Nissan Pathfinder (2011 year). Manual — part 451
MAGNET CLUTCH
HAC-71
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
.
NO
>> Replace magnet clutch. Refer to
Installation for Compressor Clutch"
5.
CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to
HAC-23, "AIR CONDITIONER : CONSULT-III Function (BCM -
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 6.
6.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and A/C auto amp. connector.
3. Check continuity between BCM harness connector M18 terminal 27 and A/C auto amp. harness connec-
tor M49 terminal 4.
4. Check continuity between BCM harness connector M18 terminal 27 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49
terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to
.
NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to
.
SJIA0197E
A/C SW ON
: AIR COND SW ON
A/C SW OFF
: AIR COND SW OFF
27 - 4
Continuity should exist.
27 - ground Continuity should not exist.
Terminals
Condition
Voltage
(+)
(-)
A/C auto
amp. con-
nector
Terminal No.
M49
4
Ground
A/C switch: ON
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0200ZZ
2011 Pathfinder
HAC-72
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
8.
CHECK REFRIGERANT PRESSURE SENSOR
1. Start engine.
2. Check voltage between ECM harness connector F54 (VQ40DE)
or F79 (VK56DE) terminal 70 and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Refer to
9.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
HAC-23, "AIR CONDITIONER : CONSULT-III Function (BCM - AIR CON-
.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and A/C auto amp. connector.
3. Check continuity between BCM harness connector M18 terminal 28 and A/C auto amp. harness connec-
tor M49 terminal 5.
4. Check continuity between BCM harness connector M18 terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR A/C AUTO AMP. (FAN ON SIGNAL)
1. Reconnect BCM connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M49
terminal 5 and ground.
Terminals
Condition
Voltage
(+)
(-)
ECM connector
Terminal
No.
F54 (VQ40DE)
F79 (VK56DE)
70
Ground
A/C switch: ON
Approx. 0.36 - 3.88V
LJIA0124E
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
28 - 5
Continuity should exist.
28 - ground Continuity should not exist.
AWIIA0202ZZ
2011 Pathfinder
MAGNET CLUTCH
HAC-73
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> GO TO 12.
NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace A/C auto amp. Refer to
.
NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
LAN-14, "Trouble Diagnosis Flow Chart"
.
• BCM – ECM
• ECM – IPDM E/R
• ECM – A/C auto amp.
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-29, "Removal and Installation of IPDM E/R"
.
NO
>> Repair or replace malfunctioning part(s).
Terminals
Condition
Voltage
(+)
(-)
A/C auto amp.
connector
Terminal No.
M49
5
Ground
A/C switch: ON
Blower motor
operates
Approx. 0V
A/C switch: OFF
Approx. 5V
2011 Pathfinder
HAC-74
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
WATER VALVE CIRCUIT
WATER VALVE CIRCUIT
Water Valve Description (VK56DE)
INFOID:0000000006243661
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:0000000006243662
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
2011 Pathfinder
WATER VALVE CIRCUIT
HAC-75
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
2011 Pathfinder
HAC-76
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
HEATER PUMP
HEATER PUMP
System Description (VQ40DE)
INFOID:0000000006243663
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:0000000006243664
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
2011 Pathfinder
HEATER PUMP
HAC-77
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
2011 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:0000000006243665
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
2011 Pathfinder
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