check engine NISSAN ALMERA N15 1995 Service Manual

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Cooling FanControl (Cont'd)

•

PROCEDURE
B

INSPECTION START

1:1
CHECK POWER SUPPLY. NG
Check thefollowing.

----..

1. Stop engine. •Harness foropen or
2. Disconnect coolingfanrelay-2. short
between cooling
3. Turn ignition switch"ON". fan
relay-2 andfuse
4. Check voltage between terminals
G),
•
Harness foropen or

@
and ground. short
between cooling

Voltage: Batteryvoltage
fan
relay-2 andfusible

.
OK link

If
NG, repair harness or
connectors.
CHECK GROUND CIRCUIT. NG
Repair harness orcon-
1. Turn ignition switch"OFF".
----..

nectors.
2. Disconnect coolingfanmotor-1 har-
ness connector andcooling fan
motor-2 harness connector.

o
3.Check harness continuity
between terminal
@
and termi-
nal
@.

Continuity shouldexist.

If OK, check harness forshort.

II
4.Check harness continuity
between terminal
@
and termi-
nal
@,
terminal
(!)
and body
ground.

Continuity shouldexist.

If OK, check harness forshort.
OK

II
CHECK OUTPUT SIGNALCIRCUIT. NG
Check thefollowing.
1. Disconnect ECMharness connector.
----..

•Harness connectors
2. Check harness continuity between
@,@

ECM terminal
@
or
@l
and terminal •
Harness connectors

@.
@,@D

Continuity shouldexist.
•
Harness foropen or
If OK, check harness forshort. short
between ECM
OK and
cooling fanrelay-2

If
NG, repair harness or
connectors.

MEC346B

o

•
ACTIVE TEST.
COOLING FAN
OFF

COOLAN TEMP/S 88°C

=
= =
MONITOR
== =

1:1
~i5
~3
7 5

2 1

EC-165

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Cooling FanControl (Cont'd)
@

o

~i5
~-

m=m
CHECK
COMPONENT
(Cooling fanrelay-2).
Refer to"COMPONENT INSPECTION"
on next page.
NG

Replace coolingfan
relay.

OK

II
Replacecoolingfan
motors.

NG
OK
SEF226R
SEF227R

~i5
00

Jm1
3
7 5

2 1
CHECK
COMPONENTS

~ IDlsco~
(Coolingfanmotors-1 and-2).

I...s1
0~
1.Rec~nnect coolingfanrelay-2,

~ \J!}
coolingfanmotor harness

QW
connectors,enginecoolant
temperature sensorharness
connector andECM harness
connector.
2. Turn ignition switch"ON".
3. Perform "COOLING FAN
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.

OR

3. Perform "COOLING FAN"in
"ACTIVE TEST"modewith
CONSULT.
OR

~ Referto"COMPONENT
~ INSPECTION" onnext page.

~i5
:~

rn=m

~i5

ECM
El'CONNECTORII

13 10

II

@:
ForAustralia

@:
Except forAustralia SEF196R
Disconnect
andreconnect harnesscon-
nectors inthe circuit. Thenretest.

II
•COOLING FANCIRCUIT.
DOES
COOLING FAN
ROTATE ANDSTOP
Trouble
isnot fixed .
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.

EVERY 3SECONDS
7

NEXT
II

NO
II
YES
I

MEF311F
INSPECTION
END

II •
ACTIVE TEST.
COOLING FAN

OFF

=
= =
MONITOR
COOLAN TEMPjS
---
---

ggoC
CJ5_N_I~ MEF312F
EC-166

•

INSPECTION END

OK

The
power steering oilpressure switchisattached tothe power
steering high-pressure tubeanddetects apower steering load.
When apower steering loadisdetected,
it
signals theECM. The
ECM adjusts theIACV-AAC valvetoincrease theidle speed and
adjust forthe increased load.

INSPECTION START

OR

1. Start engine.
2. Check voltage between ECM
terminal
@
or
@
and ground.

Voltage: When steering wheelis
turned quickly.
Approximately OV
Except above
Approximately 5V
NG
DIAGNOSTIC
PROCEDURE
CHECK OVERALL FUNCTION.

fiii\
1.Turn ignition switch"ON".
~ 2.Perform "PW/STSIGNAL
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.

OR

(F.i\
1.Start engine.
~ 2.Check "PW/ST SIGNAL" in
"DATA MONITOR" modewith
CONSULT.

Steering isin neutral
position: OFF
Steering isturned:

ON

SEF591I
SEF235R
MEF023E

Power
steering oil___
pressure switch

-
~

to

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
@[]

Power Steering OilPressure Switch(Cont'd)
COMPONENT DESCRIPTION

RECORD

NEXT

II
START

•
PW/ST SIGNAL CIRCUIT.
HOLD STEERING WHEEL
IN AFULL

LOCKED
POSITION
THEN
TOUCH START
* MONITOR *NO FAIL
0

PW/ST SIGNAL OFF

@):
ForAustralia

@:
Except forAustralia

~i)~

II
ECM
Ef
CONNECTOR
II

43 25

EC-171

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
@K]

Power Steering OilPressure Switch(Cont'd)
@:
ForAustralia

@:
Except forAustralia SEF176R
Repair
harness orcon-
nectors.
CHECK INPUTSIGNAL CIRCUIT. NG
Check thefollowing .
1. Disconnect ECMharness connector.
......---..

•Harness connectors
2. Check harness continuity between
aD,

(MID

ECM terminal
@
or
@
and terminal •
Harness connectors

G).
@,@or@,
Continuity shouldexist.
If
OK, check harness forshort. •
Harness foropen or
OK short
between ECMand
power steering oilpres-
sure switch
If NG, repair harness or
connectors.
CHECK COMPONENT NG
Replace powersteering
(Power steering oilpressure switch).
--...

oilpressure switch.
Refer to"COMPONENT INSPECTION"
below.
OK
Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage or
the connection ofECM harness connec-
tor. Reconnect ECMharness connector
and retest.
@

1

CHECK GROUND CIRCUIT.
1. Turn ignition switch"OFF".
2. Disconnect powersteering oilpres-
sure switch harness connector.
3. Check harness continuity between
terminal
@
and engine ground.
Continuity shouldexist.

AEC760
IfOK, check harness forshort.

~i5
[i

c:ITb

~i5

ECM
Ef
CONNECTOR
II

43 25

II

INSPECTIONEND

Power steering oilpressure switch

1. Disconnect powersteering oilpressure switchharness con-
nector thenstart engine.
2. Check continuity betweenterminals
and
@.

[At

IV
ID

~ COMPONENT
INSPECTION

Conditions
Steering wheelisbeing turned
Steering wheelisnot being turned Continuity

Yes
No
AEC762
IfNG, replace powersteering oilpressure switch.

EC-172

•

INSPECTION
START

m
CHECK VACUUM SOURCETOEVAP OK
CHECK COMPONENT
CANISTER.
L---.

(EVAPcanister).
1. Jack updrive wheels. (See
page EC-29.)
2. Start engine andwarm itup suffi- If
NG, replace EVAPcan-
ciently. ister.
3. Perform diagnostic testmode II(Self-
diagnostic results).Makesurethat
9iagnostic troublecodeNo.55isdis-
played.
4. Disconnect vacuumhosetoEVAP
canister.
5. Set shift lever to1st position.
6. Make surethatvacuum existsunder
the following conditions.

At Idle:
Vacuum shouldnotexist.
Racing enginefromIdleto3,000 rpm:
Vacuum shouldexist.

NG

Ii)
[!J

CHECK CONTROL FUNCTION. OK
Check vacuum hosefor
1. Check voltage between ECMterminal
--..

clogging, cracksor

@
andground withCONSULTor improperconnection.
tester underthefollowing conditions.

Voltage: At idle
Approximately OV
Engine speedisabout 2,000rpm
Battery voltage

NG

I!l
CHECK POWER SUPPLY. NG
Check thefollowing.
1. Stop engine.
I-----.

•Harness connectors
2. Disconnect EVAPcanister purgecon-
QD,@

trol solenoid valveharness connector. •10A fuse
3. Turn ignition switch"ON". •
Harness foropen or
4. Check voltage between terminal
@
short
between EVAP
and ground withCONSULTor tester. canister
purgecontrol

Voltage: Batteryvoltage
solenoid
valveandfuse

r
K If
NG, repair harness or
connectors.

SEF816F
SEF488Q
MEC325B
MEC296BB
Clogging TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

EVAP Canister PurgeControl Solenoid Valve
(Cont'd)
DIAGNOSTIC PROCEDURE
~i5
ECM
B
CONNECTOR
II
'f
~VV1

~ Crack

~i5
~

=:5---

~ Improperconnection

@
EC-181

INSPECTIONSTART

m
CHECK OVERALL FUNCTION.
~INSPECTION
END
1) Jack updrive wheels.
2) Start engine andwarm itup suffi-
ciently.
3) Perform diagnostic testmode II(Self-
diagnostic results).
Make surethatdiagnostic trouble
code No.55isdisplayed.
4) Set theshift lever to1st position.
5) Make surethatEGR valve spring
moves upand down (Useyourfin-
ger) under thefollowing conditions.

At idle:
SprIng doesnotmove.
RacIng engIne fromidleto3,000
rpm:
Spring moves upand down.

NG

l!1
CHECK VACUUM SOURCES TOEGR OK
CHECK COMPONENTS
VALVE ANDEVAP CANISTER.
-----...

(EGRvalve, EGRC-BPT
1) Disconnect vacuumhosestoEGR valveandactivated EVAP
valve andEVAP canister. canister).
2) Make surethatvacuum existsunder Refer
to"COMPONENT
the following conditions. INSPECTION".(Seepage

At idle:
EC-188.)

Vacuum shouldnotexist.

lNG

Racing engine fromidleto3,000
rpm: Vacuum shouldexist.
Replace
malfunctioning
component(s).
NG
[!J
I!l

CHECK CONTROL FUNCTION. OK
CHECK VACUUM HOSE.
1) Check voltage between ECMterminal
----..

1)Check vacuum hose

@
or
GID
andground underthe forclogging, cracksor
following conditions. improper
connection.

Voltage: At Idle
Approximately OV
Engine speedis2,500 rpm
Battery voltage

~NG
SEF179R

~=.
Crack
Clogging MEF51BE
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[]K]

EGR Valve andEVAP Canister PurgeControl
Solenoid Valve(Cont'd)
DIAGNOSTIC PROCEDURE

~I)
~ID

ECM
-gcoNNEcTORII ~

103 105
~.1

@ :
For Australia

@ :
Except forAustralia

II

Cf~H

~

~ Improperconnection

SEFB16F
EC-186

•

Check
thefollowing.
• Harness connectors

@,@

• 10A fuse
• Harness continuity
between EGRvalve
&

EVAP canister purge
control solenoid valve
and fuse

If
NG, repair harness or
connectors.

NG
OK

CHECK
POWER SUPPLY.
1) Stop engine.
2) Disconnect EGRvalve
&
EVAP canis-
ter purge control solenoid valvehar-
ness connector.
3) Turn ignition switch"ON".
4) Check voltage between terminal
@

and ground.

Voltage: Batteryvoltage
SEF488Q

~i8
dfu
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[QK]

EGR Valve andEVAP Canister PurgeControl
Solenoid Valve(Cont'd)

@

~i8

~

~i5

ECM
]gCONNECTORII

103 105

II

Ii
Ii

@:
ForAustralia

@:
Except forAustralia CHECK
OUTPUT SIGNALCIRCUIT.
1) Turn ignition switch"OFF".

SEF238R
2)Disconnect ECMharness connector.
3) Check harness continuity between
ECM terminal Gillor
@
andter-
minal
G).
Continuity shouldexist. NG

Repair harness orcon-
nectors.

OK

CHECK COMPONENT
(EGR valve
&
EVAP canister purgecon-
trol solenoid valve).
Refer to"COMPONENT INSPECTION".
NG

Replace EGRvalve
&

EVAP canister purgecon-
trol solenoid valve.

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-187

2:
1

:>
Q)

Ol

~

0
>

::;
c.

::;

0
,,"--

0
-

Rich- Idealratio _
Lean
Mixlure ratio
SEF288D
•

Zirconia
tube SEF406H
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S)(Cont'd)

The heated oxygen sensorisplaced intotheexhaust manifold.
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.

L
Healerpad
Isolalion
bearing

m
•MIXTURE RATIOTEST.
ACCELERATE TO2000
RPM AND HOLD THEN
TOUCH START

I£J

1800
20002200

~J

NEXT

II
START

SEF815L

m
*
MONITOR
*

NO FAIL

D

CMPS.RPM (REF)2000rpm
MIR FICMNT RICH
DIAGNOSTIC
PROCEDURE
RECORD
\ I/

........ e",/

- CHECK-

",/
........

/ I\
I

SEF522Q
INSPECTION
START
CHECK OXYGEN SENSORCIRCUIT.
1) Start engine andwarm itup suffi-
ciently.

(F.i\
2)Perform "MIXTURE RATIO
~ TEST"in"FUNCTION TEST"
mode withCONSULT.

OR

(F.i\
2)Make surethat"M/R
FIC

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

OR

fti>\
2)Stop engine andsetECM
~ Diagnostic TestMode
/I

(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.

NG

@
OK

INSPECTION END

Malfunction indicator
lamp SEF051PA
EC-191

I;)
1

CHECK INPUTSIGNAL CIRCUIT. NG
Repair harness orcon-
1. Stop engine.
--.

nectors.
2. Disconnect ECMharness connector
and heated oxygen sensorharness
connector.
3. Check harness continuity between
ECM terminal
@
or
@
and terminal

@.

Continuity shouldexist.
If OK, check harness forshort.

1
0K
CHECK HEATED OXYGEN SENSOR OK
Goto"CHECK
HEATER CIRCUIT.
--.

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

@
(ForEurope andIsrael) or
@

(For Australia AfTmodels) and
ground withCONSULTor tester
under thefollowing conditions.
Voltage:
Engine speedisbelow 3,200rpm
Approximately OV
Engine speedisabove 3,200rpm
Battery voltage
NG

[!J

CHECK POWER SUPPLY. NG
Check thefollowing.
1. Stop engine.
~

•Harness connectors
2. Disconnect heatedoxygen sensor

aD,@

harness connector. •10A fuse
3. Turn ignition switch"ON".
•Harness foropen or
4. Check voltage between terminal
@
shortbetween heated
and ground. oxygensensorand
Voltage: Batteryvoltage fuse
If NG, repair harness or
OK connectors.
CHECK OUTPUT SIGNALCIRCUIT. NG
Repair harness orcon-
1. Turn ignition switch"OFF".
-----...

nectors.
2. Disconnect ECMharness connector.
3, Check harness continuity between
terminal
G)
and ECM terminal
@

(For Europe andIsrael) orGill (For
Australia
AfT
models) .
Continuity shouldexist.
If OK, check harness forshort.

t
OK

SEF180R
SEF646P
SEF181R

~i5

cilltD

@:
ForAustralia NTmodels

@:
ForEurope andIsrael

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S) (Cont'd)
@
~
~

I;) ~i5

Il
ECM
'QcoNNECTORII

46 19

For Europe andIsrael, andGA15DE.L.J
engine models
Engineground
@,
@

----- \
~ ~
'1

\
.~

,~\ C/

Power steering",
fluid reservoir __\ ~

W~
:'C"",,

EC-192

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS

Heated Oxygen Sensor(H02S)(Cont'd)

@

Loosen andretighten engineground
screws.

OK

CHECK COMPONENT
(Heated oxygensensorheater).
Refer to"COMPONENT INSPECTION"
below.

OK

Disconnect andreconnect harnesscon-
ne~tors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.
Troubleisnot fixed.
Replace heatedoxygen sensor.

COMPONENT INSPECTION NG

Replace heatedoxygen
sensor.

•

DISCONNECT
I~J

00
SEF586Q
Heated
oxygen sensorheater

Check resistance betweenterminals
@
and
CD.

Resistance: 2.3-4.3Q at25°C (77°F)

Check continuity betweenterminals @and
CD,
@
and @.

Continuity shouldnotexist.

If NG, replace theheated oxygen sensor.
CAUTION:

• Discard anyoxygen sensorwhichhasbeen dropped from
a height ofmore than0.5m(19.7 in)onto ahard surface
such asaconcrete floor;useanew one.

EC-193