NISSAN ALMERA N16 2003 Electronic Repair Manual

RHA638H
ELECTRICAL COMPONENT INSPECTIONNJHA0192A/C RelayNJHA0192S01Check continuity between terminal Nos. 3 and 5.
Conditions Continuity
12V direct current supply between terminal Nos. 1 and 2 Yes
No current supply No
If NG, replace relay.
RHA272I
SHA315FD
Refrigerant Pressure SensorNJHA0192S02Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operat-
ing condition figure.
Check voltage between ECM harness terminal No. 69 and body
ground.
RHA282I
Dual-pressure SwitchNJHA0192S03
ON
kPa (bar, kg/cm2, psi)OFF
kPa (bar, kg/cm2, psi)
Low-pressure
sideIncreasing to 157 - 216 (1.57 -
2.16, 1.6 - 2.2, 23 - 31)Decreasing to 157 - 196 (1.57
- 1.96, 1.6 - 2.0, 23 - 28)
High-pressure
sideDecreasing to 1,863 - 2,256
(18.6 - 22.6, 19 - 23, 270 -
327)Increasing to 2,452 - 2,844
(24.5 - 28.4, 25 - 29, 356 -
412)
RHA268I
A/C SwitchNJHA0192S04Check continuity between terminals.
A/C switch Terminals Continuity
ON1-7
Ye s
1-8
OFF1-7
No
1-8
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TROUBLE DIAGNOSESMANUAL
Magnet Clutch (Cont’d)
HA-65

Insufficient Cooling
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING=NJHA0148SYMPTOM:
Insufficient Cooling.
INSPECTION FLOW
NHA390
*1: HA-43
*2: HA-71
*3: HA-67*4: HA-35
*5: HA-34
*6: HA-82*7: EM-11 (QG),
EM-11 (YD)
*8: EC-324 or EC-596 (QG),
EC-130 (YD)
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling
HA-66

PERFORMANCE TEST DIAGNOSESNJHA0149
RHA281I
*1: HA-69
*2: HA-69*3: HA-71 *4: HA-44
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TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-67

SHA361FA
*1: HA-85 *2: HA-45 *3: EM-11 (QG),
EM-11 (YD)
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-68

PERFORMANCE CHART=NJHA0150Test ConditionNJHA0150S01Testing must be performed as follows:
Vehicle location: Indoors or in the shade (in a well-ventilated place)
Doors: Closed
Door window: Open
Hood: Open
TEMP.: Max. COLD
Discharge Air: Face Vent
REC switch: (Recirculation) set
FAN speed: High speed
Engine speed: Idle speed
Operate the air conditioning system for 10 minutes before taking
measurements.
Test Reading (Gasoline Engine)NJHA0150S02Recirculating-to-discharge Air Temperature TableNJHA0150S0201
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center venti-
lator
°C (°F) Relative humidity
%Air temperature
°C (°F)
50 - 6025 (77) 10.0 - 11.6 (50 - 53)
30 (86) 13.9 - 16.2 (57 - 61)
35 (95) 17.8 - 21.4 (64 - 71)
60 - 7025 (77) 11.6 - 13.9 (53 - 57)
30 (86) 16.2 - 18.9 (61 - 66)
35 (95) 21.4 - 24.5 (71 - 76)
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TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-69

Ambient Air Temperature-to-operating Pressure Table=NJHA0150S0202
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2, psi)Low-pressure (Suction side)
kPa (bar, kg/cm2, psi) Relative humidity
%Air temperature
°C (°F)
50 - 7030 (86)980 - 1,180
(9.8 - 11.8, 9.99 - 12.04,
142 - 171)230 - 270
(2.3 - 2.7, 2.35 - 2.75, 33 - 39)
35 (95)1,180 - 1,390
(11.8 - 13.9, 12.04 - 14.18,
171 - 202)260 - 310
(2.6 - 3.1, 2.65 - 3.16, 38 - 45)
40 (104)1,400 - 1,580
(14.0 - 15.8, 14.28 - 16.12,
203 - 229)300 - 350
(3.0 - 3.5, 3.06 - 3.57, 44 - 51)
Test Reading (Diesel Engine)NJHA0150S03Recirculating-to-discharge Air Temperature TableNJHA0150S0301
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center venti-
lator
°C (°F) Relative humidity
%Air temperature
°C (°F)
50 - 6020 (68) 6.5 - 9.0 (44 - 48)
25 (77) 12 - 14 (54 - 57)
30 (86) 15.5 - 18.8 (60 - 66)
35 (95) 20.4 - 24.0 (69 - 75)
60 - 7020 (68) 9.0 - 11.0 (48 - 52)
25 (77) 14.0 - 16.5 (57 - 62)
30 (86) 18.8 - 21.5 (66 - 71)
35 (95) 24 - 27 (75 - 81)
Ambient Air Temperature-to-operating Pressure TableNJHA0150S0302
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2, psi)Low-pressure (Suction side)
kPa (bar, kg/cm2, psi) Relative humidity
%Air temperature
°C (°F)
50 - 7020 (68)765 - 922
(7.65 - 9.22, 7.8 - 9.4,
111 - 134)177 - 226
(1.77 - 2.26, 1.8 - 2.3, 26 - 33)
25 (77)922 - 1,020
(9.22 - 10.20, 9.4 - 10.4,
134 - 148)196 - 245
(1.96 - 2.45, 2.0 - 2.5, 28 - 36)
30 (86)1,177 - 1,451
(11.77 - 14.51, 12.0 - 14.8,
171 - 210)235 - 284
(2.35 - 2.84, 2.4 - 2.9, 34 - 41)
35 (95)1,373 - 1,667
(13.73 - 16.67, 14 - 17,
199 - 242)275 - 333
(2.75 - 3.33, 2.8 - 3.4, 40 - 48)
40 (104)1,618 - 1,961
(16.18 - 19.61, 16.5 - 20.0,
235 - 284)333 - 392
(3.33 - 3.92, 3.4 - 4.0, 48 - 57)
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-70

TROUBLE DIAGNOSES FOR UNUSUAL PRESSURENJHA0151Whenever system’s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) pressure, however, differs from vehicle to vehicle, refer toHA-70 (“Ambient air temperature-to-
operating pressure table”).
Both High- and Low-pressure Sides are Too High.NJHA0151S01
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high and low-pressure sides
are too high.
AC359A
Pressure is reduced soon
after water is splashed on
condenser.Excessive refrigerant charge
in refrigeration cycleReduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance
"
1. Condenser fins are
clogged.
2. Improper fan rotation of
cooling fanClean condenser.
Check and repair cooling
fan as necessary.
Low-pressure pipe is not
cold.
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2.0
bar, 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 cycleEvacuate repeatedly and
recharge system.
Engine tends to overheat. Engine cooling systems mal-
function.Check and repair each
engine cooling system.
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
Plates are sometimes cov-
ered with frost.Excessive liquid refrigerant
on low-pressure side
Excessive refrigerant dis-
charge flow
Expansion valve is open a
little compared with the
specification.
"
1. Improper expansion valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
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TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-71

High-pressure Side is Too High and Low-pressure Side is Too Low.NJHA0151S02
Gauge indication Refrigerant cycle Probable cause Corrective 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.Check and repair or
replace malfunctioning
parts.
Check lubricant for con-
tamination.
High-pressure Side is Too Low and Low-pressure Side is Too High.NJHA0151S03
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.
AC356A
High and low-pressure sides
become equal soon after
compressor operation stops.Compressor pressure opera-
tion is improper.
"
Damaged inside compressor
packingsReplace compressor.
No temperature difference
between high and low-pres-
sure sidesCompressor pressure opera-
tion is improper.
"
Damaged inside compressor
packings.Replace compressor.
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-72

Both High- and Low-pressure Sides are Too Low.NJHA0151S04
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.
AC353A
There is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.
Liquid tank inlet and
expansion valve are
frosted.Liquid tank inside is slightly
clogged.Replace liquid tank.
Check lubricant for con-
tamination.
Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
Expansion valve inlet may
be frosted.
Temperature difference
occurs somewhere in high-
pressure sideHigh-pressure pipe located
between receiver drier and
expansion valve is clogged.Check and repair malfunc-
tioning parts.
Check lubricant for con-
tamination.
Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge
"
Leaking fittings or compo-
nentsCheck refrigerant for leaks.
Refer to “Checking Refriger-
ant Leaks”, HA-92.
There is a big temperature
difference between expansion
valve inlet and outlet while
the valve itself is frosted.Expansion valve closes a little
compared with the specifica-
tion.
"
1. Improper expansion valve
adjustment
2. Malfunctioning expansion
valve
3. Outlet and inlet may be
clogged.Remove foreign particles
by using compressed air.
Check lubricant for con-
tamination.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.Check and repair malfunc-
tioning parts.
Check lubricant for con-
tamination.
Air flow volume is not enough
or is too low.Evaporator is frozen. Replace compressor.
Low-pressure Side Sometimes Becomes Negative.NJHA0151S05
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
AC354A
Air conditioning system
does not function and
does not cyclically cool the
compartment air.
The system constantly
functions for a certain
period of time after com-
pressor is stopped and
restarted.Refrigerant does not dis-
charge cyclically.
"
Moisture is frozen at expan-
sion valve outlet and inlet.
"
Water is mixed with refriger-
ant.Drain water from refriger-
ant or replace refrigerant.
Replace liquid tank.
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TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-73

Low-pressure Side Becomes Negative.NJHA0151S06
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
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.Leave the system at rest
until no frost is present. Start
it again to check whether or
not the problem is caused by
water or foreign particles.
If water is the cause, ini-
tially cooling is okay. Then
the water freezes causing
a blockage. Drain water
from refrigerant or replace
refrigerant.
If due to foreign particles,
remove expansion valve
and remove particles with
dry and compressed air
(not shop air).
If either of the above
methods cannot correct
the problem, replace
expansion valve.
Replace liquid tank.
Check lubricant for con-
tamination.
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont’d)
HA-74