1995 NISSAN ALMERA N15 check engine

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TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Idle AirControl Valve(IACV)-FICD Solenoid
Valve (Cont'd)

@

AEC766 CHECK
GROUND CIRCUIT.

1. Turn ignition switch"OFF".
2. Check harness continuity between
terminal
@
and body ground.

Continuity shouldexist.

If OK, check harness forshort.

OK

CHECK COMPONENT
(IACV-FICD solenoidvalve).
Refer to"COMPONENT INSPECTION"
below.

OK

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

cmD,@

• Harness foropen or
short between IACV-
FICO solenoid valveand
engine ground
If NG, repair harness or
connectors.
Replace IACV-FICD sole-
noid valve.

~i5@d
~
SEF721Q
\ Washer

~~v

err
~S~log
Plunger SEF097K:COMPONENT
INSPECTION
IACV-FICD solenoidvalve

Disconnect IACV-F1CDsolenoidvalveharness connector.
• Check forclicking soundwhenapplying 12Vdirect current
to terminals.
• Check plunger forseizing orsticking.
• Check forbroken spring.

EC-342

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

• COOLING FANCIRCUIT.
DOES
COOLING FAN
ROTATE ANDSTOP
EVERY 3SECONDS
7

NEXT
II
NO
II
YES
I

MEF311F

• ACTIVE TEST.
0

COOLING FAN
OFF

= ==
MONITOR
==
=

COOLAN TEMP/S

HI

With airconditioner
C
k
00lin9fan

Q

~ID~
MEF277G
M/T

models

INSPECTION START

CHECK OVERALL FUNCTION.

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1.Turn ignition switch"ON".
~ 2.Perform "COOLING FAN
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.

OR

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1.Turn ignition switch"ON".

\J!V
2.Select "COOLING FAN"in
"ACTIVE TEST"modewith
CONSULT.
OR

I
With airconditioner
I

1. Start engine.
2. Set temperature leveratfull cold
position.
3. Turn airconditioner switch"ON".
4. Turn blower fanswitch "ON".
5. Run engine atidle forafew minutes
with airconditioner operating.
6. Make surethatcooling fanoperates.

I
Without airconditioner
I

1. Start engine.
2. Keep engine speedatabout 2,000
rpm until engine iswarmed upsuffi-
ciently.
3. Make surethatcooling fanbegins to
operate duringwarm-up.

NG
CHECK POWER SUPPLY.

1. Turn airconditioner switch"OFF".
2. Turn blower fanswitch "OFF"
(Step 1and 2are only performed for
models withairconditi.oner.)
3. Stop engine.
4. Disconnect coolingfanrelay.
5. Turn ignition switch"ON".
6. Check voltage between terminals
G),
@
and ground.

Voltage: Batteryvoltage
OK

@

EC-346 OK
NG
INSPECTION
END
Check thefollowing.
• 30A fusible link
• 10A fuse
• Harness foropen or
short between fuseand
cooling fanrelay
• Harness foropen or
short between battery
and cooling fanrelay
If NG, repair harness or
connectors.

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Cooling FanControl (Cont'd)
AlT models
INSPECTION START
Checkcooling fanlow
speed control circuit.

(Go to

I
PROCEDURE A
I,

EC-350.)
NG
2. Turn ignition switch"ON".
3. Perform "COOLING FAN
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.
OR
2. Turn ignition switch"ON".
3. Perform "COOLING FAN"in
"ACTIVE TEST"modewith
CONSULT. OR
CHECK
COOLING FANLOW SPEED
OPERATION. 1. Disconnect coolingfan
re/ays-2
and
-3.

00

COOLING FAN
ROTATE ANDSTOP
EVERY 3SECONDS
I

•
COOLING FANCIRCUIT.
DOES
OK
NEXT

II
NO
II
YES
JF311F
(j)

I
With airconditioner
I

2. Start engine.
3. Set temperature leveratfull cold
position.
4. Turn airconditioner switch"ON".
5. Turn blower fanswitch "ON".
6. Run engine atidle forafew minutes
with airconditioner operating.
7. Make surethatcooling fanoperates
at low speed.

I
Without airconditioner
1

2. Start engine.
3. Keep engine speedatabout 2,000
rpm until engine iswarmed upsuffi-
ciently.
4. Make surethatcooling fanbegins to
operate atlow speed during warm-
up.
COOLAN
TEMPjS 88°C
•
ACTIVE TEST.
0

COOLING FAN
OFF

= ==
MONITOR
===

With airconditioner
lCOOtingfan

@l

~ID~

==H=I
=11L~W I

EC-348

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.

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

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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

MEC730B
•

INSPECTION
START

DIAGNOSTIC
PROCEDURE
CHECK OVERALL FUNCTION.
~
INSPECTION
END

I

1. Start engine andwarm itup suffi-
ciently.

00
2.
Perform "PW/STSIGNAL
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.
OR

@
2.
Check "PW/ST SIGNAL" in
"DATA MONITOR" modewith
CONSULT.

Steering isin neutral
position: OFF
Steering isturned:
ON
OR

@
2.
Check voltage between ECM
terminal
@
and ground.

Voltage:
When steering wheelis
turned quickly.
Approximately OV
Except above
Approximately 8-10V

~NG

+
-
SEF5911
MEF023E
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS[][]
Power Steering OilPressure Switch(Cont'd)
COMPONENT DESCRIPTION

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

RECORD

NEXT

II
START

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

LOCKED
POSITION
THEN
TOUCH START
-crMONITOR -crNOFAIL
0

PW/ST SIGNAL OFF

Hoodledge
RH~

m
1='
=EC=M
=.,~
CONNECTORII ~
is

43
00

[Y]

.".MEF315F
EC-355

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
mJ

Power Steering OilPressure Switch
(Cont'd)

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II
ECM
~CONNECTORII

43 AEC760
SEF501Q
@

1

CHECK GROUND CIRCUIT. NG
Repair harness orcon-
1. Turn ignition switch"OFF".
--..

nectors.
2. Disconnect powersteering oilpres-
sure switch harness connector.
3. Check harness continuity between
terminal
@
and engine ground.
Continuity shouldexist.
If OK, check harness forshort.
OK

[!J
CHECK INPUTSIGNAL CIRCUIT. NG
Check thefollowing.
1. Disconnect ECMharness connector.
--..

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

ECM terminal
@
and terminal
CD.
•
Harness connectors
Continuity shouldexist.
@,@D

If OK, check harness forshort. •
Harness foropen or
OK short
between ECMand
power steering oilpres-
sure switch
If NG, repair harness or
connectors.

Power steering oilpressure switch

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

~
to
ID

~
CHECK
COMPONENT
(Power steering oilpressure switch).
Refer to"COMPONENT INSPECTION"
below.

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

COMPONENT INSPECTION

Conditions
Steering wheelisbeing turned
Steering wheelisnot being turned NG
Replace powersteering
oil pressure switch.
Continuity
Yes
No
AEC762
IfNG, replace powersteering oilpressure switch.

EC-356

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
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ECM
-er
CONNECTOR
II

19
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~
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

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cillID
MEC783B

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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