Nissan Pathfinder (2007 year). Instruction — part 57
TROUBLE DIAGNOSIS
ATC-107
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ATC
2007 Pathfinder
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading
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 window
Open
Hood
Open
TEMP.
Max. COLD
Mode switch
(Ventilation) set
Recirculation (REC) switch
(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)
5.3 - 6.5 (42 - 44)
25 (77)
9.7 - 11.5 (49 - 53)
30 (86)
13.8 - 16.3 (57 - 61)
35 (95)
18.0 - 21.2 (64 - 70)
40 (104)
22.2 - 25.7 (72 - 78)
60 - 70
20 (68)
6.5 - 7.7 (44 - 46)
25 (77)
11.5 - 13.3 (53 - 56)
30 (86)
16.3 - 18.8 (61 - 66)
35 (95)
21.2 - 24.0 (70 - 75)
40 (104)
25.7 - 29.2 (78 - 85)
Ambient air
High-pressure (Discharge side)
kPa (kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (kg/cm
2
, psi)
Relative humidity
%
Air temperature
°
C (
°
F)
50 - 70
20 (68)
680 - 840
(6.94 - 8.57, 98.6 - 121.8)
160 - 198
(1.63 - 2.02, 23.2 - 28.7)
25 (77)
800 - 985
(8.16 - 10.05, 116.0 - 142.8)
198 - 245
(2.02 - 2.50, 28.7 - 35.5)
30 (86)
940 - 1,150
(9.59 - 11.73, 136.3 - 166.8)
225 - 278
(2.30 - 2.84, 32.6 - 40.3)
35 (95)
1,160 - 1,410
(11.83 - 14.38, 168.2 - 204.5)
273 - 335
(2.78 - 3.42, 39.6 - 48.6)
40 (104)
1,325 - 1,620
(13.52 - 16.52, 192.1 - 234.9)
325 - 398
(3.32 - 4.06, 47.1 - 57.7)
ATC-108
TROUBLE DIAGNOSIS
2007 Pathfinder
TROUBLE DIAGNOSES FOR UNUSUAL PRESSURE
Whenever system
′
s high and/or low side pressure is unusual, diagnose using a manifold gauge. The marker
above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan-
dard (usual) 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
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 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
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 (2
kg/cm
2
, 28 psi). It then
decreases gradually there-
after.
Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure
decreases too slowly.)
↓
Air in refrigeration cycle
Evacuate and recharge sys-
tem.
Engine tends to overheat.
Engine cooling systems mal-
function.
Check and repair engine cool-
ing 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 dis-
charge flow
●
Expansion valve is open a
little compared with the
specification.
↓
Improper expansion valve
adjustment
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 contamination.
AC360A
TROUBLE DIAGNOSIS
ATC-109
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ATC
2007 Pathfinder
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 opera-
tion is improper.
↓
Damaged inside compressor
packings.
Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.
Compressor pressure opera-
tion 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
temperature 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 liquid tank.
●
Expansion valve inlet may
be frosted.
●
Temperature difference
occurs somewhere in high-
pressure side.
High-pressure pipe located
between 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 compo-
nents.
Check refrigerant system for
leaks. Refer to
"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.
●
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 too low.
Evaporator is frozen.
●
Check intake sensor circuit.
Refer to
●
Replace compressor.
●
Repair evaporator fins.
●
Replace evaporator.
●
Refer to
AC353A
ATC-110
TROUBLE DIAGNOSIS
2007 Pathfinder
Low-pressure Side Sometimes Becomes Negative
Low-pressure Side Becomes Negative
Gauge indication
Refrigerant cycle
Probable cause
Corrective action
Low-pressure side sometimes
becomes negative.
●
Air conditioning system
does not function and does
not cyclically cool the com-
partment air.
●
The 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.
●
Drain water from refrigerant
or replace refrigerant.
●
Replace liquid tank.
AC354A
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 malfunction 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 refrig-
erant.
●
If due to foreign particles,
remove expansion valve
and remove the particles
with dry and compressed air
(not shop air).
●
If either of the above meth-
ods cannot correct the mal-
function, replace expansion
valve.
●
Replace liquid tank.
●
Check oil for contamination.
AC362A
TROUBLE DIAGNOSIS
ATC-111
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ATC
2007 Pathfinder
Insufficient Heating
EJS004PD
SYMPTOM: Insufficient heating
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1.
Press the AUTO switch.
2.
Turn the temperature control dial (driver) clockwise until 32
°
C (90
°
F) is displayed.
3.
Check for hot air at discharge air outlets.
Can this symptom be duplicated?
YES
>> GO TO 2.
NO
>> Perform complete system operational check. Refer to
ATC-52, "Operational Check (Front)"
2.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis. Refer to
ATC-50, "A/C System Self-diagnosis Function"
OK or NG
OK
>> GO TO 4.
NG
>> Refer to
ATC-51, "SELF-DIAGNOSIS CODE CHART"
4.
CHECK ENGINE COOLING SYSTEM
1.
Check for proper engine coolant level.
2.
Check hoses for leaks or kinks.
3.
Check radiator cap.
4.
Check for air in cooling system.
>> GO TO 5.
5.
CHECK HEATER PUMP
1.
Rotate temperature control dial to full hot 32
°
C (90
°
F).
2.
Rotate fan control dial counterclockwise to maximum speed.
3.
Heater pump should be activated.
OK or NG
OK
>> GO TO 6.
NG
>> Check heater pump circuit. Refer to
ATC-113, "Heater Pump Circuit"
6.
CHECK AIR MIX DOOR OPERATION
Check the operation of the air mix door.
OK or NG
OK
>> GO TO 7.
NG
>> Check the air mix door motor circuit. Refer to
ATC-112
TROUBLE DIAGNOSIS
2007 Pathfinder
7.
CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
OK or NG
OK
>> GO TO 8.
NG
>> Repair all disconnected or leaking air ducts.
8.
CHECK HEATER HOSE TEMPERATURES
1.
Start engine and warm it up to normal operating temperature.
2.
Touch both the inlet and outlet heater hoses.
OK or NG
OK
>> Hot inlet hose and a warm outlet hose: GO TO 9.
NG
>> Both hoses warm: GO TO 10.
9.
CHECK ENGINE COOLANT SYSTEM
Check engine control temperature sensor. Refer to
EC-208, "DTC P0117, P0118 ECT SENSOR"
.
OK or NG
OK
>> System OK.
NG
>> Repair or replace as necessary. Retest.
10.
CHECK HEATER HOSES
Check heater hoses for proper installation.
OK or NG
OK
>> System OK.
NG
>> 1. Back flush heater core.
2. Drain the water from the system.
3. Refill system with new engine coolant. Refer to
CO-10, "Changing Engine Coolant"
4. GO TO 11 to retest.
11.
CHECK HEATER HOSE TEMPERATURES
1.
Start engine and warm it up to normal operating temperature.
2.
Touch both the inlet and outlet heater hoses.
OK or NG
OK
>> System OK.
NG
>> Replace heater core. Refer to
.
TROUBLE DIAGNOSIS
ATC-113
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ATC
2007 Pathfinder
Heater Pump Circuit
EJS0052Q
SYSTEM DESCRIPTION
Component Parts
Heater pump control system components are:
●
Front air control
●
Heater pump relay
●
Heater pump
●
Intake sensor
System Operation
The heater pump improves heater performance specifically at idle conditions. It is designed to operate in
either of the following 2 situations:
1.
Front blower motor set to maximum speed and temperature control dial (driver or passenger) set to full hot
32
°
C (90
°
F) or
2.
Engine coolant temperature (signal via CAN communication) minus heater core outlet temperature (intake
sensor input to front air control) is greater than 20
°
C (68
°
F). If the difference is less than 16
°
C (61
°
F),
the heater pump will not operate unless the conditions in item No. 1 above are met.
WJIA1780E
ATC-114
TROUBLE DIAGNOSIS
2007 Pathfinder
DIAGNOSTIC PROCEDURE FOR HEATER PUMP CIRCUIT
1.
CHECK POWER SUPPLY TO HEATER PUMP
1.
Disconnect heater pump connector.
2.
Turn ignition switch ON.
3.
Set front blower motor to maximum speed.
4.
Turn temperature control dial (passenger or driver) to full hot 32
°
C (90
°
F).
5.
Check voltage between heater pump harness connector E141
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 3.
2.
CHECK HEATER PUMP GROUND
1.
Turn ignition switch OFF.
2.
Check continuity between heater pump harness connector E141
terminal 2 and ground.
OK or NG
OK
>> Replace heater pump. Refer to
NG
>> Repair harness or connector.
3.
CHECK HEATER PUMP RELAY
1.
Turn ignition switch OFF.
2.
Check heater pump relay. Refer to
OK or NG
OK
>> GO TO 4.
NG
>> Replace heater pump relay.
4.
CHECK RELAY POWER SUPPLY
1.
Turn ignition switch ON.
2.
Check voltage between heater pump relay harness connector
E144 terminals 2, 5 and ground.
OK or NG
OK
>> GO TO 5.
NG
>> Repair harness or connector.
1 - Ground
: Battery voltage
WJIA1984E
2 - Ground
: Continuity should exist.
WJIA1985E
2 - Ground
: Battery voltage
5 - Ground
: Battery voltage
WJIA1986E
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