Nissan Pathfinder (2005 year). Instruction — part 56
TROUBLE DIAGNOSIS
ATC-95
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ATC
2005 Pathfinder
2.
CHECK CIRCUIT BETWEEN REAR AIR CONTROL AND FRONT AIR CONTROL FOR OPEN AND
SHORT
1.
Turn ignition switch OFF.
2.
Disconnect front air control and rear air control connectors.
3.
Check continuity between front air control harness connector
M49 terminal 24 and rear air control harness connector M209
terminal 5.
4.
Check continuity between rear air control harness connector
M209 terminal 5 and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK CIRCUIT BETWEEN REAR AIR CONTROL AND AIR MIX DOOR MOTOR (REAR) FOR OPEN
OR SHORT
1.
Disconnect air mix door motor (rear) connector.
2.
Check continuity between rear air control harness connector
M209 terminal 2 and 4 and air mix door motor (rear) harness
connector B155 terminal 2 and 3.
3.
Check continuity between rear air control harness connector
M209 terminals 2 and 4 and ground.
OK or NG
OK
>> Replace rear air control. Refer to
.
NG
>> Repair harness or connector.
24 - 5
Continuity should exist.
5 - Ground
Continuity should not exist.
WJIA1133E
2 - 2
Continuity should exist.
4 - 3
Continuity should exist.
2, 4 - Ground
Continuity should not exist.
WJIA1271E
ATC-96
TROUBLE DIAGNOSIS
2005 Pathfinder
Magnet Clutch Circuit
EJS002XA
SYMPTOM: Magnet clutch does not engage.
INSPECTION FLOW
*1
.
.
*2
ATC-50, "A/C System Self-diagnosis
Function"
.
*3
ATC-51, "SELF-DIAGNOSIS CODE
CHART"
.
*4
ATC-113, "Ambient Sensor 1 Cir-
cuit"
.
*5
ATC-122, "Intake Sensor Circuit"
WJIA1285E
TROUBLE DIAGNOSIS
ATC-97
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ATC
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 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.
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
ATC-50, "A/C System Self-diagnosis Function"
.
OK or NG
OK
>> GO TO 2.
NG
>> Malfunctioning intake sensor. Refer to
ATC-122, "Intake Sensor Circuit"
.
Ambient temperature
°
C (
°
F)
Compressor ON
intake temperature
°
C (
°
F)
Compressor OFF
intake temperature
°
C (
°
F)
0 (32)
2.5 (37)
2.0 (36)
10 (50)
2.5 (37)
2.0 (36)
20 (68)
2.5 (37)
1.5 (35)
30 (86)
2.0 (36)
0.5 (33)
40 (104)
2.0 (36)
0.5 (33)
50 (122)
2.0 (36)
0.5 (33)
WJIA1272E
ATC-98
TROUBLE DIAGNOSIS
2005 Pathfinder
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.
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 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 compressor ON/OFF signal. Refer to
.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 6.
11 – 1
: Continuity should exist.
WJIA0560E
SJIA0197E
A/C SW ON
: COMP ON SIG ON
A/C SW OFF
: COMP ON SIG OFF
WJIA0469E
TROUBLE DIAGNOSIS
ATC-99
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B
ATC
2005 Pathfinder
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.
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
.
27 - 10
Continuity should exist.
WJIA1136E
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
ATC-100
TROUBLE DIAGNOSIS
2005 Pathfinder
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"
.
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 M50 terminal 35.
OK or NG
OK
>> GO TO 11.
NG
>> Repair harness or connector.
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
ECM con-
nector
Terminal No.
F54
70
Ground
A/C switch: ON
0.36 - 3.88V
LJIA0124E
FRONT BLOWER CONTROL
DIAL ON
: FAN ON SIG ON
FRONT BLOWER CONTROL
DIAL OFF
: FAN ON SIG OFF
WJIA0469E
28 - 35
Continuity should exist.
WJIA1138E
TROUBLE DIAGNOSIS
ATC-101
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ATC
2005 Pathfinder
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 M50
terminal 35 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
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
ATC-32, "CAN Communication System Description"
.
●
BCM – ECM
●
ECM – IPDM E/R
●
ECM – Front air control
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.
Terminals
Condition
Voltage
(Approx.)
(+)
(-)
Front air con-
trol connector
Terminal No.
M50
35
Ground
A/C switch: ON
Blower motor
operates
0V
A/C switch: OFF
5V
WJIA1139E
WJIA1140E
ATC-102
TROUBLE DIAGNOSIS
2005 Pathfinder
Insufficient Cooling
EJS002XB
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
.
.
*2
ATC-50, "A/C System Self-diagno-
sis Function"
*3
ATC-51, "SELF-DIAGNOSIS CODE
CHART"
.
*4
.
*5
ATC-5, "Contaminated Refrigerant"
*6
.
*7
*8
WJIA1464E
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