Nissan Titan. Manual - part 428

 

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Nissan Titan. Manual - part 428

 

 

MAGNET CLUTCH

HAC-217

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

MAGNET CLUTCH

System Description

INFOID:0000000009882591

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.

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.

Magnet Clutch Component Function Check

INFOID:0000000009882592

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - MAGNET CLUTCH

1. Turn ignition switch ON.

2. Turn the blower control dial to low speed and press the A/C switch.
3. Rotate mode control dial to vent mode (

).

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-217, "Magnet Clutch Diagnosis Procedure"

.

Magnet Clutch Diagnosis Procedure

INFOID:0000000009882593

Regarding Wiring Diagram information, refer to 

HAC-232, "Wiring Diagram - Manual With 3 Control Dial Sys-

tem"

.

DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH

HAC-218

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MAGNET CLUTCH

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

1.

CHECK INTAKE SENSOR CIRCUIT

Check intake sensors. Refer to 

HAC-225, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check malfunctioning intake sensor. Refer to 

HAC-224, "Intake Sensor Diagnosis Procedure"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to 

PCS-11, "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.

WJIA1392E

11 – 1

: Continuity should exist.

11 – ground

: Continuity should not exist.

WJIA0560E

MAGNET CLUTCH

HAC-219

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

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F

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HAC

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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-33, "Removal and

Installation"

.

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to 

BCS-21, "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 M176 (B) termi-

nal 12.

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

M176 terminal 12 and ground.

Is the inspection result normal?

YES

>> GO TO 8.

SJIA0197E

A/C SW ON

: AIR COND SW ON

A/C SW OFF

: AIR COND SW OFF

27 - 12

Continuity should exist.

27 - ground

Continuity should not exist.

AWIIA0542ZZ

Terminals

Condition

Voltage

(+)

(-)

front air con-

trol connec-

tor

Terminal No.

M176

12

Ground

A/C switch: ON

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0543ZZ

HAC-220

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

MAGNET CLUTCH

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

VTL-8,

"Removal and Installation"

.

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

BCS-52, "Removal

and Installation"

.

8.

CHECK REFRIGERANT PRESSURE SENSOR

1. Start engine.

2. Check voltage between ECM harness connector F54 terminal

70 and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Refer to 

EC-481, "Diagnosis Procedure"

.

9.

CHECK BCM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to 

BCS-21, "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 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 M177 (B) termi-

nal 36.

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

minal 28 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair harness or connector.

11.

CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

Terminals

Condition

Voltage

(+)

(-)

ECM con-

nector

Terminal No.

F54

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 - 36

Continuity should exist.

28 - ground

Continuity should not exist.

AWIIA0544ZZ

 

 

 

 

 

 

 

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