget engine speedisthe lowest speedatwhich theengine canoperate steadily.
The optimum valuestored inthe ECM isdetermined bytaking intoconsideration variousengine
conditions, suchasduring warmup,deceleration, andengine load(airconditioner, powersteering and
cooling fanoperation).

COMPONENTDESCRIPTION
IACV-AAC valve

The IACV-AAC valveismoved byON/OFF pulsesfromtheECM.
The longer theONpulse, thegreater theamount ofair that will
flow through thevalve. Themore airthat flows through the
valve, thehigher theidle speed.

Air SEF040E
EC-335
•

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS~
Torque Converter ClutchSolenoid Valve(Cont'd)
SYSTEM DESCRIPTION

Throttle position sensor Throttle
valveopening angle
Engine coolant temperature sensorEnginecoolant temperature ECM
(ECCS
control
module) Torque
converter
clutch solenoid
valve
Vehicle speedsensor Vehicle
speed

The
AfT
lock-up iscontrolled bythe ECM through
the torque converter clutchsolenoid valve.When
the ECM detects anyofthe following conditions,
the ECM switches thetorque converter clutch
solenoid valveOFFtoaccomplish lock-upopera-
tion. While thevehicle isinconditions otherthan
below, thetorque converter clutchsolenoid valve
is always settoON, relea'sing thelock-up oper-
ation. •
Throttle position isopen .
• Engine coolant temperature is70°C (158°F) or
more .
• Vehicle speedis58 kmfh (36MPH) ormore.

~i3~

II
ECM
E[CONNECTORII
DIAGNOSTIC
PROCEDURE

INSPECTION START
115

OK

INSPECTION END
CHECK
COMPONENT
(Torque converter clutch
solenoid valve).
Refer to"Electrical Com-
ponents Inspection" in
AT section.

If
NG, replace torque
converter clutchsolenoid
valve.
Check thefollowing.
• Harness connectors

@,
• 10A fuse
• Harness foropen or
short between torque
converter clutchsole-
noid valve andfuse
If NG, repair harness or
connectors.

NG
OK
OK
@
CHECK
CONTROL FUNCTION.

1. Jack updrive wheels.
2. Start engine andwarm itup suffi-
ciently.
3. Shift selector leverto"0" position.
4. Check voltage between ECMterminal

GID
andground underthefollowing
conditions.
Voltage: Accelerator pedalIsdepressed
[Vehicle speedisabove
58 km/h (36MPH).]
Battery voltage
Accelerator pedalisfully
released
Approximately OV

CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect torqueconverter clutch
solenoid valveharness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground.
Voltage: Batteryvoltage

-

MEC785B
MEC279BA

Ef

CONNECTOR
II

115

II

ECM
~~
ID
cf8~-H
EC-368

SERVICEDATAANDSPECIFICATIONS (SOS)
General Specifications

PRESSURE REGULATOR
Regulated pressure
kPa (bar, kg/cm
2,
psi) 299
(2.99, 3.05,43.4)
Idle speed'1
rpm
Inspection
andAdjustment
ENGINE COOLANT TEMPERATURE
SENSOR

Temperature
'c
('F) Resistancekn
20 (68) 2.1
-2.9

•

90
(194) 0.24-0.26
110 (230) 0.14-0.15
No-load'2
Air conditioner: ONGA
14DE, GA16DE forEurope and
Israel
AIT: 800:1:50
Models withdaytime lightsystem

MIT: 800:1:50

Models withoutdaytime lightsystem
M/T: 700:1:50
GA15DE
M/T: 630:1: 50
A/T: 750:1: 50
GA 16DE forAustralia
M/T: 675:1: 50
A/T: 800:1:50
GA16DE exceptforEurope andIsrael,
and Australia
M/T: 650:1:50
A/T: 800:1: 50
900 ormore
FUEL
PUMP

Resistance [at25'C (77'F)] n

IACV-AAC VALVE
Approximately
0.2-5
Ignition timing GA
14DE, GA16DE forEurope and
Israel andGA16DE except forAustralia
10':1:2' BTDC
GA15DE
6':1:2' BTDC
GA16DE forAustralia
8':1:2' BTDC Resistance
[at25'C (77'F)) Approximately
10(For Europe
n andIsrael)
50 -100 (Except forEurope and
Israel)
0.40. 0.60
Throttle
position sensor
idle position'3 V
'1: Feedback controlled andneeds noadjustments
'2: Under thefollowing conditions:
• Air conditioner switch:OFF
• Electric load:OFF(Lights, heater,fan
&
rear defogger)
• A/T models: in"N" position
'3: Engine iswarmed upSUfficiently.

IGNITION COIL INJECTOR

Resistance [at25'C (77'F)) n

RESISTOR
Resistance [at25'C (77'F)] kn Approximately
10.14
Approximately 2.2

THROTTLE POSITIONSENSOR

Primary
voltage
Primary resistance
[at 20'C (68'F)]
Secondary resistance
[at 20'C (68'F)]
V

n

kn
12

Approximately 0.5-1.0
Approximately 12 Accelerator
pedalconditions
Completely released
Partially released
Completely depressed Resistance
kn[at25'C (77'F))
Approximately 0.5'
0.5 -4
Approximately 4

MASS AIRFLOW SENSOR
':
Engine iswarmed upsufficiently.
Supply voltage
Output voltage
V

V
Battery
voltage
1.2 -1.8'
': Engine iswarmed upSUfficiently andidling under no-load.

EC-417

SERVICEDATAANDSPECIFICATIONS (SOS)
General Specifications

PRESSURE REGULATOR
Fuel pressure atidling
kPa (bar, kg/cm
2,
psi)
Vacuum hoseisconnected
Vacuum hoseisdisconnected Approximately
235 (2.35. 2.4.34)
Approxi mately
294 (2.94, 3.0,43)
Idle speed'1
No-load'2 rpm
(in "N" position) 800:1:50
Inspection
andAdjustment
FUEL PUMP

Resistance [at25'C (77'F)] n
Approximately 0.2-5.0
Air conditioner: ON
(in "N" position)
Ignition timing
Throttle position sensoridle
position V850
ormore

IACV-AACVALVE

15':1:2' BTDC
Resistance[at25'C (77'F)] n
0.35 -0.65 Approximately
10.0
'1: Feedback controlled andneeds noadjustments
'2: Under thefollowing conditions:
• Air conditioner switch:OFF
• Electric load:OFF(Lights, heaterfan
&
rear defogger)

IGNITION COIL INJECTOR

Resistance [at25'C (77'F)) n'
1_0_-_1_4 _

RESISTOR

Primary voltage
Primary resistance
[at 25'C (77'F))
V

12

0.5 -1.0 Resistance
[at25'C (77'F)) kn ApproXimately 2.2
Secondary resistance
[at 25'C (77'F))
kn
Approximately
25

THROTTLEPOSITIONSENSOR
MASS AIRFLOW SENSOR

Supply voltage
Output voltage
V
V
Battery
voltage (11-14)

1.3 -1.7'
Throttle
valveconditions
Completely closed
Partially open
Completely open Resistance
kn
[at 25'C (77'F)]
Approximately 1
1 - 10
Approximately 10
': Engine iswarmed upsufficiently andidling under no-load.

ENGINE COOLANT TEMPERATURE
SENSOR

Temperature
'c
('F)

20 (68)

50 (122)
90 (194) Resistance
kn
2.1-2.9
0.68 -1.00
0.236 -0.260

HEATED OXYGEN SENSOR HEATER

Resistance [at25'C (77'F)] n
I
3.3-6.3

EC-418

ENGINECOOLING SYSTEM
Cooling Circuit
Reservoir tank
...Thermostat: OPEN
~ Thermostat: CLOSED

•

Water outlet Thermostat
housing
Throttlebody
Intake manifold Heater
SLC9S7AA
LC-9

ENGINECOOLING SYSTEM
Water HoseDrawing
GA14DE andGA16DE withoutVTC
GA 16DE withVTCexcept forAustralia GA15DE
MLC084A

CD
Intake manifold tothermostat
housing-1

@
Intake manifold tothermostat
housing-2
@

Radiator lowerhosetowater
inlet

@
Intake manifold tothrottle body

LC-10
@

Throttle bodytothermostat
housing