NISSAN PATROL 2006 Service Manual

jA
Note
CHECK GROUND CIRCUIT FOR FAN
SWITCH.
Check circuit continuity between fan switch
harness terminal No.j
5and body ground.
OK
CHECK RESISTOR AFTER DISCONNECT-
ING IT.
(Refer to Electrical Components Inspection.)
(HA-31)
OK NG
bjB
bjC
bjD
Replace resistor.jE
Reconnect resistor harness connector.
...
CHECK FAN SWITCH CIRCUIT.
Do approx. 12 volts exist between each fan switch har-
ness terminal and body ground?
Ye s N o
.
Note
Check circuit continuity
between fan switch harness
terminal and resistor har-
ness terminal.
If OK, check harness for
short.
CHECK FAN SWITCH AFTER DIS-
CONNECTING IT.
(Refer to Electrical Components
Inspection.) (HA-31)cNG
Replace fan switch.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
Flow chart
No.Terminal No.
Voltage
Å@
j1
Body ground Approx. 12Vj2
j3
j4
Terminal No.
Conti-
nuity Fan
switchResistor
j
4j4
Ye s j3j3
j2j2
j1j1
RHA600G
RHA601G
RHA602G
.
.
.
.
.
.
.
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont'd)
HA-30

ELECTRICAL COMPONENTS INSPECTION
Fan switch
Check continuity between terminals at each switch position.
KNOB POSITION Continuity between terminals
OFF
1j
1Ðj6Ðj5
2j2Ðj6Ðj5
3j3Ðj6Ðj5
4j4Ðj6Ðj5
Blower motor
Con®rm smooth rotation of the blower motor.
+Ensure that there are no foreign particles inside the intake unit.
Blower resistor
Check resistance between terminals.
Terminal No.
Resistance
(+) (þ)
j
2
j4
Approx. 1.4 - 1.6W
j
1Approx. 2.5 - 2.8W
j
3Approx. 0.5 - 0.6W
RHA594G
RHA595G
TROUBLE DIAGNOSESMANUAL
Blower Motor (Cont'd)
HA-31

Insufficient Cooling
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT COOLING
SYMPTOM:
+Insufficient cooling.
Inspection ¯ow
*1: HA-40
*2: HA-35
*3: HA-33*4: HA-22
*5: HA-21*6: HA-0
*7: HA-47
RHA603G
TROUBLE DIAGNOSESMANUAL
HA-32

PERFORMANCE TEST DIAGNOSES
*1: HA-35 *2: HA-35 *3: HA-36
MHA649A
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont'd)
HA-33

MHA650A
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont'd)
HA-34

PERFORMANCE CHART
Test condition
Testing 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 to 10 minutes before taking
measurements.
Rear cooler: ON (For rear cooler equipped model only)
Test reading (Single A/C equipped model)
Recirculating-to-discharge air temperature table
Inside air (Recirculating air) at blower assembly inlet
Discharge air temperature at center ventilator ÉC (ÉF)
Relative humidity % Air temperature ÉC (ÉF)
50-6025 (77) 8.0 - 10.0 (46 - 50)
30 (86) 12.0 - 15.0 (54 - 59)
35 (95) 16.0 - 20.0 (61 - 68)
40 (104) 20.5 - 24.5 (69 - 76)
60-7025 (77) 10.4 - 13.0 (51 - 55)
30 (86) 15.0 - 18.0 (59 - 64)
35 (95) 19.5 - 23.4 (67 - 74)
40 (104) 24.5 - 28.5 (76 - 83)
Ambient air temperature-to-operating pressure table
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
ÉC (ÉF)
50-7025 (77)1,373 - 1,471 (13.73 - 14.71,
14.0 - 15.0, 199 - 213)196 - 245 (1.96 - 2.45,
2.0 - 2.5, 28 - 36)
30 (86)1,275 - 1,520 (12.75 - 15.20,
13.0 - 15.5, 185 - 220)226 - 284 (2.26 - 2.84,
2.3 - 2.9, 33 - 41)
35 (95)1,412 - 1,716 (14.12 - 17.16,
14.4 - 17.5, 205 - 249)255 - 314 (2.55 - 3.14,
2.6 - 3.2, 37 - 46)
40 (104)1,608 - 1,932 (16.08 - 19.32,
16.4 - 19.7, 233 - 280)294 - 353 (2.94 - 3.53,
3.0 - 3.6, 43 - 51)
TROUBLE DIAGNOSESMANUAL
Insufficient Cooling (Cont'd)
HA-35

Trouble Diagnoses for Abnormal Pressure
Whenever system's high or low-pressure side is abnormal, diagnose using a manifold gauge. The marker
above the gauge scale in the following table indicates the standard (normal) pressure range. Since the stan-
dard (normal) pressure differs from vehicle to vehicle, refer to HA-35 (``Ambient air temperature-to-operating
pressure table'').
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 cycle.Reduce refrigerant until speci-
®ed pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance.
¯
j
1Condenser ®ns are clogged.
j
2Improper fan rotation of
cooling fan.+Clean 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 gradu-
ally thereafter.Poor heat exchange in con-
denser.
(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 mal-
function.Check and repair each engine
cooling system.
+An area of the low-pressure
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 ¯ow.
+Expansion valve is open a
little compared with the
speci®cation.
¯
j
1Improper thermal valve
installation.
j
2Improper expansion valve
adjustment.Replace expansion valve.
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 contami-
nation.
TROUBLE DIAGNOSESMANUAL
HA-36

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 com-
pressor operation stops.Compressor pressure operation
is improper.
¯
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high and low-pressure
sides.Compressor pressure operation
is improper.
¯
Damaged inside compressor
packings.Replace compressor.
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 expan-
sion valve are frosted.Liquid tank inside is clogged a
little.+Replace liquid tank.
+Check lubricant for contami-
nation.
+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 side.High-pressure pipe located
between liquid tank and expan-
sion valve is clogged.+Check and repair malfunc-
tioning parts.
+Check lubricant for contami-
nation.
+Expansion valve and liquid
tank are warm or only cool
when touched.Low refrigerant charge.
¯
Leaking ®ttings or components.Check refrigerant for leaks.
Refer to ``Checking Refrigerant
Leaks'', HA-119.
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 speci®ca-
tion.
¯
j
1Improper expansion valve
adjustment.
j
2Malfunctioning thermal
valve.
j
3Outlet and inlet may be
clogged.+Remove foreign particles by
using compressed air.
+Check 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.+Check and repair malfunc-
tioning parts.
+Check lubricant for contami-
nation.
Air ¯ow volume is not enough
or is too low.Compressor pressure operation
is improper.Replace compressor.
TROUBLE DIAGNOSESMANUAL
Trouble Diagnoses for Abnormal Pressure
(Cont'd)
HA-37

Gauge indication Refrigerant cycle Probable cause Corrective action
Low-pressure side sometimes
becomes negative.
AC354A
+Air conditioner system does
not function and does not
cyclically cool the compart-
ment air.
+The system constantly func-
tions for a certain period of
time after compressor is
stopped and restarted.Refrigerant does not discharge
cyclically.
¯
Moisture is frozen at expansion
valve outlet and inlet.
¯
Water is mixed with refrigerant.+Drain water from refrigerant
or replace refrigerant.
+Replace liquid tank.
Low-pressure side becomes
negative.
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 ¯ow.
¯
Expansion valve or liquid tank
is frosted.Leave the system at rest. Start
it again to check whether or not
the problem is caused by water
or foreign particles.
+If water is the cause, initially
cooling is okay. Then the
water freezes, causing a
blockage. Drain water from
refrigerant or replace refriger-
ant.
+If due to foreign particles,
remove expansion valve and
remove the particles with dry
and compressed air.
+If either of the above meth-
ods cannot correct the
problem, replace expansion
valve.
+Replace liquid tank.
+Check lubricant for contami-
nation.
TROUBLE DIAGNOSESMANUAL
Trouble Diagnoses for Abnormal Pressure
(Cont'd)
HA-38

Insufficient Heating
TROUBLE DIAGNOSIS PROCEDURE FOR INSUFFICIENT HEATING
SYMPTOM:
+Insufficient heating.
Inspection ¯ow
*1: HA-40
*2: HA-40*3: HA-22 *4: HA-21
RHA604G
TROUBLE DIAGNOSESMANUAL
HA-39