Nissan Pathfinder (2012 year). Manual — part 419
HAC-74
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
WATER VALVE CIRCUIT
WATER VALVE CIRCUIT
Water Valve Description (VK56DE)
INFOID:0000000007356380
COMPONENT DESCRIPTION
Water Valve
The water valve (1) cuts the flow of engine coolant to the front and
rear heater cores to allow for maximum cooling during A/C opera-
tion. It is controlled by the A/C auto amp.
Water Valve Diagnosis Procedure (VK56DE)
INFOID:0000000007356381
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
DIAGNOSTIC PROCEDURE FOR WATER VALVE
1.
CHECK WATER VALVE POWER AND GROUND CIRCUITS
1. Disconnect water valve connector F68.
2. Turn ignition switch ON.
3. Rotate temperature control dial (driver) to 32
°
C (90
°
F).
4. Check voltage between water valve harness connector F68 ter-
minal 1 and terminal 2 while rotating temperature control dial
(driver) to 18
°
C (60
°
F).
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M50.
3. Check continuity between water valve harness connector F68
(A) terminal 2 and A/C auto amp. harness connector M50 (B)
terminal 46.
4. Check continuity between water valve harness connector F68
(A) terminal 2 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
NO
>> Repair harness or connector.
WJIA1791E
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
Water valve: F68
2
1
Rotate temperature
control dial
Battery
voltage
WJIA1794E
2 - 46
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0203ZZ
August 2012
2012 Pathfinder
WATER VALVE CIRCUIT
HAC-75
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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B
HAC
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3.
CHECK WATER VALVE POWER AND GROUND CIRCUITS
1. Rotate temperature control dial (driver) to 18
°
C (60
°
F).
2. Check voltage between water valve harness connector F68 ter-
minal 1 and terminal 2 while rotating temperature control dial
(driver) to 32
°
C (90
°
F).
Is the inspection result normal?
YES
>> Replace the water valve.
NO
>> GO TO 4.
4.
CHECK WATER VALVE CONTROL OUTPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M50.
3. Check continuity between water valve harness connector F68
(A) terminal 1 and A/C auto amp. harness connector M50 (B)
terminal 45.
4. Check continuity between water valve harness connector F68
(A) terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
Water valve: F68
1
2
Rotate temperature
control dial
Battery
voltage
WJIA1792E
1 - 45
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA0204ZZ
August 2012
2012 Pathfinder
HAC-76
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
HEATER PUMP
HEATER PUMP
System Description (VQ40DE)
INFOID:0000000007356382
SYSTEM DESCRIPTION
Component Parts
Heater pump control system components are:
• A/C auto amp.
• 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 A/C auto amp.) 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.
Diagnosis Procedure (VQ40DE)
INFOID:0000000007356383
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
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).
WJIA1780E
August 2012
2012 Pathfinder
HEATER PUMP
HAC-77
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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B
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5. Check voltage between heater pump harness connector E141
terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> 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.
Is the inspection result normal?
YES
>> Replace heater pump. Refer to
NO
>> Repair harness or connector.
3.
CHECK HEATER PUMP RELAY
1. Turn ignition switch OFF.
2. Check heater pump relay. Refer to
HAC-78, "Component Inspection (VQ40DE)"
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> 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.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK HEATER PUMP MOTOR POWER CIRCUIT
1. Turn ignition switch OFF.
1 - Ground
: Battery voltage
WJIA1984E
2 - Ground
: Continuity should exist.
WJIA1985E
2 - Ground
: Battery voltage
5 - Ground
: Battery voltage
WJIA1986E
August 2012
2012 Pathfinder
HAC-78
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
HEATER PUMP
2. Check continuity between heater pump relay harness connector
(A) E144 terminal 3 and heater pump harness connector (B)
E141 terminal 1.
3. Check continuity between heater pump relay harness connector
(A) E144 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK CIRCUIT BETWEEN HEATER PUMP RELAY AND A/C AUTO AMP.
1. Disconnect A/C auto amp. connector.
2. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 50 and heater pump relay harness connector
E144 (B) terminal 1.
3. Check continuity between heater pump relay harness connector
E144 (B) terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
NO
>> Repair harness or connector.
Component Inspection (VQ40DE)
INFOID:0000000007356384
COMPONENT INSPECTION
Heater Pump Relay
Check continuity between terminals 3 and 5.
If NG, replace relay.
3 - 1
: Continuity should exist.
3 - Ground
: Continuity should not exist.
WJIA1987E
1 - 50
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA0263ZZ
Conditions
Continuity
12V direct current supply between terminals 1 and 2
Yes
No current supply
No
LHA160
August 2012
2012 Pathfinder
AMBIENT SENSOR
HAC-79
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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A
B
HAC
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AMBIENT SENSOR
Component Description
INFOID:0000000007356385
COMPONENT DESCRIPTION
Ambient Sensor
Ambient sensor (1) is attached to the radiator core support (left side). It detects ambient temperature and con-
verts it into a value which is then input into the A/C auto amp.
•
⇐
: Front
AMBIENT TEMPERATURE INPUT PROCESS
The A/C auto amp. includes a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient sensor increases quickly, the processing circuit retards the A/C auto amp. function. It
only allows the A/C auto amp. to recognize an ambient temperature increase of 0.33
°
C (0.6
°
F) per 100 sec-
onds.
This prevents constant adjustments due to momentary conditions, such as stopping after high speed driving.
Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor
will increase. This is because the heat from the engine compartment can radiate to the front grille area, loca-
tion of the ambient sensor.
Ambient Sensor Diagnosis Procedure
INFOID:0000000007356386
Regarding Wiring Diagram information, refer to
HAC-95, "Wiring Diagram - Automatic"
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. (40 or 41 is
indicated on A/C auto amp. as a result of conducting the A/C auto
amp. self-diagnosis)
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
AWIIA0262ZZ
AWIIA0160GB
August 2012
2012 Pathfinder
HAC-80
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector E1
terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor harness connector
E1 (B) terminal 2 and A/C auto amp. harness connector M49 (A)
terminal 26.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AMBIENT SENSOR
Check the Ambient Sensor Circuit. Refer to
HAC-80, "Ambient Sensor Component Inspection"
Is the inspection result normal?
YES
>> 1. Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
2. GO TO
HAC-24, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace ambient sensor.
2. GO TO
HAC-24, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
4.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor harness connector
E1 (B) terminal 1 and A/C auto amp. harness connector M49 (A)
terminal 25.
4. Check continuity between ambient sensor harness connector
E1 (B) terminal 1 and ground.
Is the inspection result normal?
YES
>> 1. Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
2. GO TO
HAC-24, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
Ambient Sensor Component Inspection
INFOID:0000000007356387
COMPONENT INSPECTION
Ambient Sensor
1 - Ground
: Approx. 5V
AWIIA0161ZZ
2 - 26
: Continuity should exist.
AWIIA1039ZZ
1 - 25
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA1040ZZ
August 2012
2012 Pathfinder
AMBIENT SENSOR
HAC-81
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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After disconnecting ambient sensor (1) connector E1, measure
resistance between terminals 1 and 2 at sensor component side,
using the table below.
•
⇐
: Front
NOTE:
The ambient sensor is located behind the front grille, below the hood
latch. The ambient sensor (1) provides input for the automatic A/C
system.
If NG, replace ambient sensor. Refer to
HA-57, "Removal and Installation"
.
Temperature
°
C (
°
F)
Resistance k
Ω
−
15 (5)
12.73
−
10 (14)
9.92
−
5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
WJIA1981E
August 2012
2012 Pathfinder
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