engine NISSAN ALMERA N15 1995 Service Manual

Checkthefollowing.
• Harness continuity
between ECMand
intake airtemperature
sensor
If NG, repair harness or
connectors.

NG

INSPECTION
START

CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect intakeairtemperature
sensor harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal @
and ground.

Voltage: Approximately SV
TROUBLE
DIAGNOSIS FORDTC41
rnJ

Intake AirTemperature Sensor(IATS)(Cont'd)
DIAGNOSTIC PROCEDURE

--

~
Intake airtemperature
'" '\ sensor harness connector
AEC550

~ DISCONNECT
ciili
10

AEC723

~i5 ~

dID
CHECK
GROUND CIRCUIT.

1. Turn ignition switch"OFF".
2. Check harness continuity between
terminal
G)
and engine ground.

Continuity shouldexist.
OK

CHECK COMPONENT
(Intake airtemperature sensor).
Refer to"COMPONENT INSPECTION"
on next page.
NG
NG
Check
thefollowing.
• Harness continuity
between ECMand
intake airtemperature
sensor
If NG, repair harness or
connectors
Replace intakeairtem-
perature sensor.

OK

Disconnect andreconnect harnesscon-

AEC724
nectorsinthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector.
Reconnect ECMharness connector and
retest.
INSPECTION END

EC-126

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Throttle Position Sensor

The throttle position sensorresponds tothe accelerator pedal
movement. Thissensor isakind ofpotentiometer whichtrans-
forms thethrottle position intooutput voltage, andemits the
voltage signaltothe ECM. Inaddition, thesensor detects the
opening andclosing speedofthe throttle valveandfeeds the
voltage signaltothe ECM.
Idle position ofthe throttle valveisdetermined
by
the ECM
receiving thesignal fromthethrottle position sensor.Thisone
controls engineoperation suchasfuel cut.

SEF089K

CIl
Supplyvoltage:

r
-i.~h __
~3_
i
45
I
'V ,Appl.' b....
ffi
t~miMI,
No1,,'
31

~_ =r--=-tfr ~
I

l ~
1
N~
I

Throttle position sensor g
-g

'5 ::: 0.5

0-

'5
0 0----- -_.- --------_.

OZ 0 90

Throttle valveopening angle(deg_)
EC-128 SEF520Q

•

INSPECTION
START

m
1

CHECK POWER SUPPLY.
NG
Repair harness orcon-

------.

1. Turn ignition switch"OFF". nectors.
2. Disconnect throttleposition sensor
harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
CD

and ground withCONSULTor tester.

Voltage: Approximately SV

m
1
0K

CHECK GROUND CIRCUIT.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
------.

•Harness foropen or
2. Loosen andretighten engineground short
between ECM
screw. and
throttle position
3. Check harness continuity between sensor
terminal
@
and engine ground. If
NG, repair harness or

Continuity shouldexist.
connectors.
If OK, check harness forshort.

[!J
1
0K

CHECK INPUTSIGNAL CIRCUIT.
NG
Repair harness orcon-
1. Disconnect ECMharness connector.
------.

nectors.
2. Check harness continuity between
ECM terminal
@)
or
@
and terminal

@.

Continuity shouldexist.

If OK, check harness forshort.
~OK
ADJUST THROTTLE POSITIONSEN-
SOR. Perform "BasicInspection", EC-65.

~

CHECK COMPONENT NG
Replace throttleposition
(Throttle positionsensor).
------.

sensor. Toadjust it,per-
Refer to"COMPONENT INSPECTION" form
"Basic Inspection",
on next page. EC-65.
~OK
Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
~ Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.

i

INSPECTION END

SEF480Q
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Throttle Position Sensor(Cont'd)
DIAGNOSTIC PROCEDURE

,~\ C/

Power steering)\
~

m

GA15DE
EC-131

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Start Signal (Cont'd)
DIAGNOSTIC PROCEDURE
CHECK OVERALL FUNCTION.

00
1.
Turn ignition switch"ON".

I
II
2.
Perform "STARTSIGNAL
NEXT
START
CKT"
in"FUNCTION TEST"
MEF481B mode
withCONSULT.
OR

m
00
2.
Check "START SIGNAL" in
* MONITOR *
NO FAIL
0
"DATA
MONITOR" modewith
START SIGNAL CONSULT.
OFF

I

CLSDTH/PSW
ONIGN
"ON" OFF
AIR COND SIG OFF
IGN"START" ON
PIN POSI SW ON

II
•
START SIGNAL CKT.
CLOSE THROTTLE. SHIFT
TO POR NRANGE.
2. TOUCH STARTAND
START ENGINE
IMMEDIATELY.

~ __ RE_C_O_R_D_---,l

SEF111P

~I)~ID

ECM
B
CONNECTOR
II

34 20
INSPECTION
START

OR

1. Turn ignition switchto
"START".
2. Check voltage between ECM
terminal @or
@l
and
ground.

Voltage:
Ignition switch"START"
Battery voltage
Except above
Approximately OV

NG OK

INSPECTION END

II
@:

ForAustralia
34 :Except forAustralia

~Io

ECM
ET
CONNECTOR
II

34 20

@:
ForAustralia

@:
Except forAustralia SEF231R
SEF232R Check
if7.5A fuseisOK.
OK
CHECK INPUTSIGNAL CIRCUIT.
1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector
and 7.5A fuse.
3. Check harness continuity between
ECM terminal @or
@l
and fuse
block.

Continuity shouldexist.

If OK, check harness f<;>rshort.
OK
Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.
INSPECTION END
EC-140
NG
NG
Replace
7.5Afuse.
Check thefollowing.
• Harness connectors

(ID,@

• Harness foropen or
short between ECM
and fuse block
If NG, repair harness or
connectors.

•

INSPECTION END
Check thefollowing.
• Harness connectors

@,@or@,

@

• Harness connectors

@,CillD

• Harness foropen or
short between injector
and ignition switch
If NG, repair harness or
connectors.

OK
NG
DIAGNOSTIC
PROCEDURE

INSPECTION START

CHECK OVERALL FUNCTION.

(F.I\
1.Start engine.
~ 2.Perform "POWER BALANCE"
in "ACTIVE TEST"modewith
CONSULT.
3. Make surethateach circuit
produces amomentary engine
speed drop.

OR

fff\
1.Start engine.
~ 2.Listen toeach injector operat-
ing sound.

Clicking noiseshould be
heard.
CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect injectorharness connec-

tor.

3. Turn ignition switch"ON".
4. Check voltage between terminal @
and ground withCONSULT ortester.

Voltage: Batteryvoltage
AEC872
SEF730L

/~~

Click

Ct.
'~.+

Fuel injector harness
connector

II

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Injector (Cont'd)
COMPONENT DESCRIPTION

The fuel injector isasmall, precise solenoid valve.Whenthe
ECM supplies aground tothe injector circuit,thecoil
in
the
injector isenergized. Theenergized coilpulls theneedle valve
back andallows fueltoflow through theinjector intotheintake
manifold. Theamount offuel injected depends upontheinjec-
tion pulse duration. Pulseduration isthe length oftime the
injector remains open.TheECM controls theinjection pulse
duration basedonengine fuelneeds.

SEF596K

• ACTIVE TEST.
D

••• POWER BALANCE •••

= ==
MONITOR
=
==

CMPS.RPM(REF) 737rpm
MAS AIR/FL SEN098V
IACV-AAC/V 41%

110Q]Q]~

DDDDc:J
MEF354F
~7~

~ \)drJ

At idle

--
/ I

AEC755EC-143

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump
SYSTEM DESCRIPTION

Enginespeed
Camshaft positionsensor
Startsignal
Ignition switch
The ECM activates thefuel pump forseveral sec-
onds aftertheignition switchisturned onto
improve enginestartability. Ifthe ECM receives
a 180
0
signal fromthecamshaft positionsensor,
it knows thattheengine isrotating, andcauses
the pump toperform. Ifthe 180
0
signal isnot
received whentheignition switchison, the
engine stalls.TheECM stops pump operation
and prevents batterydischarging, thereby
improving safety.TheECM does notdirectly
drive thefuel pump. Itcontrols theON/OFF fuel
pump relay, which inturn controls thefuel pump.
ECM

(ECCS
control module)
Condition
Ignition switchisturned toON.
Engine running andcranking
When engine isstopped
Except asshown above Fuel
pump relay
Fuel pump operation
Operates for
5 seconds
Operates
Stops in1second
Stops
•

COMPONENT DESCRIPTION

A turbine typedesign fuelpump isused inthe fuel tank.

AEC801
EC-145

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

Camshaft positionsensor Engine
speed

I
Mass
airflow sensor Amount
ofintake air

I

Engine coolant temperature sensor Engine
coolant temperature

~

I

Ignition switch Start
signal

I

Throttle positionsensor Throttle
position

~

I

Inhibitor switch(A/Tmodels)/
Park/Neutralposition
Neutral position switch(M/Tmodels) ECM
(ECCS
Air conditioner operation control

!
IACV-AAC valve
I

Air conditioner switch
module)
Power steering oilpressure switch Power
steering loadsignal

I
Battery
~
Battery voltage
Vehicle speedsensor Vehicle
speed
Cooling fanrelay Cooling
fanoperation
Load switch' Electrical
load
Blower fanswitch Blower
fanoperation
': Rear window defogger switchandheadlamp switch.

This system automatically controlsengineidlespeed toaspecified level.Idlespeed iscontrolled
through fineadjustment ofthe amount ofair which bypasses thethrottle valveviaIACV-AAC valve.The
IACV-AAC valveopens andcloses (except forEurope andIsrael), orrepeats ON/OFF operation (for
Europe andIsrael), according tothe signal sentfrom theECM. Thecamshaft positionsensordetects
the actual engine speedandsends asignal tothe ECM. TheECM thencontrols theIACV-AAC valveso
that engine speedcoincides withthetarget valuememorized inECM. Thetarget engine speedisthe
lowest speedatwhich theengine canoperate steadily. Theoptimum valuestored inthe ECM isdeter-
mined bytaking intoconsideration variousengineconditions, suchasduring warmup,deceleration, and
engine load(airconditioner, powersteering andcooling fanoperation).

COMPONENT DESCRIPTION
IACV-AAC valve-Except forEurope andIsrael

The IACV-AAC valveismoved byopen andclose signals from
the ECM. When theopen signal issent tothe valve, theamount
of air that willflow through thevalve increases. Themore air
that flows through thevalve, thehigher theidle speed. When
the close signal issent tothe valve. theamount ofair
decreases.

EC-150

Repairharness orcon-
nectors. INSPECTION
END
Check thefollowing.
• Harness connectors

QD,@orQD,

@

• 10A fuse
• Harness foropen or
short between IACV-AAC
valve andfuse
If NG, repair harness or
connectors.

NG OK
NG
OK

INSPECTION
START
CHECK OVERALL FUNCTION.
1. Start engine andwarm itup suffi-
ciently.
2. Check idlespeed.
If NG, adjust idlespeed.
~ 3.• Perform "AACVALVE
~ ADJ"or"IACV-AACIV
ADJ" in"WORK
SUPPORT" modewith
CONSULT.
• Disconnect throttleposi-
tion sensor harness con-
nector.
4. Make surethatidlespeed drops.

OK
@

CHECK
POWER SUPPLY.
1. Stop engine.
2. Disconnect IACV-AACvalveharness
connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

or
G)
and ground.

Voltage: Batteryvoltage

CHECK OUTPUT SIGNALCIRCUIT.
1. Turn ignition switch"OFF".

(ij\
2.Reconnect IACV-AACvalve
~ harnessconnector andthen
start engine.
3. Perform "IACV-AACIV
SYSTEM" in"FUNCTION
TEST" modewithCONSULT.

OR

(F.I\
3.Perform "IACV-AACIV
~ OPENING" in"ACTIVE TEST"
mode withCONSULT.

OR

M
2.Disconnect ECMharness con-
~ nectar.
3. Check harness continuity
between ECMterminal
(ill)

or
@
and terminal
@,
ECM
terminal
GID
or
@
and
terminal
@.

Continuity shouldexist.
If
OK, check harness forshort.

SEF233R
SEF142NC

o

•
ACTIVE TEST.
LET
ENGINE IDLE
THEN
TOUCH START

(AiC
SW-UGHT SWOFF)
•
IACV-AACN SYSTEM.
I ACV-AACN 34%
OPENING

==========
MONITOR
==========

CMPS-RPM (REF)712rpm
MAS AIRIFL SE 1.13V
COOLAN TEMPtS 92°C

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
ffiJ

Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)
DIAGNOSTIC PROCEDURE

!:::=====mul===

I
NEXT" START
I

MEF176E

CD
:
For Europe andIsrael

@ :
Except forEurope andIsrael
~

Ii)

~i5~i5
dfu
CillffuID

illU--illU
~[]fl[OOWN][Qill SEF484Q
EC-154

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS

Cooling FanControl

SYSTEM DESCRIPTION
Vehicle speedsensor
Engine coolant temperature sensor
Air conditioner switch Vehicle
speed
Engine coolant temperature
Air conditioner "ON"signal
EGM

(EGGS
control
module) Gooling
fan relay(s)
MIT MODELS
The ECM controls thecooling fancorresponding tothe vehicle speed,engine coolant temperature, and
air conditioner ONsignal. Thecontrol system has2-step control [ON/OFF].

Operation
For Europe withdaytime lightsystem

E~
::J
0

~Z;
2i
o

E

~
~

'0
o

o

Gl

c

'0>
c

w
Air
conditioner switchIs"OFF".

/,

100 (212)

95 (203)

rr

20 80

(12) (50)

Vehicle speedkm/h(MPH)

D :
Cooling fansdonot operate.
~
iL
Airconditioner switchIs"ON".

~ ~ 11'l1/1~~~
:v
() /'/"

0.
0

E
~

!
95(203)

.~ 2080

ill
(12)(50)

Vehicle speedkm/h(MPH)

EZ2l :
Cooling fansoperate.
SEF902P

For Europe withoutdaytime lightsystem andAustralia

Gl_

2~
.,
-

:v ()

0.0

E
~
~

'0
o

o

Gl

c

'0>
c

w
Air
conditioner switchIs"OFF",

105 (221)

95 (203)
91 (196)

2080

(12) (50)

Vehicle speedkm/h(MPH)

D :
Cooling fansdonot operate.
Air
conditioner switchIs"ON",

100 (212)

2080

(12) (50)

Vehicle speedkm/h(MPH)
~ :Cooling fansoperate.
SEF649MB
EC-156

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS

Cooling FanControl (Cont'd)

AIT MODELS

The ECM controls thecooling fancorresponding tothevehicle speed,engine coolant temperature, and
air conditioner ONsignal. Thecontrol system has3-step control
[HIGH/LOW/OFF],

Operation
For Europe withdaytime lightsystem

•

SEF904P

Air
conditioner switchIs"ON".

105 (221)
100 (212)
95 (203)

Air
conditioner switchIs"OFF".

95 (203)

105
(221)
100 (212)

C

'0
o

()

Q)

c

'0>
c

UJ
~
iL

::J
0

e;-
~o

E
~

C

'0
o

()

Q)
~ 00
i~
00

(12) (50)
tD
(12)(50)

Vehicle speedkm/h(MPH) Vehiclespeedkm/h(MPH)

o :
Cooling fansdonot operate. ~:Cooling fansoperate at"Low" speed. ~:Cooling fansoperate at"High" speed.
For Europe withoutdaytime lightsystem andAustralia

SEF905P

Air
conditioner switchis"ON",

105 (221)
100 (212)
95 (203)

Air
conditioner switchIs"OFF".

95 (203)
91 (196)
105
(221)
100 (212)

~

'0
o

()

Q)

c

'0>
c

UJ
~~
::J
0

(;j-

.... 0

~o

E

2

C

'0
o

()

Q)

~ 00
i~
00

(12) (50)
tD
(12)(50)

Vehicle speedkm/h(MPH) Vehiclespeedkm/h(MPH)

o :
Cooling fansdonot operate.
l22a:
Cooling fansoperate at"Low" speed. ~:Cooling fansoperate at"High" speed.

EC-157