1995 NISSAN ALMERA N15 Service Manual

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

EC-LKUP-01

I
Q.61

Y
I

Y

1[~]Im

=r=~
Y

I

Y

r=b
TORQUE
~3 CONVERTER
CLUTCH
SOLENOID
11111 VALVE

=r=@ID

PIS

I

PIS

r=bm

1~1@g)

PIS

L
PIS~ PIS-PIS iJJ-
PIS
l
~(][) @@

PIS

IF1I5n

LKUP -:
Detectable line
for DTC
IGNITION
SWITCH
ON orSTART

10A

[]]
FUSE
SLOCK
(J/S)

Refer
toEL-POWER.

-:
Non-detectable
line forDTC
ECM (ECCS
CONTROL
MODULE)

em
•

~~,m
~ SGY
Refer
tolast page
(Foldout page).

EC-367
(IT)

L

HEC023

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

TROUBLEDIAGNOSIS FuRNON-DETECTABLE ITEMS
[![]

Torque Converter ClutchSolenoid Valve(Cont'd)

@

~i5

~

~i5

II
ECM
Ef
CONNECTOR
II

115 SEF513Q
~ SEF514Q CHECK
OUTPUT SIGNALCIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector.
3. Check harness continuity between
ECM terminal
@
andterminal
G).
Continuity shouldexist.

If OK, check harness forshort.

OK

CHECK COMPONENT
(Torque converter clutchsolenoid
valve).
Refer to"Electrical Components
Inspection" in
AT
section.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

EC-369 NG
NG
Check
thefollowing.
• Harness connectors

@@,@

• Harness connectors

@D,@

• Harness connectors

@,CID

• Harness foropen or
short between ECM
and torque converter
clutch solenoid valve
If NG, repair harness or
connectors.
Replace torqueconverter
clutch solenoid valve.
•