NISSAN X-TRAIL 2003 Electronic Repair Manual

TROUBLE DIAGNOSIS
ATC-83
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AT C
PERFORMANCE TEST DIAGNOSES
*1 Performance chartAT C - 8 4*3 Trouble diagnoses for abnormal pres-
sureAT C - 8 6*4 Air mix door motor circuitAT C - 6 1
*2 Performance chartAT C - 8 4

ATC-84
TROUBLE DIAGNOSIS
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
*1ATC-129, "Removal and Installation
for Compressor Clutch"
*2 Trouble diagnoses for blower motor
AT C - 6 7 , "
Blower Motor Circuit"
*3 Belt tension,EM-13QR engine ;EM-
11 0YD engine

TROUBLE DIAGNOSIS
ATC-85
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AT C
Test Reading (QR engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Test Reading (YD engine)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Vehicle location Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door windows Open
Hood Open
TEMP. Max. COLD
Mode switch (Ventilation) set
Intake switch (Recirculation) set
(blower) speedMax. speed set
Engine speed Idle speed
Operate the air conditioning system for 10 minutes before taking measurements.
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°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)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm2, psi)Low-pressure (Suction side)
kPa (kg/cm2, psi) Relative humidity
%Air temperature
°C(°F)
50 - 7030 (86)980 - 1,180
( 9.99 - 12.04 , 142 - 171)230 - 270 (2.35 - 2.75, 33 - 39)
35 (95)1,180 - 1,390
(12.04 - 14.18 , 171 - 202)260 - 310 (2.65 - 3.16, 38 - 45)
40 (104)1,400 - 1,580
( 14.28 - 16.12 , 203 - 229)300 - 350 (3.06 - 3.57, 44 - 51)
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator
°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)

ATC-86
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
Whenever system's high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the stan-
dard (normal) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature-
to-operating pressure table).
Both High and Low-pressure Sides are Too High.
Ambient air
High-pressure (Discharge side)
kPa (kg/cm2, psi)Low-pressure (Suction side)
kPa (kg/cm2, psi) Relative humidity
%Air temperature
°C(°F)
50 - 7020 (68) 765 - 922 (7.8 - 9.4, 111 - 134) 177 - 226 (1.8 - 2.3, 26 - 33)
25 (77) 922 - 1,020 ( 9.4 - 10.4, 134 - 148) 196 - 245 (2.0 - 2.5, 28 - 36)
30 (86) 1,177 - 1,451 (12.0 - 14.8, 171 - 210) 235 - 284 (2.4 - 2.9, 34 - 41)
35 (95) 1,373 - 1,667 (14 - 17, 199 - 242) 275 - 333 (2.8 - 3.4, 40 - 48)
40 (104) 1,618 - 1,961 (16.5 - 20.0, 235 - 284) 333 - 392 (3.4 - 4.0, 48 - 57)
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high and low-pressure
sides are too high.Pressure is reduced soon after
water is splashed on con-
denser.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 cool-
ing fan
lClean condenser.
lCheck and repair cooling fan
as necessary.
lLow-pressure pipe is not
cold.
lWhen compressor is stopped
high-pressure value quickly
drops by approximately 196
kPa (2 kg/cm2, 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.
lAn area of the low-pressure
pipe is colder than areas
near the evaporator outlet.
lPlates are sometimes cov-
ered with frost.
lExcessive liquid refrigerant
on low-pressure side
lExcessive refrigerant dis-
charge flow
lExpansion valve is open a lit-
tle compared with the specifi-
cation.
¯
1. Improper thermal valve
installation
2. Improper expansion valve
adjustmentReplace expansion valve.
AC359A

TROUBLE DIAGNOSIS
ATC-87
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AT C
High-pressure Side is Too High and Low-pressure Side is Too Low.
High-pressure Side is Too Low and Low-pressure Side is Too High.
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
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.
lCheck and repair or replace
malfunctioning parts.
lCheck lubricant for contami-
nation.
AC360A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.High and low-pressure sides
become equal soon after com-
pressor 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.
AC356A

ATC-88
TROUBLE DIAGNOSIS
Both High- and Low-pressure Sides are Too Low.
Low-pressure Side Sometimes Becomes Negative.
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.
lThere is a big temperature
difference between receiver
drier outlet and inlet. Outlet
temperature is extremely
low.
lLiquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged.
lReplace desiccant assem-
bly.
lCheck lubricant for contami-
nation.
lTemperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.
lExpansion valve inlet may
be frosted.
lTemperature difference
occurs somewhere in high-
pressure sideHigh-pressure pipe located
between receiver drier and
expansion valve is clogged.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge
¯
Leaking fittings or componentsCheck refrigerant for leaks.
Refer to Checking Refrigerant
Leaks,AT C - 1 4 0
.
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.
¯
1. Improper expansion valve
adjustment
2. Malfunctioning thermal
valve
3. Outlet and inlet may be
clogged.
lRemove foreign particles by
using compressed air.
lCheck lubricant for contami-
nation.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.
lCheck and repair malfunc-
tioning parts.
lCheck lubricant for contami-
nation.
Air flow volume is not enough
or is too low.Evaporator is frozen.
lCheck intake sensor circuit.
lReplace compressor.
AC353A
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
lAir conditioning system
does not function and does
not cyclically cool the com-
partment air.
lThe system constantly func-
tions for a certain period of
time after compressor 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.
lDrain water from refrigerant
or replace refrigerant.
lReplace desiccant assy.
AC354A

TROUBLE DIAGNOSIS
ATC-89
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AT C
Low-pressure Side Becomes Negative.
Insufficient HeatingEJS001H7
SYMPTOM: Insufficient heating
Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side becomes nega-
tive.
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.
lIf water is the cause, initially
cooling is okay. Then the
water freezes causing a
blockage. Drain water from
refrigerant or replace refrig-
erant.
lIf due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
lIf either of the above meth-
ods cannot correct the prob-
lem, replace expansion
valve.
lReplace desiccant assy.
lCheck lubricant for contami-
nation.
AC362A

ATC-90
TROUBLE DIAGNOSIS
INSPECTION FLOW
*1 Operational checkAT C - 5 1*6 Self-diagnosisAT C -4 2, see No.14. *10 Thermostat,CO-21QR engine;CO-
42YD engine
*2 Self-diagnosisAT C -4 2
, see No.1. *7 LAN system circuitAT C - 5 6*11CO-9, "Changing Engine Coolant"QR
engine;CO-30, "
ENGINE COOLANT"
YD engine
*3 Self-diagnosisAT C - 4 2
, see No.5. *8 Blower motor circuitAT C - 6 7*12CO-9, "ENGINE COOLANT"QR
engine;CO-30, "
ENGINE COOLANT"
YD engine
*4 Self-diagnosisAT C - 4 2
, see No.7. *9 Air mix door motor circuitAT C - 6 1*13CO-13, "CHECKING RADIATOR
CAP"QR engine;CO-34, "Checking
Radiator Cap"YD ENGINE
*5 Air mix door motor circuitAT C - 6 1
RJIA0550E

TROUBLE DIAGNOSIS
ATC-91
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AT C
NoiseEJS001H8
SYMPTOM: Noise
INSPECTION FLOW

ATC-92
TROUBLE DIAGNOSIS
Self-diagnosis
EJS001H9
Symptom: Self-diagnosis can not be performed.
INSPECTION FLOW
Memory FunctionEJS001HA
Symptom: Memory function does not operate.
*1ATC-129, "Removal and Installation
for Compressor Clutch"
*3AT C - 2 1 , "Maintenance of Lubricant
Quantity in Compressor"
*5EM-13, "Checking Drive Belts"QR
engine;EM-110, "
Checking Drive
Belts"YD engine
*2ATC-132, "
Inspection"*4 Operational checkAT C - 5 1
*1 Main power supply and body ground
circuit.PG-3*2 Ambient sensor circuit.AT C - 9 3*3 In-vehicle sensor circuit .AT C - 9 5
*4 sunload sensor circuit.AT C - 9 8*5 Intake sensor circuit.AT C - 1 0 1*6 Air mix door motor.AT C - 6 1
*7 Operational check.AT C - 5 1*8 Symptom table.AT C -3 0*9 Operational checkAT C - 5 1
RJIA0551E