2009 NISSAN LATIO Service Repair Manual

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Page 3929 of 4331

NISSAN LATIO 2009 Service Repair Manual OK >> GO TO 22.
NG >> Repair harness or connector. Trouble Diagnosis Flow Chart " .
• BCM – ECM
• ECM – IPDM E/R
OK or NG OK >> Replace BCM. Refer to
BCS-18, " Removal and Installation of B

Page 3930 of 4331

NISSAN LATIO 2009 Service Repair Manual MTC
N
O P
Check continuity between A/C def
rost switch harness connector
M41 terminal 16 and ground.
OK or NG OK >> Replace defrost A/C switch.
NG >> Repair harness or connector.
Insufficient

Page 3931 of 4331

NISSAN LATIO 2009 Service Repair Manual YES >> Perform diagnostic work flow. Refer to "DIAGNOSTIC WORK FLOW".
NO >> GO TO 8. OK >> GO TO 9.
NG >> Perform diagnostic work flow. Refer to "DIAGNOSTIC WORK FLOW". OK >> If the symptom still exis

Page 3932 of 4331

NISSAN LATIO 2009 Service Repair Manual MTC
N
O P
*1
MTC-87, " Checking System for
Leaks Using the Fluorescent Leak
Detector " *2
MTC-78, " Removal and Installation of
Compressor - HR16DE " or
MTC-80, " Removal and Installation of Com

Page 3933 of 4331

NISSAN LATIO 2009 Service Repair Manual Removal and Installation " *2
MTC-33, " Front Blower Motor Circuit " *3
MTC-78, " Removal and Installation of
Compressor - HR16DE " or
MTC-80, " Removal and Installation of Com-
pressor - MR18DE "

Page 3934 of 4331

NISSAN LATIO 2009 Service Repair Manual MTC
N
O P
Testing must be performed as follows:
TEST READING Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
*1: With blower control dial in the "1

MTC
N
O P
Testing must be performed as follows:
TEST READING Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
*1: With blower control dial in the "1" position
*2: With blower control dial in the "4" position.
TROUBLE DIAGNOSIS FOR ABNORMAL PRESSURE Whenever system’s high and/or low side pressure(s) is /are abnormal, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table). Vehicle condition Indoors or in the shade (in a well-ventilated place)
Doors Closed
Door window Open
Hood Open
TEMP. Max. COLD
Mode control dial (Ventilation) set
Intake door lever (Recirculation) set
Blower speed Max. 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 - 60 20 (68) 7.2 - 9.1 (45 - 48)
25 (77) 11.4 - 13.8 (53 - 57)
30 (86) 15.5 - 18.4 (60 - 65)
35 (95) 20.3 - 23.7 (69 - 75)
60 - 70 20 (68) 9.1 - 10.9 (48 - 52)
25 (77) 13.8 - 16.2 (57 - 61)
30 (86) 18.4 - 21.3 (65 - 70)
35 (95) 23.7 - 27.1 (75 - 81) Ambient 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 20 (68)
843 - 1,036 *1
(11.08 - 13.63, 8.6 - 10.6, 122 - 150) 159.0 - 194.0
(1.59 - 1.94, 1.62 - 1.98, 23.1 - 28.1)
25 (77) 1,094 - 1,338 *1
(10.94 - 13.38, 11.2 - 13.6, 159 - 194) 196.3 - 240.0
(1.96 - 2.40, 2.00 - 2.45, 28.5 - 34.8)
30 (86) 1,298 - 1,590 *1
(12.98 - 15.90, 13.2 - 16.2, 188 - 231) 248.0 - 302.7
(2.48 - 3.03, 2.53 - 3.09, 36.0 - 43.9)
35 (95) 1,383 - 1,688 *2
(13.83 - 16.88, 14.1 - 17.2, 201 - 245) 308.8 - 377.4
(3.09 - 3.77, 3.15 - 3.85, 44.8 - 54.7)
40 (104) 1,628 - 1,988 *2
(16.28 - 19.88, 16.6 - 20.3, 236 - 288) 377.4 - 461.2
(3.77 - 4.61, 3.85 - 4.70, 54.7 - 66.8)

Page 3935 of 4331

Page 3936 of 4331

NISSAN LATIO 2009 Service Repair Manual MTC
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O P
Both High- and Low-pressure Sides are Too Low
Low-pressure Side Some times Becomes Negative
Low-pressure Side Becomes Negative Gauge indication Refrigerant cycle Probable cause Corrective ac

MTC
N
O P
Both High- and Low-pressure Sides are Too Low
Low-pressure Side Some times Becomes Negative
Low-pressure Side Becomes Negative Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too low. • There is a big temperature dif-
ference between liquid tank
outlet and inlet. Outlet tem-
perature is extremely low.
• Liquid tank inlet and expan- sion valve are frosted. Liquid tank inside is slightly
clogged. • Replace liquid tank.
• Check oil for contamination.
• Temperature of expansion valve inlet is extremely low as
compared with areas near liq-
uid tank.
• Expansion valve inlet may be
frosted.
• Temperature difference oc- curs somewhere in high-pres-
sure side. High-pressure pipe located be-
tween liquid tank and expansion
valve is clogged. • Check and repair malfunc-
tioning parts.
• Check oil for contamination.
Expansion valve and liquid tank
are warm or only cool when
touched. Low refrigerant charge.
↓
Leaking fittings or components Check refrigerant for leaks.
Refer to MTC-86, " Checking of
Refrigerant Leaks " .
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 specification.
↓
1. Improper expansion valve
adjustment.
2. Malfunctioning expansion valve.
3. Outlet and inlet may be clogged. • Remove foreign particles by
using compressed air.
• Replace expansion valve.
• Check oil for contamination.
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 oil for contamination.
Air flow volume is not enough or
is too low. Evaporator is frozen.• Check thermo control amp.
Refer to MTC-37, " Magnet
Clutch Circuit (If Equipped) "
.
• Replace compressor.
• Repair evaporator fins.
• Replace evaporator.
• Refer to MTC-33, " Front
Blower Motor Circuit " .

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