Nissan Pathfinder (2008 year). Manual — part 440
HAC-64
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between A/C auto amp. harness connector
M50 (A) terminal 37 and rear air control (front) harness connec-
tor R2 (B) terminal 7.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
8.
CHECK REAR AIR CONTROL (FRONT) REFERENCE GROUND CIRCUIT FOR OPEN
1.
Disconnect A/C auto amp. connector.
2.
Check continuity between A/C auto amp. harness connector
M49 (A) terminal 3 and rear air control (front) harness connector
R2 (B) terminal 8.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
Rear Air Control (Rear) Diagnosis Procedure
INFOID:0000000001366726
DIAGNOSTIC PROCEDURE FOR REAR AIR CONTROL (REAR)
1.
CHECK REAR AIR CONTROL (REAR) AUX TEMPERATURE POT VOLTAGE
1.
Turn ignition switch OFF.
2.
Disconnect rear air control (rear).
3.
Turn ignition switch ON.
4.
Check voltage between rear air control (rear) harness connector
M208 terminal 7 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 5.
2.
CHECK REAR AIR CONTROL (REAR) REFERENCE VOLTAGE
Check voltage between rear air control (rear) harness connector
M208 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 6
3.
CHECK REAR AIR CONTROL (REAR) REFERENCE RETURN GROUND
Continuity should exist.
AWIIA0235ZZ
Continuity should exist.
AWIIA0261ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (rear): M208
7
Ground
4.5V
AWIIA0258ZZ
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
Rear air control (rear): M208
3
Ground
4.5V
AWIIA0257ZZ
REAR AIR CONTROL SYSTEM
HAC-65
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
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A
B
HAC
N
O
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1.
Turn ignition switch OFF.
2.
Check continuity between rear air control (rear) harness connec-
tor M208 terminal 8 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 7.
4.
CHECK REAR AIR CONTROL (REAR) GROUND CIRCUIT
1.
Check continuity between rear air control (rear) harness connec-
tor M208 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace rear air control (rear). Refer to
.
NO
>> Repair harness or connector.
5.
CHECK REAR AUX TEMP CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C AUTO AMP. FOR
OPEN
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between rear air control (rear) harness connec-
tor M50 (A) terminal 51 and rear air control (rear) harness con-
nector M208 (B) terminal 7.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
6.
CHECK REFERENCE VOLATAGE CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C AUTO
AMP. FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between rear air control (rear) harness connec-
tor M50 (A) terminal 28 and rear air control (rear) harness con-
nector M208 (B) terminal 3.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
7.
CHECK REFERENCE RETURN GROUND CIRCUIT BETWEEN REAR AIR CONTROL (REAR) AND A/C
AUTO AMP. FOR OPEN
Continuity should exist.
AWIIA0259ZZ
Continuity should exist.
AWIIA0254ZZ
Continuity should exist.
AWIIA0235ZZ
Continuity should exist.
AWIIA0260ZZ
HAC-66
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
REAR AIR CONTROL SYSTEM
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between rear air control (rear) harness connec-
tor M49 (A) terminal 3 and rear air control (rear) harness con-
nector M208 (B) terminal 8.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair harness or connector.
Continuity should exist.
AWIIA0261ZZ
MAGNET CLUTCH
HAC-67
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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MAGNET CLUTCH
System Description
INFOID:0000000001366727
SYSTEM DESCRIPTION
The A/C auto amp. controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The A/C auto amp. will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor and the ambient sensor.
When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.
Magnet Clutch Component Function Check
INFOID:0000000001366728
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH
1.
Turn ignition switch ON.
2.
Press the A/C switch.
3.
Press vent switch (
).
4.
Display shows
, A/C. Confirm that the compressor clutch engages (sound or visual inspection). (Dis-
charge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Can the symptom be duplicated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
.
Does another symptom exist?
YES
>> Refer to
HAC-122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
NO
>> System OK.
3.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis to check for any codes. Refer to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
Are any self-diagnosis codes present?
YES
>> Refer to
HAC-24, "A/C System Self-Diagnosis Code Chart"
.
Ambient temperature
°
C
(
°
F)
VK56DE Model
VQ40DE Model
Compressor ON
intake temperature
°
C
(
°
F)
Compressor OFF
intake temperature
°
C
(
°
F)
Compressor ON
intake temperature
°
C
(
°
F)
Compressor OFF
intake temperature
°
C
(
°
F)
0 (32)
6.0 (43)
5.5 (42)
5.5 (42)
5.0 (41)
10 (50)
5.0 (41)
5.0 (41)
4.5 (40)
4.5 (40)
20 (68)
3.5 (38)
3.0 (37)
3.0 (37)
2.5 (37)
30 (86)
3.0 (37)
2.5 (37)
2.5 (37)
1.5 (35)
40 (104)
3.0 (37)
2.5 (37)
2.0 (36)
1.0 (34)
50 (122)
3.0 (37)
2.5 (37)
2.0 (36)
1.0 (34)
HAC-68
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
NO
>> GO TO 5.
5.
CHECK AMBIENT SENSOR
Check and verify ambient sensor circuit. Refer to
HAC-77, "Ambient Sensor Diagnosis Procedure"
>> GO TO 6.
6.
CHECK INTAKE SENSOR
Check and verify intake sensor circuit. Refer to
HAC-157, "Intake Sensor Diagnosis Procedure"
.
>> GO TO 7.
7.
RECHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to
.
Does another symptom exist?
YES
>> Refer to
HAC-122, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"
NO
>> Replace A/C auto amp. Refer to
VTL-8, "Removal and Installation"
Magnet Clutch Diagnosis Procedure
INFOID:0000000001366729
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
CHECK INTAKE AND AMBIENT SENSOR CIRCUITS
Check intake and ambient sensors. Refer to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> • Malfunctioning intake sensor. Refer to
HAC-157, "Intake Sensor Diagnosis Procedure"
.
• Malfunctioning ambient sensor. Refer to
HAC-77, "Ambient Sensor Diagnosis Procedure"
2.
PERFORM AUTO ACTIVE TEST
PCS-10, "Diagnosis Description"
.
Does magnet clutch operate?
AWIIA0198GB
MAGNET CLUTCH
HAC-69
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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YES
>> •
WITH CONSULT-III
GO TO 5.
•
WITHOUT CONSULT-III
GO TO 6.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
3.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R connector and compressor (magnet
clutch) connector.
3.
Check continuity between IPDM E/R harness connector E119
terminal 11 and A/C compressor harness connector F3 terminal
1.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH CIRCUIT
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-21, "CONSULT-III Function (HVAC)"
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 (A) ter-
minal 27 and A/C auto amp. harness connector M49 (B) terminal
4.
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)
11 – 1
: Continuity should exist.
WJIA0560E
SJIA0197E
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
27 - 4
Continuity should exist.
AWIIA0199ZZ
HAC-70
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
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
.
8.
CHECK REFRIGERANT PRESSURE SENSOR
1.
Start engine.
2.
Check voltage between ECM harness connector F54 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-21, "CONSULT-III Function (HVAC)"
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 10.
10.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.
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
Terminals
Condition
Voltage
(+)
(-)
ECM con-
nector
Terminal No.
F54
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
MAGNET CLUTCH
HAC-71
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1.
Turn ignition switch OFF.
2.
Disconnect BCM connector and A/C auto amp. connector.
3.
Check continuity between BCM harness connector M18 (A) ter-
minal 28 and A/C auto amp. harness connector M49 terminal 5.
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.
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
>> Inspection End.
NO
>> Repair or replace malfunctioning part(s).
28 - 5
Continuity should exist.
AWIIA0201ZZ
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
AWIIA0202ZZ
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