sensor NISSAN ALMERA N15 1995 Service Manual

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
Cooling FanControl
SYSTEM DESCRIPTION
Cooling fancontrol

I
Vehicle speedsensor
I

Vehicle speed
Engine coolant temperature EGM
Engine coolant temperature sen- (EGGS

~

sor control
module)

I
Air conditioner switch
I

Air conditio~er "ON"signal
I

Goaling fanrelay(s)

•

The ECM controls thecooling fancorresponding tothe vehicle speed,engine coolant temperature, and
air conditioner ONsignal. Thecontrol system has3-step control [HIGH/LOW/OFF] onA/T models and
2-step control [ON/OFF] onM/T models.

Operation
For AIT models
Airconditioner switchis"ON".

20 80

(12) (50)

Vehicle speedkm/h(MPH)

m!lll:
Cooling fansoperate at"High" speed.
MEC772B
~u:

~ ?-
105 (221)

~ 0

2i
0
100 (212)

E

2
95(203)

C

'"

o

o

o

20 80
OJ

(12) (50) .~

Vehicle speedkm/h(MPH) ~
~: Cooling fansoperate at"Low" speed.

~LL

.3
?-
105 (221)

~o

2i
0
100 (212)

E

2
95(203)

C

'"

o

o

o

OJ

c:

.0,

c

w

0:
Cooling fansdonot operate.
For MIT models
Airconditioner switchis"OFF".

2080

(12) (50)

Vehicle speedkm/h(MPH)

~
u:
Airconditioner switchis"ON".
::J
0

1il
Z;
105 (221)

OJ
0

E
100(212)

OJ

- 95(203)

C

'"

o

o

o

OJ

c

0,

c

ill

I

20 80

(12) (50)

Vehicle speedkm/h(MPH)
~u:
::J
0

1il ;-
105 (221)

OJ
0

~ 100(212)

<1>

- 95(203)

C

'"

o

o

o

OJ

c

.0,

c

ill

0:
COOling fansdonot operate. m
:Cooling fansoperate at"High" speed.
MEC773B
EC-343

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Cooling FanControl (Cont'd)
• COOLING FANCIRCUIT.
DOES
Cooling fan
MEC475B
COOLING
FAN

•

Check
cooling fanhigh
speed control circuit.
(Go to

I
PROCEDURE B
I.

EC-351.)
NG
OK
CHECK
COOLING FANHIGH SPEED
OPERATION.
1. Turn ignition switch"OFF".
2. Reconnect coolingfanrelays-2 and
-3.
3. Disconnect coolingfanrelay-1.

(ij\
4.Turn ignition switch"ON".
~ 5.Perform "COOLING FAN
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.
OR

fiii\
4.Turn ignition switch"ON".
~ 5.Perform "COOLING FAN"in
"ACTIVE TEST"modewith
CONSULT.

OR

4. Turn airconditioner switch
and blower fanswitch "OFF"
(Models withairconditioner).
5. Disconnect enginecoolant
temperature sensorharness
connector.
6. Connect 150Qresistor to
engine coolant temperature
sensor harness connector.
7. Restart engineandmake sure
that cooling fanoperates at
higher speedthanlowspeed.

Ii
--- ---

150(1 resistor
ROTATE
ANDSTOP
EVERY 3SECONDS
"I

NEXT
II
NO
II
YES
I

MEF311F
COOLAN TEMP/S
•
ACTIVE TEST. D
COOLING FAN
OFF

= ==
MONITOR

clTJI
LOW
1.1-

MEF314F

Ii
Ii
INSPECTIONEND
EC-349

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[]K]

Heated Oxygen Sensor(H02S)

EC-H02S-01

IGNITION SWITCH
ON orSTART

10A

[l[J
FUSE

BLOCK
(JIB)

~
Refer
toEL-POWER.

IN:OI

BR!Y
I

BR/Y

,cID,@

=r@

BR/Y

I

BR/Y

m
HEATED
OXYGEN
SENSOR

I4=!J ~


- OR W
-:
Detectable line
for DTC
-: Non-detectable
line forDTC

OR

urtru
02H
F
4

tl
I
I

I

I

I
JOINT

I
CONNECTOR-6

I
em

W .~.....--~

u=f9l1
In

025 ECM 8B8

(~g~~ROL
,_I
-I
1

MODULE)
-L

cw.
m~

!Il'
I'I~
@

3456 W
~

U@..@)
GY
~em

CDODJDJDJDJD
GY
Refe~
tolast page
(Foldout page).

EC-362
CED

L

HEC020

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S)(Cont'd)
SYSTEM DESCRIPTION
Heated oxygen sensorheatercontrol

ECMHeated

I
Crankshaft positionsensor
I

Engine speed (ECCS

~
oxygen

~
control sensor
module) heater

OPERATION •

--~-

The
ECM performs ON/OFFcontrolofthe heated
oxygen sensorheatercorresponding tothe
engine speed.

Enginespeedrpm

Above 3,200
Below 3,200
Heated
oxygen sensor
heater

OFF
ON

i
Heaterpad
Isolation
bearing Zirconia

i

tube
SEF406H COMPONENT
DESCRIPTION
The heated oxygen sensorisplaced intothefront tube. It
detects theamount ofoxygen inthe exhaust gascompared to
the outside air.The heated oxygen sensorhasaclosed-end
tube made ofceramic zirconia. Thezirconia generates voltage
from approximately 1Vinricher conditions to
av
inleaner con-
ditions. Theheated oxygen sensorsignalissent tothe ECM.
The ECM adjusts theinjection pulseduration toachieve the
ideal air-fuel ratio.Theideal air-fuel ratiooccurs neartherad-
ical change from1Vto
av.

2
1

::>

OJ
~

(5

>

"5
c.

"5

0

:'--

0

-

Rich ---
Ideal

ratio _
Lean
Mixture ratio

SEF288D
EC-363

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S)(Cont'd)
DIAGNOSTIC PROCEDURE
• MIXTURE RATIOTEST.
ACCELERATE TO2000
RPM AND HOLD THEN
TOUCH START.
INSPECTION
START

*
NO FAIL
0

II=]

1800 20002200
ij

NEXT
II
START
J

RECORD \ I/

'~/'

- CHECK-

/
......

/ I\
INSPECTION
END

OK
NG
CHECK
HEATED OXYGEN SENSOR
CIRCUIT.

1. Start engine andwarm itup suffi-
ciently.

rF.i\
2.Perform "MIXTURE RATIO

\J!J
TEST"in"FUNCTION TEST"
mode withCONSULT.

OR

rF.i\
2.Make surethat"M/R FIC

\J!J
MNT"in"DATA MONITOR"
mode indicates "RICH"and
"LEAN" periodically more
than 5times during 10 sec-
onds at2,000 rpm.

OR

~ 2.Stop engine andsetECM
~ Diagnostic TestMode II
(Heated oxygensensormoni-
tor).
3. Restart engineandrunitat
about 2,000rpmforabout 2
minutes underno-load.
4. Keep engine speedat2,000
rpm andmake surethatthe
malfunction indicatorlampon
the instrument panelgoeson
and offmore than5times dur-
ing 10seconds.

SEF815L

I

MEC782B

2000rpm

RICH

CMPSoRPM
(REF)
M/R FICMNT

*.

MONITOR
Repairharness orcon-
nectors.

NG
OK
@
SEF089PA
Malfunction
indicator
lamp

~

Heated oxygen '~~
sensor harness connector \

ij
~I 1-''--\
CHECK
INPUTSIGNAL CIRCUIT.
SEF051PA
1.Turn ignition switch"OFF".
'-------------------' 2.Disconnect heatedoxygen sensor
harness connector andECM harness
connector.
3. Check harness continuity between
ECM terminal
@
and terminal
@.
Continuity shouldexist.

4. Check harness continuity between
ECM terminal
@
(orterminal
@)

and ground.

Continuity shouldnotexist.

if OK, check harness forshort.

II
~i5

ECM
-er
CONNECTOR
II

19
~i5

~
MEC735B EC-364

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S) (Cont'd)

•

Repair harness orcon-
nectors. Go
to"CHECK
COMPONENT".
Check thefollowing.
• Harness connectors

aD,@

• 10A
fuse
• Harness foropen or
short between heated
oxygen sensorand
fuse
If NG, repair harness or
connectors.

OK
NG
NG
OK
CHECK
HEATED OXYGEN SENSOR
HEATER CIRCUIT.

1. Reconnect harnessconnectors.
2. Start engine.
3. Check voltage between ECMterminal

Gill
andground withCONSULT or
tester underthefollowing conditions.

Voltage: Engine speedisbelow 3,200rpm
Approximately OV
Engine speedisabove 3,200rpm
Battery voltage
CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect heatedoxygen sensor
harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground.

Voltage: Batteryvoltage@
CHECK OUTPUT SIGNALCIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector.
3. Check harness continuity between
terminal
G)
and ECM terminal
Gill.
Continuity shouldexist.
If
OK, check harness forshort.

SEF646P
MEC784B

~i5

cillID
MEC783B

~i5

ECM
J9"
CONNECTOR
II

111

@J

~i)~ID

II
ECM
J9"
CONNECTOR
II

111

OK

Loosen andretighten engineground
screws.
CHECK COMPONENT
(Heated oxygensensorheater).
Refer to"COMPONENT INSPECTION"
on next page.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
NG

Replace heatedoxygen
sensor.
Trouble isnot fixed
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

EC-365

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS[][]
Heated Oxygen Sensor(H02S)(Cont'd)
COMPONENT INSPECTION
Heated oxygen sensorheater

Check resistance betweenterminals
CD
and
CID.

Resistance:
3.3•6.30
[at
25°C (77°F)]

If NG, replace theheated oxygen sensor.

AEC745
EC-366

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

relay-2ENGINE
ANDEMISSION CONTROLOVERALLSYSTEM
Component PartsLocation
Engine coolant
temperature sensor
Glowplugs
•

EC-383 SEF159R