Nissan Pathfinder (2006 year). Instruction — part 54
TROUBLE DIAGNOSIS
ATC-97
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ATC
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 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-51, "A/C System Self-diagnosis Function"
OK or NG
OK
>> GO TO 2.
NG
>> Malfunctioning intake sensor. Refer to
ATC-125, "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
2006 Pathfinder
2.
PERFORM AUTO ACTIVE TEST
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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ATC
2006 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
2006 Pathfinder
8.
CHECK REFRIGERANT PRESSURE SENSOR
WITH CONSULT-II
1.
Start engine.
2.
Check voltage of refrigerant pressure sensor. Refer to
ATC-34, "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-659, "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
2006 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
●
BCM – ECM
●
ECM – IPDM E/R
●
ECM – Front air control
OK or NG
OK
>> Inspection End.
NG
>> Repair or replace malfunctioning part(s).
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
ATC-102
TROUBLE DIAGNOSIS
2006 Pathfinder
Insufficient Cooling
EJS004PC
SYMPTOM: Insufficient cooling
INSPECTION FLOW
*1
.
*2
ATC-51, "A/C System Self-diagno-
sis Function"
*3
ATC-52, "SELF-DIAGNOSIS CODE
CHART"
*4
*5
ATC-5, "Contaminated Refrigerant"
*6
.
*7
*8
WJIA1464E
TROUBLE DIAGNOSIS
ATC-103
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ATC
2006 Pathfinder
PERFORMANCE TEST DIAGNOSES
*1
*2
*3
ATC-106, "Trouble Diagnoses for
Unusual Pressure"
*4
ATC-63, "Air Mix Door Motor Circuit"
RJIA1601E
ATC-104
TROUBLE DIAGNOSIS
2006 Pathfinder
*1
ATC-159, "Removal and Installation
for Compressor Clutch"
*2
ATC-75, "Front Blower Motor Circuit"
*3
WJIA1371E
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