1995 NISSAN ALMERA N15 Service Manual

IACV-AACvalve

Disconnect IACV-AACvalveharness connector.
• Check IACV-AAC valveresistance.
Resistance: Approximately 100[at25°C (77°F)]
• Check plunger forseizing orsticking.
• Check forbroken spring.

MEC770B

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)

COMPONENT INSPECTION
EC-338

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[]K]

Idle AirControl Valve(IACV)-FICD Solenoid
Valve

EC-FICD-01

~
G

1 _
•

Refer
toEL-POWER.

I

L/R

1$l
m
(E202)

L/R

I
Tocompressor
.- L/R
+
(Refer to

I
HA-A/C.)

L/R

~ IACV-

FICO

SOLENOID VALVE

lbi=Jl
CE212)

B

1$1
(E227)

([g)

~ TOECM

• +
(ECCS
- B/Y
contro
1

I
r-J
module)

B/Y
BB

t.J
1

ill)

G
~Next page
FUSE
BLOCK
(JIB)

@
L/Y
(El06)
I

~
LIB L!Y

!~
rn~
AIR

I
~12g~~~TIONER

-I ........~ -I
--~I-~~I
«@

Y L/R

I.
I

~ Y
JA---..
Next
.",........- page
To
A/C
switch
GY
+
(Refer to
HA-A/C. )
THERMO
CONTROL
AMPLIFIER

lMW

OUAL-
PRESSURE
SWITCH

@

~t

LOW HIGH

.... ~r-.

NORMAL
_. Detectable line
for oTC
-: Non-detectable
line foroTC
THERMISTOR

A«@

T
L
~
(E202)

rIDm:IID
B
~
(E212) ~
([g)

UJ.g)
GY~ GY
~~
2 W

3
Refer
tolast page
(Foldout page).

CHID
{EtOn

,

@
(El06)

,

JS2L~

w.g)
B
EC-339 HEC021

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[]K]

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

EC-FICD-02

Preceding
page
<@-6

<&Y
-:
Detectable line
for DTC
-: Non-detectable
line forDTC

Y 6

r=bCE101) ~

116Al~ ---- - --- -- ~f38l1

'-T"' eM[)
'T'

Y 6
Y
@
6

II~~-~~-------~rihl
~@
T

t

Y

din

ACRLY
6

rF41i1
AIR ECM
CON (ECCS
CONTROL
MODULE)

em

Refertolast page
(Foldout page).

(MS)

,

EC-340
em

L

HEC022

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

~i5

cf0
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
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)

BATTERY (Via
fusible link)

M/T
models

FUSE
BLOCK
(JIB)

(El06) 30A

o
EC-COOL/F-01

Refer toEL-POWER.

@:
Models withairconditioner
... :Detectable line
for DIC
-: Non-detectable
line forOle

IIQ~OI

GY

BR
I

I
1--

BR GY

II!
]11
COOLING

n
FAN

u
RELAY-1

1biJ1bi=Jl@

LG/R
G/B

I
1----
0--
1

LG/R
I

r=::!=
G/BG/B

I~I(][)
mm

LG/R ~COOLING ~COOLING

I
FANFAN

M
MOTOR-l
M
MOTOR-2
LG/R (E45)
rn

II-t-JI(M49) ~~
@

+@
BB

LrR
l-------6

LG/R
I

m
e.
1

- I
ECM
RFRL
(ECCS BB
CONTROL
..L_..L_

MODULE)

------ em
ern>
@D

+

2 1 L

5
~@~

lJ.l.g)
GY,GY
Refer
tolast page

(Foldout page).

@
(El0t)
,
(El06)
EC-344
em

L

HEC016

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

•

t
t

EC-COOL/F-02

COOLING
FAN

MOTOR-2

rn

@
tt

@:

Models withair
conditioner
... :Detectable line
for DTC
-: Non-detectable
line forDTC

____ r~-,

S S

-!- -!-

~

Refer
to

EL-POWEA.
ECM (ECCS
CONTROL

MODULE)

(IT)

i0A
FUSE
~.jffil

I
25
I
~~9~f
30A30A

(El06)
IT]
IT]

GY G/W

• --1

-~-,-I-FO~=-_I
I

SR GYG/W SRGYLG/S SAG/WLG/R

COOLINGII:!:I :!i':]JII COOLINGI':}:' ':f]1I:[]II COOLING/I:!:I 1:f]1':[]II

~~~AY-i ~~~~~AY-2 ~~~~~AY-3 ~~

(ffi) ~~ ~
rn ~
lbiJ
U+!J
~iC8) ~
lbiJ~

LG/R G/8G/A LGG/Y 8
@
LGG/OR S

I~ -
-tr=-
!-.J
_I _
I--~

LG ~LG/R
I

r:::::k,{jQj;r:::::k,

114.J
I~---
-l13.J
II
G/R
LG ~LG/R
wT1

I I
~~~LING~)

MOTOR-1

LG (M49) LG/R ~

1t!J~
-F6-
~cPl

LG
CEID
LG/R

I ~
1~

LG LG/R

rrToi1
rm

AFAH RFRL

AIT
models

IGNITION SWITCH
ON
or
STAAT
~ (Ei2),(Ei7),(Ei8)
~ SRSRSR ~
(E40),(E46)

t::mJ
GYGY
Refer
tolast page
(Foldout page).

~ (El0!)

,

(El06)

em
L

HEC017
EC-345