1995 NISSAN ALMERA N15 Service Manual

TROUBLEDIAGNOSES
How toPerform TroubleDiagnoses forQuick
and Accurate Repair
WORK FLOW
_________C_H_EI_K_I_N
I
+-1
Reference item

.--------------,

ELIMINATE GOODSYSTEM(S)/PART(S).
INVESTIGATE
IT-EMSYOUSHOULD CARRYOUT
RELATED TOEACH SYMPTOM.
CHECK MAINPOWER SUPPLY ANDGROUND CIR-
CUITS. LISTEN
TOCUSTOMER COMPLAINT ANDCONFIRM BY
PERFORMING OPERATIONAL CHECK. Operational
check

+-
(Refer toHA-16.)
Symptom Chart(Refer
to HA-18.)
Symptom Chart

+-
(Refer toHA-18.)

+-
Preliminary Check
(Refer toHA-20.)

+-
MainPower Supply and
Ground CircuitCheck
(Refer toHA-49.)
Harness layout(Referto

+-
HA-31.)
Malfunctioning
part(s)
Malfunctioning
harness( es)/
connector(s)
ELIMINATE
GOODPART(S)/HARNESS(ES)/
CONNECTOR(S) ELECTRICALLY.
•
Diagnostic Proce-
dure(s) (Referto
HA-50.)
• Circuit Diagram
(Refer toHA-34.)
NG
I

REPAIR. INSPECT
EACHCOM-
PONENT.
FINAL CHECK Electrical
Components

+-
Inspection
(Refer toHA-62.)

•

CHECK OUT
HA-15

TROUBLEDIAGNOSES
Operational Check

The purpose ofthe operational checkisto confirm thatthesys-
tem operates asitshould. Thesystems whicharechecked are
the blower, mode(discharge air),intake air,temperature
decrease, temperature increase.

CONDITIONS:
Engine running atnormal operating temperature.
RHA315F
RHA316F

Discharge airflow

Switch Airoutlet/distribution
model RHDmodels
LHDmodels
indicator FaceFootDefroster FaceFoot
Defroster

_e
100% 100%

II
-

- -
-

"#Ie
60%
40%

-
60%
40%
-

"J
-

80%
20%14%
65% 21%

,, -

60% 40%
13%57%
30%

W
-

-

100%
-
-
100%
RHA317F PROCEDURE:
1. Check blower

1) Turn fancontrol knobto1-speed.
Blower shouldoperate on1-speed.
2) Then turnfancontrol knobto2-speed.
3) Continue checking blowerspeeduntilallfour speeds are
checked.
4) Leave blower on4-speed.

2. Check discharge air.

1) Turn mode control knob.
2) Confirm thatdischarge aircomes outaccording tothe air
distribution tableatleft.
Refer to"Discharge AirFlow" in"DESCRIPTION" (HA-12).

HA-16

RHA318F
4.Check temperature decrease

~~ ~~~nC~ef~~~~~~ur~ cont:olknobtofull cold.
air atdischarge airoutlets.

TROUBLE
DIAGNOSES
Operational Check(Cont'd)

3. Check recirculation

1) Pre~s recirculation switch.
2) ~.eclrculati~n indicatorshouldlight
Isten forIntake doorposition ch'an
blower soundchange slightly). ge(you should hear

RHA319F
5.Check temperature increase

~~ ~~rn ~efmperatu:e controlknobtofull hot
ec orhot airatdischarge airoutlets:

RHA320F
6.Check airconditioner switch

Turn fancontrol knobtothe desired 1
a~? push theairconditioner 'th (to 4-speed) position
dltlOner.
SWI
ctoturn ONtheaircon-
The indicator lightshould com .
ON. eon when airconditioner is

•

RHA321F
HA-17

TROUBLEDIAGNOSES
Symptom Chart
DIAGNOSTIC TABLE

MainPower
PROCEDURE Preliminary
DiagnosticSupplyand
Check ProcedureGroundCircuit
Check
REFERENCE PAGE
0

N
N

C')

0 N

"'"
O'J
O'JO'J

N NN

LO LO
LO

"'""'""'"

.d: .d:.d: .d:.d:
I

.d: .d:.d:
.d:

~
:c :c:c :c
:c :c:c :c:c:c
~
N
C')

Q) Q)Q)

ci.

~

N
C')

"'" ....
....
....

:J :J:J

E
-'" -'"-'" -'"
"0
"0"0

u uu u
Q)Q) Q)
«l

Q) Q)Q) Q)

uuu

e

.c
.c.c .c

000

u uu u
....
........

>.
~
>.
>.
0.
0.0.

C
~
....
....

uu u

UJ UJ
0

«l «l
«l

~ ~~
OJ

Q)
u

c cc
c

UJUJ

0

.-
.-
.-

000

:J

.2
E E
E E

ccc

u..
E

SYMPTOM
.-

-
.

-

OJOJOJ
~
....

~
OJ

Qj
Qj

«l«l
«l
~ Q)

.... .... ....

Ci Ci Ci
LO
LO

.c

a.. a..a..
a..
~

r--
f-

AIC
does notblow coldair.

0
0
0
0
00

Blower motordoesnotrotate.

0
fj
()

Insufficient heating

0
()

Air outlet doesnotchange.

0

Intake doordoes notchange.

0
0
0

Magnet clutchdoesnotoperate when

0
fj

0
0
0

AIC
switch andfanswitch areON.
Noise
0

0,
fj:
The number meanschecking order.

C :
As for checking order,refertoeach flowchart. (Itdepends onmalfunctioning portion.)

HA-18

TROUBLEDIAGNOSES
Symptom Chart(Cont'd)

Electrical Components Inspection

cc

0
.Q

.8
on

.8
tl

C\J
C')
C')C')

C\J-.r
C')

-.r
C')

....
Q)

....
Q)

CD CD
CDCD
CDCD CDCD
CD

Q)
CfJ

Q)

CfJ

I

Qj
Qj

«
0-l

I

I
I IIII III

a::
w
a::
w

Q)
:J

"'0
0

E

.

~
c
0

(.)

Q)

c

Ol

c

~

....
~

0
0

CfJ
W

CfJ

Q) Q)

....

a.
:J

E
"'0

0
0

ci.
r.

0

E

r.
.B
E

.B
E

.~
....

~

.~
crl

0

C Q)

....
-
CfJ

tl
tl

0
CfJ

0
Q) Q)
0

>.

.... ....
(.)

CfJ

0
~
c

C
....

(5
(5
0

:J

....
(/J

c

CfJ
r.

:;
r.

0
CfJ

a.
0
0

E
Q)

.B .B
>.

(.)

CfJ

0
.~

....

crl
Q)

Ci3
CfJ

.... ....
.~

:J

.~

OJ
0

....

w
CfJ

Q) Q)
~
E

9-

E
c

Q)

CfJ CfJ
....

~ ~
....

Ci3
~
E
c

0
(.)

c
0
Q)
Q)
....

0
0

OJ
crl
r.
:J

r.
0
:J

crl

iii iii
;;:

;;:
-

a::
LL

I-
0

I-
W
-
I

-

()
0 0
0
0
0
()

00
0

0
0
0
()

0 0

()
0
0 0
(::

0
()
(0)

() ()

HA-19
•

TROUBLEDIAGNOSES
Preliminary Check
PRELIMINARY CHECK1

Ale
does notblow coldair.
DOESAIRFLOW FROM VENTS?
Condition
• Engine running atoperating tem-
perature .
• Ignition switch,AICswitch, and
fan switch areON.
• Mode control knobisin VENT
mode andtemperature control
knob isinfull cold position.
Yes IS
BLOWER MOTOROPERATING
NORMALLY?
Yes
CHECKBLOWER
MOTOR OPERATION.
Go toDiagnostic Pro-
cedure 1.(HA-50)
CHECK COMPRESSOR BELTTEN-
SION. Refer to"Checking DriveBelts" in
MA section.
CHECK REFRIGERANT.
Connect manifold gaugethen
check system pressure.
Refer toPerformance Chart.(HA-

26)

NG CHECK
THERMO CONTROL AMP.
OPERATION.
Refer toElectrical Components
Inspection. (HA-63)
CHECK
FOREVAPORATOR COIL
FREEZE UP.
Remove intakeunit.Check ifevap-
orator freezes.
NG OK
(Freeze up.) (Doesnot
freeze up.)
CHECK VENTILATOR
DUCT FORAIR
LEAKS.
OK
Go toPerformance
Test Diagnoses. (HA-

24)
NG
CHECK
REFRIGERATION CYCLE
PRESSURE WITHMANIFOLD
GAUGE CONNECTED.
Refer toPerformance Chart.(HA-
26) OK
CHECK
COMPRESSOR OPERA-
TION.
OK
OK NG
Adjust orreplace
compressor belt.
Refer toMA section
("ENGINE
MAINTENANCE").
CHECKFORREFRIG-
ERANT LEAKS CHECK
WATER COCKOPERA-
TION.
Warm upengine beforechecking.
Refer toHA-64.
NG

Adjust orreplace watercock.
OK
Go toDiagnostic Procedure3.
(HA-54) CHECK
TEMPERATURE CONTROL
CABLE.
Refer toControl Linkage Adjust-
ment. (HA-64) NG
Adjust temperature controlcable.
OK
VISUALLY INSPECTAIRMIX
DOOR.
Access byremoving instrument
panel. NG
Replace airmix door.
OK
CHECK THERMO CONTROL AMP.
OPERATION. Refer toElectrical Components
Inspection. (HA-63)
HA-20

PRELIMINARY CHECK2
Air outlet doesnotchange. TROUBLE
DIAGNOSES
Preliminary Check(Cont'd)
TURN IGNITION SWITCHANDFANSWITCH ON.DOES AIR No
Adjustmodecontrol cable.Referto
COME OUTNORMALLY FROMEACHDUCTWHEN EACH HA-64.
MODE SWITCH ISPUSHED?
Discharge airflow
Switch Airoutlet/distribution
model RHOmodels
LHDmodels
indicator FaceFoot
Defroster FaceFoot
Defroster

iI
100%

-

-
100%

-
-

.

,7,./
60%40%

-

60%40%

-

,~
-

80%
20%14%65% 21%

,~
-

60% 40%
13%57% 30%

\tEl
-

-

100%

-
-
100%
res
INSPECTION END
HA-21
•

PRELIMINARY CHECK3
Noise TROUBLE
DIAGNOSES
Preliminary Check(Coni'd)

Check wherenoisecomes from.
I
I

Blower motor
Check fornoise
in all modes and
temperature set-
tings.
I

Compressor
Inspect thecom-
pressor clutch
and pulley and
idler pulley. Expansion
valve
Replace expan-
sion valve.
I

Refrigerant line
II
Belt

I

Noise is
constant.
OK
NG

Check blower
motor forfor-
eign particles.
Check blower
motor andfan
for wear. Replace
compressor
clutch and
pulley.
Refer to
HA-77.
Check disc-to-
pulley clearance.
Refer toHA-79,

82.
OK

Check andadjust
lubricant.
Refer toHA-68.

OK

Replace com-
pressor and
liquid tank. The
lineisfixed
directly tothe
body.
Fix the line with
rubber orsome
vibration absorb-
ing material.
The beltvibra-
tion isintense. The
lineisnot
fixed.
Fix the line
tightly.
Side ofbelt is
worn out.
Noise is
i nterm ittent.
Check airdis-
charge ducts
for obstruc-
tions, foreign
materials or
air leakage.

HA-22
Readjust
belt
tension.
Refer toMA
section ("Check-
ing Drive Belts",
"ENGINE
MAINTENANCE"). The
pulley cen-
ter does not
match.
Readjust thepul-
ley center.