Nissan Frontier. Manual - part 872

 

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Nissan Frontier. Manual - part 872

 

 

HAC-42

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

Check continuity between terminals 3 and 5 and terminals 7 and 6

by supplying 12 volts and ground to coil side terminals 1 and 2 of the

relay.

Front Blower Motor

Confirm smooth rotation of the blower motor.

• Ensure that there are no foreign particles inside the blower unit.

• Apply 12 volts to terminal 2 and ground to terminal 1 and verify that the motor operates freely and quietly.

LJIA0068E

MAGNET CLUTCH

HAC-43

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

MAGNET CLUTCH

System Description

INFOID:0000000009478289

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.

Magnet Clutch Component Function Check

INFOID:0000000009478290

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 mode switch (

).

4. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge 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-43, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000009478291

Regarding Wiring Diagram information, refer to 

HAC-63, "Wiring Diagram - Automatic Air Conditioner"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

Ambient temperature 

°C (°F)

Compressor ON intake temperature 

°C 

(

°F)

Compressor OFF intake temperature 

°C (°F)

0 (32)

5.5 (42)

5.0 (41)

10 (50)

5.5 (42)

5.0 (41)

20 (68)

5.5 (42)

5.0 (41)

30 (86)

4.0 (39)

3.5 (38)

40 (104)

3.5 (38)

3.0 (37)

50 (122)

3.5 (38)

3.0 (37)

HAC-44

< 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-20, "Front Air Control Self-Diagnosis"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> • Malfunctioning intake sensor. Refer to 

HAC-56, "Intake Sensor Diagnosis Procedure"

.

• Malfunctioning ambient sensor. Refer to 

HAC-48, "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.

ALIIA0761GB

11 – 1

: Continuity should exist.

11 – ground

: Continuity should not exist.

WJIA0560E

MAGNET CLUTCH

HAC-45

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

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-28, "Removal and

Installation of IPDM E/R"

.

NO

>> Replace magnet clutch. Refer to 

HA-27, "Removal and

Installation for Compressor Clutch"

.

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to 

HAC-19, "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 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 27 and front air control harness connector M52 (B) termi-

nal 4.

4. Check continuity between BCM harness connector M18 (A) ter-

minal 27 and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

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 M52

terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

SJIA0197E

A/C SWITCH ON

:AIR COND SW ON

A/C SWITCH OFF

:AIR COND SW OFF

27 - 4

Continuity should exist.

27 - ground

Continuity should not exist.

AWIIA0416ZZ

Terminals

Condition

Voltage

(+)

(-)

Front air con-

trol connec-

tor

Terminal No.

M52

4

Ground

A/C switch: ON

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0417ZZ

 

 

 

 

 

 

 

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