Nissan Pathfinder (2006 year). Manual - part 339

 

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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

.

ATC-53, "Operational Check 

(Front)"

*2

ATC-125, "Intake Sensor Circuit"

*3

MTC-82, "FRONT AIR CONTROL"

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

Refer to 

PG-24, "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 

MTC-29, "CON-

SULT-II Function (BCM)"

 .

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

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K

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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 

MTC-29, "CONSULT-II Func-

tion (BCM)"

 .

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 

MTC-82,

"CONTROL UNIT"

 .

NG-2

>> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

BCS-27, "Removal

and Installation"

 .

7. 

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-25, "CAN COMMUNICATION"

 .

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 

MTC-82,

"CONTROL UNIT"

 .

NG-2

>> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to 

BCS-27, "Removal

and Installation"

 .

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

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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 

MTC-83, "INTAKE SENSOR"

 .

11. 

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-25, "CAN COMMUNICATION"

 .

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 

MTC-102, "Removal

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 

PG-32, "Removal and

Installation of IPDM E/R"

 .

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

EC-493, "SYSTEM DESCRIPTION"

*3

ATC-5, "Contaminated Refrigerant"

*4

ATC-103, "PERFORMANCE TEST 
DIAGNOSES"

*5

ATC-105, "Test Reading"

*6

MA-13, "Checking Drive Belts"

WJIA1340E

TROUBLE DIAGNOSIS

MTC-71

C

D

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L

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A

B

MTC

2006 Pathfinder

PERFORMANCE TEST DIAGNOSES

*1

ATC-105, "PERFORMANCE 
CHART"

*2

ATC-105, "PERFORMANCE 
CHART"

*3

ATC-106, "Trouble Diagnoses for 
Unusual Pressure"

*4

ATC-63, "Air Mix Door Motor Circuit"

RJIA1601E

 

 

 

 

 

 

 

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