Nissan Pathfinder (2005 year). Instruction — part 359
TROUBLE DIAGNOSIS
MTC-63
C
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MTC
2005 Pathfinder
Magnet Clutch Circuit
EJS003VK
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
.
.
*2
ATC-122, "Intake Sensor Circuit"
.
WJIA1336E
MTC-64
TROUBLE DIAGNOSIS
2005 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 25
°
C (36.5
°
F).
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1.
CHECK INTAKE SENSOR CIRCUITS
Check intake sensor. Refer to
MTC-79, "Intake Sensor Circuit"
.
OK or NG
OK
>> GO TO 2.
NG
>> Replace intake sensor. Refer to
.
2.
PERFORM AUTO ACTIVE TEST
Refer to
.
Does magnet clutch operate?
YES or NO
YES
>>
●
WITH CONSULT-II
GO TO 5.
●
WITHOUT CONSULT-II
GO TO 6.
NO
>> Check 10A fuse (No. 42, located in IPDM E/R), and GO TO 3.
WJIA1337E
TROUBLE DIAGNOSIS
MTC-65
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MTC
2005 Pathfinder
3.
CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND 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
>> GO TO 4.
NG
>> Repair harness or connector.
4.
CHECK MAGNET CLUTCH CIRCUIT
Check for operation sound when applying battery voltage direct cur-
rent to terminal.
OK or NG
OK
>> Replace IPDM E/R. Refer to
.
NG
>> Replace magnet clutch. Refer to
and Installation for Compressor Clutch"
.
5.
CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check A/C compressor ON/OFF signal. Refer to
.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.
6.
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 terminal
27 and front air control harness connector M49 terminal 10.
OK or NG
OK
>> GO TO 7.
NG
>> Repair harness or connector.
11 – 1
: Continuity should exist.
WJIA1470E
WJIA1472E
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
WJIA0469E
27 - 10
Continuity should exist.
WJIA1136E
MTC-66
TROUBLE DIAGNOSIS
2005 Pathfinder
7.
CHECK VOLTAGE FOR FRONT AIR CONTROL (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 8.
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
.
8.
CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1.
Start engine.
2.
Check voltage of refrigerant pressure sensor. Refer to
ATC-33, "CONSULT-II Function (BCM)"
.
WITHOUT CONSULT-II
1.
Start engine.
2.
Check voltage between ECM harness connector F54 terminal
70 and ground.
OK or NG
OK
>>
●
WITH CONSULT-II
GO TO 9.
●
WITHOUT CONSULT-II
GO TO 10.
NG
>> Refer to
EC-691, "REFRIGERANT PRESSURE SENSOR"
.
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
Front air
control con-
nector
Terminal No.
M49
10
Ground
A/C switch: ON
0V
A/C switch: OFF
5V
WJIA1137E
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
ECM con-
nector
Terminal No.
F54
70
Ground
A/C switch: ON
0.36 - 3.88V
LJIA0124E
TROUBLE DIAGNOSIS
MTC-67
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D
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A
B
MTC
2005 Pathfinder
9.
CHECK BCM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 10.
10.
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 terminal
28 and front air control harness connector M49 terminal 18.
OK or NG
OK
>> GO TO 11.
NG
>> Repair harness or connector.
11.
CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN 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 18 and ground.
OK or NG
OK
>> GO TO 12.
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
.
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
WJIA0469E
28 - 18
Continuity should exist.
WJIA1338E
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
WJIA1339E
MTC-68
TROUBLE DIAGNOSIS
2005 Pathfinder
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
ATC-32, "CAN Communication System Description"
.
●
BCM – ECM
●
ECM – IPDM E/R
OK or NG
OK
>> Inspection End.
NG
>> Repair or replace malfunctioning part(s).
COMPONENT INSPECTION
Refrigerant Pressure Sensor
The refrigerant pressure sensor is attached to the condenser.
WJIA1140E
TROUBLE DIAGNOSIS
MTC-69
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M
A
B
MTC
2005 Pathfinder
Insufficient Cooling
EJS003VL
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
.
*2
. *3
ATC-5, "Contaminated Refrigerant"
.
*4
ATC-103, "PERFORMANCE TEST
DIAGNOSES"
.
*5
.
*6
WJIA1340E
MTC-70
TROUBLE DIAGNOSIS
2005 Pathfinder
PERFORMANCE TEST DIAGNOSES
*1
*2
*3
ATC-106, "Trouble Diagnoses for
Unusual Pressure"
*4
ATC-63, "Air Mix Door Motor Circuit"
RJIA1601E
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