1995 NISSAN ALMERA N15 stop start

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Idle AirControl Valve(IACV)-Air Regulator
SYSTEM DESCRIPTION
Camshaft positionsensor
Ignition switch Engine
speed
Start signal ECM
(ECCS
control
module) IACV-air
regulator

The IACV-air regulator iscontrolled bythe ECM
at the same timeasfuel pump ON-OFF control.
Condition
Ignition switchisturned to"ON"
Engine running andcranking
When engine isstopped
Except asshown above IACV-air
regulator
operation
Operates for5
seconds
Operates
OFF in1second
OFF

Bimetal

...

Air flow
SEF095K COMPONENT
DESCRIPTION

IACV-air regulator providesanair bypass whentheengine ;s
cold forafast idleduring warm-up.
A bimetal, heaterandrotary shutter arebuilt intotheIACV-air
regulator. Whenthebimetal temperature islow, theairbypass
port opens. Asthe engine startsandelectric currentflows
through aheater, thebimetal beginstoturn theshutter toclose
the bypass port.Theairpassage remainscloseduntilthe
engine stopsandthebimetal temperature drops.

EC-332

•IGN TIMING ADJ.
0

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)
DIAGNOSTIC PROCEDURE
-- CONDITION SETIING--
IGN/T FEEDBACK HOLD INSPECTION
START

~i5 ~i5

ECM
E[CONNECTORII
cffb

113

=
= =
MONITOR
CAS. RPM (REF)
IGN TIMING
IDLE POSITION
---
---

800rpm
15BTDC
ON
SEF786KA
MEC768B CHECK
OVERALL FUNCTION.
1. Start engine andwarm itup suffi-
ciently.
2. Check idlespeed.

800::1:50
rpm
If NG, adjust idlespeed. (Referto
(l)
e
EC-243.)
3. .. •Perform "IGNTIMING ADJ"

I!I
in"WORK SUPPORT" mode
with CONSULT.
~ •Disconnect IACV-AACvalve

5
harness connector.
4. Ma esure thatidlespeed drops.
Does notdrop
CHECK POWER SUPPLY.
1. Stop engine.
2. Disconnect IACV-AACvalveharness
connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
G)

and ground withCONSULT ortester.
Voltage: Batteryvoltage
OK

[!1
CHECK OUTPUT SIGNALCIRCUIT.
1. Disconnect ECMharness connector.
2. Check harness continuity between
ECM terminal
CTID
andterminal
(2).

Continuity shouldexist.
If OK, check harness forshort
OK
CHECK COMPONENT
(IACV-AAC valve).
Refer to"COMPONENT INSPECTION"
on next page.
OK Drops
NG
NG
NG INSPECTION
END
Check thefollowing .
• Harness connectors

@D,
([ill)(M/Tmod-
els)
• Harness connectors

@,
@
(A/T
models)
• 7.5A fuse
• Harness foropen or
short between IACV-
AAC valve harness con-
nector andfuse
If NG, repair harness or
con nectors.
Check thefollowing.
• Harness connectors

@,@D

• Harness foropen or
short between ECMand
IACV-AAC valve

If
NG, repair harness or
connectors.
Replace IACV-AAC valve.
•

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-337

MEF023D
•

Refer to"TROUBLE
DIAGNOSES"
i!1
HA sec-
tion. INSPECTION
END
Check thefollowing.
• Harness connectors

@D,@!)

• Harness foropen or
short between IACV-
FICO solenoid valve
harness connector and
air conditioner relay
If NG, repair harness or
connectors.

OK
NG
NG
CHECK
OVERALL FUNCTION.

1. Start engine andwarm itup suffi-
ciently.
2. Check idlespeed.

800:1::50
rpm

If NG, adjust idlespeed.
3. Turn airconditioner switchand
blower fanswitch "ON".
4. Recheck idlespeed.

850 rpm ormore

Check ifair conditioner compressor
functions normally.

DIAGNOSTIC
PROCEDURE
OKNG
OK

INSPECTION
START

CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect IACV-FICDsolenoidvalve
harness connector.
3. Start engine, thenturnairconditioner
switch andblower fan"ON".
4. Check voltage between terminal
CD

and ground withCONSULT ortester.

Voltage: Batteryvoltage
AEC765
MEF634E
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[]liJ

Idle AirControl Valve(IACV)-FICD Solenoid
Valve (Cont'd)
COMPONENT DESCRIPTION

When theairconditioner ison, the IACV-FICD solenoidvalve
supplies additional airtoadjust tothe increased load.
Idle
adjusting
screw

EC-341

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.

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

OR

rij\
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.

(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
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