Nissan Pathfinder (2012 year). Manual - part 418

 

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Nissan Pathfinder (2012 year). Manual - part 418

 

 

HAC-66

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

19.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT VOLTAGE

Check voltage between A/C auto amp. harness connector M50 terminal 51 and ground while turning knob

between full cold and full hot.

Is the inspection result normal?

YES

>> GO TO 21.

NO

>> GO TO 20.

20.

CHECK REAR AIR CONTROL (REAR) AUX TEMP POT CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connector and rear air control (rear) connector.

3. Check continuity between A/C auto amp. harness connector M50 terminal 51 and rear air control (rear)

harness connector M208 terminal 7.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

21.

CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector M50 and the air mix door motor (rear) harness connec-

tor B155.

3. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and the air mix door

motor (rear) harness connector B155 terminal 1, 6.

4. Check continuity between A/C auto amp. harness connector M50 terminals 43, 44 and ground.

Is the inspection result normal?

YES

>> GO TO 22.

NO

>> Repair or replace harness as necessary.

22.

CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (REAR) POWER AND GROUND 

1. Reconnect A/C auto amp. harness connector.

2. Turn ignition switch ON.

3. Rotate temperature control dial (rear) to maximum hot.

4. Check voltage between A/C auto amp. harness connector M50 terminal 43 and terminal 44 while rotating

temperature control dial (rear) to maximum cold and back to maximum heat.

Connector

Terminals

Voltage (Ap-

prox.)

(+)

(-)

A/C auto amp.: M50

51

Ground

Varying be-

tween 0.1V and 

4.9V

Continuity should exist.

Connector

Terminal

Connector

Terminal

Continuity

M50

43

B155

1

Yes

44

6

Connector

Terminal

Continuity

M50

43

Ground

No

44

August 2012

2012 Pathfinder

REAR AIR CONTROL SYSTEM

HAC-67

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Is the inspection result normal?

YES

>> GO TO 23.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

23.

CHECK AIR MIX DOOR MOTOR (REAR) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connectors M49 and M50.

3. Check continuity between A/C auto amp. harness connector M49 terminal 3 and M50 terminal 28 and air

mix door motor (rear) harness connector B155 terminal 2, 3.

4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.

Is the inspection result normal?

YES

>> GO TO 24.

NO

>> Repair or replace harness as necessary.

24.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 

1. Check continuity between A/C auto amp. harness connector M50 terminal 30 and air mix door motor

(rear) harness connector B155 terminal 4.

2. Check continuity between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> GO TO 25.

NO

>> Repair or replace harness as necessary.

25.

CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIG-

NAL 

1. Reconnect A/C auto amp. harness connectors.

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M49 terminal 3, and M50 terminal 28.

Connector

Terminals

Condition Voltage 

(Approx.)

(+) (-)

M50

43

44

Rotate rear temperature control dial 

(rear) to maximum cold

Battery voltage

44

43

Rotate rear temperature control dial 

(rear) to maximum heat

Battery voltage

Connector

Terminal

Connector

Terminal

Continuity

M49

3

B155

2

Yes

M50

28

3

Connector

Terminal

Continuity

M49

3

Ground

No

M50

28

Connector

Terminal

Connector

Terminal

Continuity

M50

30

B155

4

Yes

Connector

Terminal

Continuity

M50

30

Ground

No

August 2012

2012 Pathfinder

HAC-68

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

4. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> GO TO 26.

NO

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

26.

CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL 

1. Reconnect the air mix door motor (rear) harness connector B155.

2. Check voltage between A/C auto amp. harness connector M50 terminal 30 and ground.

Is the inspection result normal?

YES

>> Inspect air mix door (rear) for binding or mechanical failure. If air mix door (rear) moves freely,

replace A/C auto amp. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace the air mix door motor (rear). Refer to 

VTL-30, "Removal and Installation"

.

Connector

Terminals

Connector

Terminals

Voltage (Approx.)

(+)

(-) 

M50

28

M49

3

5V

Connector

Terminal

Voltage (Approx.)

M50

30

Ground

0V

Connector

Terminal

Voltage (Approx.)

M50

30

Ground

0.1 to 4.9V

August 2012

2012 Pathfinder

MAGNET CLUTCH

HAC-69

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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MAGNET CLUTCH

System Description

INFOID:0000000007356377

SYSTEM DESCRIPTION

The A/C auto amp. controls compressor operation based on ambient and intake temperature and a signal

from ECM.

Low Temperature Protection Control

The A/C auto amp. 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.

Magnet Clutch Component Function Check

INFOID:0000000007356378

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Turn ignition switch ON.

2. Press the A/C switch.
3. Press vent switch (

).

4. Display shows 

, A/C. Confirm that the compressor clutch engages (sound or visual inspection). (Dis-

charge air and blower speed will depend on ambient, in-vehicle and set temperatures.)

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-69, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000007356379

Regarding Wiring Diagram information, refer to 

HAC-95, "Wiring Diagram - Automatic"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

Ambient temperature 

°

(

°

F)

VK56DE Model

VQ40DE Model

Compressor ON             

intake temperature 

°

(

°

F)

Compressor OFF             

intake temperature 

°

(

°

F)

Compressor ON             

intake temperature 

°

(

°

F)

Compressor OFF             

intake temperature 

°

(

°

F)

0 (32)

6.0 (43)

5.5 (42)

5.5 (42)

5.0 (41)

10 (50)

5.0 (41)

5.0 (41)

4.5 (40)

4.5 (40)

20 (68)

3.5 (38)

3.0 (37)

3.0 (37)

2.5 (37)

30 (86)

3.0 (37)

2.5 (37)

2.5 (37)

1.5 (35)

40 (104)

3.0 (37)

2.5 (37)

2.0 (36)

1.0 (34)

50 (122)

3.0 (37)

2.5 (37)

2.0 (36)

1.0 (34)

August 2012

2012 Pathfinder

HAC-70

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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 

HAC-24, "A/C Auto Amp. Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> • Malfunctioning intake sensor. Refer to 

HAC-87, "Intake Sensor Diagnosis Procedure"

.

• Malfunctioning ambient sensor. Refer to 

HAC-79, "Ambient Sensor Diagnosis Procedure"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-9, "Diagnosis Description"

.

Does magnet clutch operate?

YES

>> •

WITH CONSULT

GO TO 5.

WITHOUT CONSULT

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 A/C compressor harness

connector F3 terminal 1.

4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

AWIIA0198GB

11 – 1

: Continuity should exist.

11 – 1

: Continuity should not exist.

August 2012

2012 Pathfinder

MAGNET CLUTCH

HAC-71

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Check for operation sound when applying battery voltage direct cur-

rent to terminal.
Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and

Installation of IPDM E/R"

.

NO

>> Replace magnet clutch. Refer to 

HA-40, "Removal and

Installation for Compressor Clutch"

.

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to 

BCS-23, "AIR CONDITIONER : CONSULT Function (BCM - AIR

CONDITIONER)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 6.

6.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.

1. Turn ignition switch OFF.

2. Disconnect BCM connector and A/C auto amp. connector.

3. Check continuity between BCM harness connector M18 terminal 27 and A/C auto amp. harness connec-

tor M49 terminal 4.

4. Check continuity between BCM harness connector M18 terminal 27 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK VOLTAGE FOR A/C AUTO AMP. (A/C COMPRESSOR ON SIGNAL)

1. Reconnect BCM connector and A/C auto amp. connector.

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M49

terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace A/C auto amp. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to 

BCS-53, "Removal

and Installation"

.

SJIA0197E

A/C SW ON

: AIR COND SW ON

A/C SW OFF

: AIR COND SW OFF

27 - 4

Continuity should exist.

27 - ground Continuity should not exist.

Terminals

Condition

Voltage

(+)

(-)

A/C auto 

amp. con-

nector

Terminal No.

M49

4

Ground

A/C switch: ON

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0200ZZ

August 2012

2012 Pathfinder

HAC-72

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

MAGNET CLUTCH

8.

CHECK REFRIGERANT PRESSURE SENSOR

1. Start engine.

2. Check voltage between ECM harness connector F54 (VQ40DE)

or F79 (VK56DE) terminal 70 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Refer to 

EC-423, "Diagnosis Procedure"

 (VQ40DE) or 

EC-944, "Diagnosis Procedure"

 (VK56DE).

9.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to 

BCS-23, "AIR CONDITIONER : CONSULT Function (BCM - AIR CONDI-

TIONER)"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 10.

10.

CHECK CIRCUIT CONTINUITY BETWEEN BCM AND A/C AUTO AMP.

1. Turn ignition switch OFF.

2. Disconnect BCM connector and A/C auto amp. connector.

3. Check continuity between BCM harness connector M18 terminal 28 and A/C auto amp. harness connec-

tor M49 terminal 5.

4. Check continuity between BCM harness connector M18 terminal 28 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK VOLTAGE FOR A/C AUTO AMP. (FAN ON SIGNAL)

1. Reconnect BCM connector and A/C auto amp. connector.

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M49

terminal 5 and ground.

Terminals

Condition

Voltage

(+)

(-)

ECM connector

Terminal 

No.

F54 (VQ40DE)

F79 (VK56DE)

70

Ground

A/C switch: ON

Approx. 0.36 - 3.88V

LJIA0124E

FRONT BLOWER CONTROL 
DIAL ON

: FAN ON SIG ON

FRONT BLOWER CONTROL 
DIAL OFF

: FAN ON SIG OFF

28 - 5

Continuity should exist.

28 - ground Continuity should not exist.

AWIIA0202ZZ

August 2012

2012 Pathfinder

MAGNET CLUTCH

HAC-73

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Is the inspection result normal?

YES

>> GO TO 12.

NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace A/C auto amp. Refer to 

VTL-7,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

BCS-53, "Removal

and Installation"

.

12.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

• BCM  –  ECM

• ECM – IPDM E/R

• ECM – A/C auto amp.
Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and Installation of IPDM E/R"

.

NO

>> Repair or replace malfunctioning part(s).

Terminals

Condition

Voltage

(+)

(-)

A/C auto amp. 

connector

Terminal No.

M49

5

Ground

A/C switch: ON
Blower motor 
operates

Approx. 0V

A/C switch: OFF

Approx. 5V

August 2012

2012 Pathfinder

 

 

 

 

 

 

 

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