system NISSAN TERRANO 2004 Service Repair Manual

Performance Test Diagnoses
INSUFFICIENT COOLING
MHA176B
DIAGNOSES Ð Overall System
HA-32
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TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
Whenever abnormal pressure of high and/or low sides of the system is noted, diagnosis must be conducted
by using a manifold gauge. The large-line zone on the gauge scale (see illustrations.) shown in the following
table refers to the standard (normal) pressure range for the corresponding pressure side (high or low). Since
the standard (normal) pressure, however, differs from vehicle to vehicle, refer to the ªAmbient air temperature-
to-compressor pressure tableº.
Gauge indicationRefrigerant cycleProbable causeCorrective action
Both high- and low-pressure
sides are too high.
AC359A
I Pressure is reduced soon
after water is splashed on
condenser. Excessive refrigerant charge in
refrigeration cycle
Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by radiator or con-
denser fan is insufficient. Insufficient condenser cooling
performance
"
q
1Condenser fins are
clogged.
q
2Improper rotation of radiator
fan or condenser fan I
Clean condenser.
I Check and repair radiator or
condenser fan as necessary.
I Low-pressure pipe is not
cold.
I When compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2 kg/cm
2, 28 psi). It
then decreases gradually
thereafter. Poor heat exchange in con-
denser
(After compressor operation
stops, high pressure
decreases too slowly.)
"
Air in refrigeration cycle Evacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems mal- function.Check and repair each engine
cooling system.
I Areas near low-pressure
pipe connection and service
valves are considerably cold
compared with areas near
expansion valve outlet or
evaporator.
I Plates are sometimes cov-
ered with frost. I
Excessive liquid refrigerant
on low-pressure side
I Excessive refrigerant dis-
charge flow
I Expansion valve is open a
little compared with the
specification.
"
q
1Improper expansion valve
installation
q
2Improper expansion valve
adjustment Replace expansion valve.
DIAGNOSES Ð Overall System
Performance Test Diagnoses (Cont'd)
HA-33
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Gauge indicationRefrigerant cycleProbable causeCorrective action
High-pressure side is too high
and low-pressure side is too low.
AC360A
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot. High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.I
Check and repair or replace
malfunctioning parts.
I Check compressor oil for
contamination.
High-pressure side is too low
and low-pressure side is too
high.
AC356A
High- and low-pressure sides
become equal soon after com-
pressor operation stops. Compressor pressure opera-
tion is improper.
"
Damages inside compressor
packings Replace compressor.
No temperature difference
between high- and low-pres-
sure sides Compressor discharge capac-
ity does not change. (Com-
pressor stroke is set at maxi-
mum.)Replace compressor.
Both high- and low-pressure
sides are too low.
AC353A
I There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.
I Liquid tank inlet and expan-
sion valve are frosted. Liquid tank inside is clogged a
little.
I
Replace liquid tank
I Check compressor oil for
contamination.
I Temperature of expansion
valve inlet is extremely low
as compared with areas near
liquid tank.
I Expansion valve inlet may
be frosted.
I Temperature difference
occurs somewhere in high-
pressure side High-pressure pipe located
between liquid tank and
expansion valve is clogged.
I
Check and repair malfunc-
tioning parts.
I Check compressor oil for
contamination.
DIAGNOSES Ð Overall System
Performance Test Diagnoses (Cont'd)
HA-34
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Gauge indicationRefrigerant cycleProbable causeCorrective action
Both high- and low-pressure
sides are too low.
AC353A
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted. Expansion valve closes a little
compared with the specifica-
tion.
"
q
1Improper expansion valve
adjustment
q
2Malfunctioning expansion
valve
q
3Outlet and inlet may be
clogged. I
Remove foreign particles by
using compressed air.
I Check compressor oil for
contamination.
I Replace expansion valve.
Areas near low-pressure pipe
connection and service valve
are extremely cold as com-
pared with areas near expan-
sion valve outlet and evapora-
tor. Low-pressure pipe is clogged
or crushed.
I
Check and repair malfunc-
tioning parts.
I Check compressor oil for
contamination.
Air flow volume is not enough
or is too low. Evaporator is frozen.
"
Compressor discharge capac-
ity does not change. (Com-
pressor stroke is set at maxi-
mum length.) Replace compressor.
Low-pressure side sometimes
becomes negative.
AC354A
I Air conditioning system does
not function and does not
cyclically cool the compart-
ment air.
I The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted. Refrigerant does not discharge
cyclically.
"
Moisture is frozen at expan-
sion valve outlet and inlet. "
Water is mixed with refrigerant. I
Drain water from refrigerant
or replace refrigerant.
I Replace liquid tank.
DIAGNOSES Ð Overall System
Performance Test Diagnoses (Cont'd)
HA-35
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Gauge indicationRefrigerant cycleProbable causeCorrective action
Low-pressure side becomes
negative.
AC362A
Liquid tank or front/rear side of
expansion valve's pipe is
frosted or dewed. High-pressure side is closed
and refrigerant does not flow.
"
Expansion valve or liquid tank
is frosted. After the system is left at rest,
start it again in order to con-
firm whether or not problem is
caused by water or foreign
particles.
I
If the problem is due to
water, drain water from
refrigerant or replace refrig-
erant.
I If it is due to foreign
particles, remove expansion
valve and remove them with
dry and compressed air.
I If either of the above meth-
ods cannot correct the
problem, replace expansion
valve.
I Replace liquid tank.
I Check compressor oil for
contamination.
DIAGNOSES Ð Overall System
Performance Test Diagnoses (Cont'd)
HA-36
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Harness Layout for A/C System
LH DRIVE MODELS
RHA342I
TROUBLE DIAGNOSES
HA-40
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RH DRIVE MODELS
RHA343I
TROUBLE DIAGNOSES
Harness Layout for A/C System (Cont'd)HA-41
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Main Power Supply and Ground Circuit Check
POWER SUPPLY CIRCUIT CHECK FOR A/C SYSTEM
Check power supply circuit for air conditioning system.
Refer to ªPOWER SUPPLY ROUTINGº in EL section and ªWir-
ing Diagramº.
TROUBLE DIAGNOSES
HA-52
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Diagnostic Procedure 3
SYMPTOM: Intake door does not change.
CHECK OPERATION
Does intake door motor (recirculation sys-
tem) operate, correctly?
NG
EOKIntake door motor (recir-
culation system) is OK.
CHECK POWER SUPPLY A/C CONTROL
PANEL
Disconnect A/C control panel harness con-
nector.
Do approx. 12 volts exist between A/C panel
harness connector terminal q
1and body
ground?
OK
ENG CHECK POWER SUP-
PLY CIRCUIT AND 10A
FUSE.
(Refer to ªPOWER
SUPPLY ROUTINGº in
EL section and Wiring
Diagram).
CHECK POWER SUPPLY FOR INTAKE
DOOR MOTOR
ITurn ignition switch ON.
Check voltage between intake door motor
terminal q
1and ground, a few seconds after
air recirculation switch is switched ON.
Do approx. 12 volts exist?
Check voltage between intake door motor
terminal q
2and ground, a few seconds after
air recirculation switch is switched OFF.
Do approx. 12 volts exist?
OK
ENG Check continuity
between intake door
motor terminal q
1(q2)
and A/C control panel
terminal q
10(q11).
If NG, repair harness or
connector.
OK
Replace A/C control
panel.
CHECK INTAKE DOOR MOTOR
Apply approx. 12 volts between intake door
motor terminals q
1(q2) and q2(q1).
Does intake door motor operate, correctly?
OK
ENG Replace intake door
motor.
CHECK INTAKE DOOR LINKAGE
(Refer to ªControl Linkage Adjustment,
HA-64.)
If OK, intake door is OK.ENGRepair intake door link-
age.
YHA429
YHA430
YHA431
YHA432
H
H
H
H
H
TROUBLE DIAGNOSES
HA-60
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General Specifications
COMPRESSOR
ModelDKS-17CH
Type Swash plate
Displacement cm
3(cu in)/Rev 168 (10.25)
Direction of rotation Clockwise
(Viewed from drive end)
Drive belt A type
LUBRICATION OIL
ModelZEXEL make
DKS-17CH
Name Nissan A/C System Oil
Type S
Part number KLH00-PAGS0
Capacity m (Imp fl oz)
Total in system TD ENGINE: 250 (8.8)
ZD ENGINE: 200 (7.0)
Compressor (Service parts)
charging amount TD ENGINE: 250 (8.8)
ZD ENGINE: 200 (7.0)
REFRIGERANT
Type
R134a
Capacity kg (lb) 0.60 - 0.70 (1.32 - 1.54)
Inspection and Adjustment
ENGINE IDLING SPEED
When A/C is ON
Refer to EF & EC section.
BELT TENSION
Refer to Checking Drive Belts (MA section).
COMPRESSOR
Model DKS-17CH
Clutch disc-to-pulley clearance mm (in)0.3 - 0.6
(0.012 - 0.024)
SERVICE DATA AND SPECIFICATIONS (SDS)
HA-65
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