2006 NISSAN VERSA Workshop Service Repair Manual

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Page 2465 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual TROUBLE DIAGNOSIS
MTC-53
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MTC
Revision: June 20062007 Versa
*1MTC-85, "INSPECTION FOR
CLUTCH DISC TO PULLEY CLEAR-
ANCE"
*2MTC-37, "Blower Motor Circuit"*3EM-13, "Checking Drive

Page 2466 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual MTC-54
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
Recirculating-to-discharge Air Temperature Table
Ambient Air

Page 2467 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual TROUBLE DIAGNOSIS
MTC-55
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MTC
Revision: June 20062007 Versa
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose

TROUBLE DIAGNOSIS
MTC-55
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Revision: June 20062007 Versa
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unusual, 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).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
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
condenser.Excessive refrigerant charge in
refrigeration cycle.Reduce refrigerant until
specified pressure is
obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling perfor-
mance.
↓
1. Condenser fins are clogged.
2. Improper fan rotation of cooling
fan.
Clean condenser.
Check and repair cooling
fan if necessary.
Low-pressure pipe is not
cold.
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa
(1.96 bar, 2 kg/cm
2 , 28
psi). It then decreases
gradually thereafter.Poor heat exchange in condenser
(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 malfunction.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 discharge
flow.
Expansion valve is open a little
compared with the specification.
↓
Improper expansion valve adjust-
ment.Replace expansion valve.
AC359A
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.
Check and repair or
replace malfunctioning
parts.
Check oil for contami-
nation.
AC360A

Page 2468 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual MTC-56
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle

MTC-56
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
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 operation
is improper.
↓
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.Compressor pressure operation
is improper.
↓
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure
sides are too low.
There is a big temperature
difference 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
occurs somewhere in high-
pressure side.High-pressure pipe located
between liquid tank and expan-
sion 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 componentsCheck refrigerant for leaks.
Refer to MTC-92, "
Checking
for 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 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.
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-41, "
Magnet
Clutch Circuit (If Equipped)"
.
Replace compressor.
Repair evaporator fins.
Replace evaporator.
Refer to MTC-37, "Blower
Motor Circuit" .
AC353A

Page 2469 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual TROUBLE DIAGNOSIS
MTC-57
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Revision: June 20062007 Versa
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication Refrigerant cycle Pro

Page 2470 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual MTC-58
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Insufficient HeatingEJS0057Q
SYMPTOM: Insufficient heating
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECRE

Page 2471 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual TROUBLE DIAGNOSIS
MTC-59
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Revision: June 20062007 Versa
8. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check engine control temperature sensor. Refer to EC-200, "
DTC P0117, P01

Page 2472 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual MTC-60
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
NoiseEJS0057R
SYMPTOM: Noise
INSPECTION FLOW
*1.MTC-33, "Operational Check"*2.MTC-85, "INSPECTION FOR
CLUTCH DISC TO PULLEY CLEAR-
ANCE"
*3.MTC-

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