Nissan Pathfinder (2008 year). Manual — part 451

HAC-152

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

MAGNET CLUTCH

System Description

INFOID:0000000001366808

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).

Magnet Clutch Component Function Check

INFOID:0000000001366809

SYMPTOM: Magnet clutch does not engage.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1.

Rotate blower control dial clockwise.

2.

Rotate mode dial to vent (

) position.

3.

Press A/C switch. Confirm that the compressor clutch engages (sound or visual inspection).

Can the symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

HAC-123, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to

HAC-171, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK INTAKE SENSOR

Check and verify intake sensor circuit. Refer to

HAC-158, "Intake Sensor Component Inspection"

.

>> GO TO 5.

5.

RECHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Refer to

HAC-123, "Operational Check"

.

Does another symptom exist?

YES

>> Refer to

HAC-171, "Symptom Matrix Chart"

.

NO

>> Replace front air control. Refer to XX-XX, "*****".

Magnet Clutch Diagnosis Procedure

INFOID:0000000001366810

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

MAGNET CLUTCH

HAC-153

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

1.

PERFORM AUTO ACTIVE TEST

Refer to XX-XX.
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

HAC-134, "CONSULT-III Function (BCM)"

.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 8.

3.

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to

EC-412, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace refrigerant pressure sensor. Refer to XX-XX, .

4.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to

HAC-134, "CONSULT-III Func-

tion (BCM)"

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 5.

WJIA1490E

A/C SW ON

: COMP ON SIG ON

A/C SW OFF

: COMP ON SIG OFF

BLOWER CONTROL DIAL
ON

: FAN ON SIG ON

BLOWER CONTROL DIAL
OFF

: FAN ON SIG OFF

WJIA0469E

HAC-154

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

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.

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 XX-XX.

NG-1

>> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to XXXX.

NG-2

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

7.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to

LAN-14, "Trouble Diagnosis Flow Chart"

.

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.

A

B

Connector

Terminal Connector

Terminal

Continuity

BCM: M18

28

Front air control:

M49

18

Yes

WJIA1627E

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

WJIA1137E

MAGNET CLUTCH

HAC-155

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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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 XXX.

NG-2

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

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 XXXX.

OK or NG

OK

>> GO TO 11.

NG

>> Replace intake sensor. Refer to XXXX.

11.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to

LAN-14, "Trouble Diagnosis Flow Chart"

.

OK or NG

OK

>> Replace BCM. Refer to XX-XX, "*****".

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 XXX.

13.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR

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

27 - 10

: Continuity should exist.

WJIA1136E

WJIA1472E

HAC-156

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

MAGNET CLUTCH

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 XX-XX, "*****".

NG

>> Repair harness or connector.

11 – 1

: Continuity should exist.

WJIA1470E

INTAKE SENSOR

HAC-157

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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INTAKE SENSOR

System Description

INFOID:0000000001366821

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor is located on top of the heater and cooling unit
assembly next to the A/C evaporator cover. It converts temperature
of air after it passes through the evaporator into a resistance value
which is then input to the front air control.

Intake Sensor Diagnosis Procedure

INFOID:0000000001366822

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted.

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1.

Disconnect intake sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between intake sensor harness connector M146
terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between intake sensor harness connector
M146 terminal 1 and front air control harness connector M49 ter-
minal 13.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

WJIA1155E

WJIA1156E

2 - Ground

: Approx. 5V

WJIA1278E

1 - 13

: Continuity should exist.

WJIA1157E

HAC-158

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE SENSOR

3.

CHECK INTAKE SENSOR

Refer to

HAC-158, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to XXXX.

NO

>> Replace intake sensor. Refer to XXXX.

4.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between intake sensor harness connector
M146 terminal 2 and front air control harness connector M49 ter-
minal 12.

4.

Check continuity between intake sensor harness connector
M146 terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to XXXX.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000001366823

COMPONENT INSPECTION

Intake Sensor

After disconnecting intake sensor connector, measure resistance
between terminals 1 and 2 at sensor harness side, using the table
below.

If NG, replace intake sensor. Refer to XXXX.

2 - 12

: Continuity should exist.

2 - Ground

: Continuity should not exist.

WJIA1158E

Temperature

°

C (

°

F)

Resistance k

Ω

−

15 (5)

209.0

−

10 (14)

160.0

−

5 (23)

123.0

0 (32)

95.8

5 (41)

74.9

10 (50)

58.9

15 (59)

46.7

20 (68)

37.3

25 (77)

30.0

30 (86)

24.2

35 (95)

19.7

40 (104)

16.1

45 (113)

13.2

WJIA1159E

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-159

< COMPONENT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000001366824

COMPONENT DESCRIPTION

Front Air Control

The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor, mode door motor, intake door
motor, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to
hot or any intermediate position by rotating the temperature dial.

Front Air Control Component Function Check

INFOID:0000000001366825

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1.

Turn blower control dial to position 1-4, then press A/C switch.

2.

Confirm that the compressor clutch engages (sound or visual inspection).

Can a symptom be duplicated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to

HAC-123, "Operational Check"

.

Can a symptom be duplicated?

YES

>> Refer to

HAC-171, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK POWER AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to

HAC-160, "Front Air Control Power and Ground Diag-

nosis Procedure"

.

WJIA1302E

WJIA1311E