Nissan X-Trail 32. Manual — part 1353
PERFORMANCE TEST
HA-71
< BASIC INSPECTION >
[MR20DD]
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PERFORMANCE TEST
Inspection
INFOID:0000000011000276
INSPECTION PROCEDURE
1.
Connect recovery/recycling/recharging equipment (for HFC-134a) or manifold gauge.
2.
Start the engine, and set to the following condition.
Test condition
3.
Maintain test condition until A/C system becomes stable. (Approximately 10 minutes)
4.
Check that test results of “recirculating-to-discharge air temperature” and “ambient air temperature-to-
operating pressure” are within the specified value.
5.
When test results are within the specified value, inspection is complete.
If any of test result is out of the specified value, perform diagnosis by gauge pressure. Refer to
.
RECIRCULATING-TO-DISCHARGE AIR TEMPERATURE TABLE
AMBIENT AIR TEMPERATURE-TO-OPERATING PRESSURE TABLE
Surrounding condition
Indoors or in the shade (in a well-ventilated place)
Vehicle condition
Door
Closed
Door glass
Full open
Hood
Open
Engine speed
Idle speed
A/C condition
Temperature control switch or dial
Full cold
A/C switch
ON
Air outlet
VENT (ventilation)
Intake door position
Recirculation
Fan (blower) speed
Maximum speed set
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature from center ventilator
°
C (
°
F)
Relative humidity
%
Air temperature
°
C (
°
F)
50 – 60
20 (68)
4.9 – 6.9 (41 – 44)
25 (77)
9.1 – 11.6 (48 – 53)
30 (86)
13.2 – 16.2 (56 – 61)
35 (95)
17.6 – 21.1 (64 – 70)
60 – 70
20 (68)
6.9 – 8.9 (44 – 48)
25 (77)
11.6 – 14.1 (53 – 57)
30 (86)
16.2 – 19.2 (61 – 66)
35 (95)
21.1 – 24.6 (70 – 76)
HA-72
< BASIC INSPECTION >
[MR20DD]
PERFORMANCE TEST
Fresh air
High-pressure (Discharge side)
kPa (bar, kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (bar, kg/cm
2
, psi)
Relative humidity
%
Air temperature
°
C (
°
F)
50 – 70
25 (77)
926 – 1,133
(9.3 – 11.3, 9.5 – 11.6, 134.3 –
164.2)
196 – 240
(2.0 – 2.4, 2.0 – 2.5, 28.4 – 34.8)
30 (86)
1,070 -– 1,308
(10.7 – 13.1, 10.9 – 13.3, 155.1 –
189.6)
233 – 285
(2.3 – 2.9, 2.4 – 2.9, 33.8 – 41.3)
35 (95)
1,091 – 1,332
(10.9 – 13.3, 11.1 – 13.6, 158.1 –
193.2)
278 – 340
(2.8 – 3.4, 2.8 – 3.5, 40.3 – 49.2)
40 (104)
1,292 – 1,579
(12.9 – 15.8, 13.2 – 16.1, 187.3 –
228.9)
333 – 407
(3.3 – 4.1, 3.4 – 4.2, 48.3 – 59.0)
REFRIGERATION SYSTEM SYMPTOMS
HA-73
< SYMPTOM DIAGNOSIS >
[MR20DD]
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SYMPTOM DIAGNOSIS
REFRIGERATION SYSTEM SYMPTOMS
Trouble Diagnosis For Unusual Pressure
INFOID:0000000011001057
Diagnose using a manifold gauge whenever system’s high and/or low side pressure(s) is/are unusual. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Refer to
above table (Ambient air temperature-to-operating pressure table) since the standard (usual) pressure, how-
ever, differs from vehicle to vehicle.
Symptom Table
INFOID:0000000011001058
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Both high- and low-pressure sides
are too high.
The pressure returns to nor-
mal soon after sprinkling wa-
ter on condenser.
Overfilled refrigerant.
Collect all refrigerant, evacuate
refrigerant cycle again, and
then refill it with the specified
amount of refrigerant.
Air flow to condenser is insuf-
ficient.
Insufficient condenser cooling
performance.
• Poor fan rotation of radiator
and condenser.
• Improper installation of air
guide.
• Clogged or dirty condenser
fins.
• Repair or replace malfunc-
tioning parts.
• Clean and repair condenser
fins.
When compressor is stopped,
a high-pressure reading
quickly drops by approximate-
ly 196 kPa (1.96 bar, 2 kg/
cm
2
, 28 psi). It then gradually
decreases.
Air mixed in refrigerant cycle.
Collect all refrigerant, evacuate
refrigerant cycle again, and
then refill it with the specified
amount of refrigerant.
• Low-pressure pipe is cooler
than the outlet of evapora-
tor.
• Low-pressure pipe is frost-
ed.
Expansion valve opened too
much (excessive flow of refrig-
erant).
Replace expansion valve.
High-pressure side is excessively
high and low-pressure side is too
low.
High-pressure pipe and upper
side of condenser become
hot, however, liquid tank does
not become so hot.
Clogged or crushed high-pres-
sure pipe located between
compressor and condenser.
Repair or replace the malfunc-
tioning parts.
High-pressure side is too low and
low-pressure side is too high.
• The readings of both sides
become equal soon after
compressor operation
stops.
• There is no temperature dif-
ference between high- and
low-pressure sides.
Malfunction in compressor sys-
tem (insufficient compressor
pressure operation).
• Damage or breakage of
valve.
• Malfunctioning gaskets.
Replace compressor.
AC359A
AC360A
AC356A
HA-74
< SYMPTOM DIAGNOSIS >
[MR20DD]
REFRIGERATION SYSTEM SYMPTOMS
Both high- and low-pressure sides
are too low.
• The area around evapora-
tor outlet does not become
cold.
• The area around evapora-
tor inlet becomes frosted.
Clogged expansion valve.
• Breakage of temperature
sensor.
• Clogging by foreign material.
Eliminate foreign material from
expansion valve, or replace it.
• There is a temperature dif-
ference between the areas
around outlet and inlet
pipes of liquid tank.
• Liquid tank becomes frost-
ed.
Malfunction in inner liquid tank
(clogged strainer).
Replace condenser and liquid
tank.
Evaporator becomes frosted.
Clogged or crushed low-pres-
sure pipe.
Repair or replace malfunction-
ing parts.
Malfunction in intake air tem-
perature sensor.
Check intake sensor system.
Refer to
(AUTOMATIC AIR
(MANU-
AL AIR CONDITIONING).
There is a small temperature
difference between the high
and low pressure pipes for re-
frigerant cycle.
• Shortage of refrigerant.
• Leakage of refrigerant.
• Check for leakage.
• Collect all refrigerant, evacu-
ate refrigerant cycle again,
and then refill it with the spec-
ified amount of refrigerant.
Low-pressure side sometimes be-
comes negative.
• Sometimes the area
around evaporator outlet
does not become cold.
• Sometimes the area
around evaporator inlet is
frosted.
• Icing caused by the mixing of
water in cooler cycle.
• Deteriorated dryer in liquid
tank.
• Collect all refrigerant.
• Evacuate refrigerant cycle
completely, and then refill it
with the specified amount of
refrigerant. At this time, al-
ways replace condenser and
liquid tank.
Hunting in high-pressure side.
There is no temperature dif-
ference between high- and
low-pressure sides.
Malfunctioning variable valve
in compressor.
• Replace compressor.
• Check ECV system. Refer to
HAC-113, "Diagnosis Proce-
dure"
(AUTOMATIC AIR
(MANUAL AIR CONDITION-
ING).
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
AC353A
AC354A
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