Nissan Pathfinder (2006 year). Manual — part 339
TROUBLE DIAGNOSIS
MTC-65
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
Magnet Clutch Circuit
EJS004RR
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
.
*2
ATC-125, "Intake Sensor Circuit"
*3
WJIA1677E
MTC-66
TROUBLE DIAGNOSIS
2006 Pathfinder
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The front air control 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 3.5
°
C (38.3
°
F), the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than 2.5
°
C (36.5
°
F).
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
PERFORM AUTO ACTIVE TEST
Does magnet clutch operate?
YES or NO
YES
>>
●
WITH CONSULT-II
GO TO 2.
●
WITHOUT CONSULT-II
GO TO 8.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 12.
2.
CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL
Check A/C compressor ON/OFF signal. Refer to
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 8.
WJIA1490E
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
WJIA0469E
TROUBLE DIAGNOSIS
MTC-67
C
D
E
F
G
H
I
K
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M
A
B
MTC
2006 Pathfinder
3.
CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to
EC-659, "REFRIGERANT PRESSURE SENSOR"
.
OK or NG
OK
>> GO TO 4.
NG
>> Replace refrigerant pressure sensor. Refer to
EC-663, "Removal and Installation"
4.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 5.
5.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1.
Turn ignition switch OFF.
2.
Disconnect BCM connector and front air control connector.
3.
Check continuity between BCM harness connector M18 (A) ter-
minal 28 and front air control harness connector M49 (B) termi-
nal 18.
OK or NG
OK
>> GO TO 6.
NG
>> Repair harness or connector.
BLOWER CONTROL DIAL
ON
: FAN ON SIG ON
BLOWER CONTROL DIAL
OFF
: FAN ON SIG OFF
WJIA0469E
A
B
Connector
Terminal Connector
Terminal
Continuity
BCM: M18
28
Front air control:
M49
18
Yes
WJIA1627E
MTC-68
TROUBLE DIAGNOSIS
2006 Pathfinder
6.
CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)
1.
Reconnect BCM connector and front air control connector.
2.
Turn ignition switch ON.
3.
Turn A/C switch ON.
4.
Check voltage between front air control harness connector M49
terminal 18 and ground.
OK or NG
OK
>> Replace BCM. Refer to
BCS-27, "Removal and Installation"
NG-1
>> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to
NG-2
>> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to
7.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
OK or NG
OK
>> Inspection End.
NG
>> Repair or replace malfunctioning part(s).
8.
CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL)
1.
Reconnect BCM connector and front air control connector.
2.
Turn ignition switch ON.
3.
Check voltage between front air control harness connector M49
terminal 10 and ground.
OK or NG
OK
>> GO TO 9.
NG-1
>> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to
NG-2
>> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
Front air con-
trol connector
Terminal No.
M49
18
Ground
A/C switch: ON
Blower motor
operates
0V
A/C switch: OFF
5V
WJIA1628E
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
Front air
control con-
nector
Terminal No.
M49
10
Ground
A/C switch: ON
0V
A/C switch:
OFF
Battery voltage
WJIA1137E
TROUBLE DIAGNOSIS
MTC-69
C
D
E
F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
9.
CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL
1.
Disconnect BCM connector and front air control connector.
2.
Check continuity between BCM harness connector M18 terminal
27 and front air control harness connector M49 terminal 10.
OK or NG
OK
>> GO TO 10.
NG
>> Repair harness or connector.
10.
CHECK INTAKE SENSOR CIRCUITS
Check intake sensor. Refer to
MTC-80, "Intake Sensor Circuit"
OK or NG
OK
>> GO TO 11.
NG
>> Replace intake sensor. Refer to
.
11.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
OK or NG
OK
>> Replace BCM. Refer to
BCS-27, "Removal and Installation"
NG
>> Repair or replace malfunctioning part(s).
12.
CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage to terminal.
OK or NG
OK
>> GO TO 13.
NG
>> Replace magnet clutch. Refer to
and Installation for Compressor Clutch"
13.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R connector and A/C 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.
OK or NG
OK
>> Replace IPDM E/R. Refer to
NG
>> Repair harness or connector.
27 - 10
: Continuity should exist.
WJIA1136E
WJIA1472E
11 – 1
: Continuity should exist.
WJIA1470E
MTC-70
TROUBLE DIAGNOSIS
2006 Pathfinder
Insufficient Cooling
EJS004RS
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
ATC-53, "Operational Check
(Front)"
*2
*3
ATC-5, "Contaminated Refrigerant"
*4
ATC-103, "PERFORMANCE TEST
DIAGNOSES"
*5
*6
WJIA1340E
TROUBLE DIAGNOSIS
MTC-71
C
D
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F
G
H
I
K
L
M
A
B
MTC
2006 Pathfinder
PERFORMANCE TEST DIAGNOSES
*1
*2
*3
ATC-106, "Trouble Diagnoses for
Unusual Pressure"
*4
ATC-63, "Air Mix Door Motor Circuit"
RJIA1601E
MTC-72
TROUBLE DIAGNOSIS
2006 Pathfinder
*1
ATC-159, "Removal and Installation
for Compressor Clutch"
*2
ATC-75, "Front Blower Motor Circuit"
*3
RJIA3107E
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