Infiniti QX56 (JA60). Manual — part 607

INTAKE SENSOR

HAC-85

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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

VTL-11, "Removal and Installa-

tion"

.

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

WJIA1378E

HAC-86

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000005147729

COMPONENT DESCRIPTION

A/C auto amp.

The A/C auto amp. has a built-in microcomputer which processes

information sent from various sensors needed for air conditioner

operation. The air mix door motors, mode door motor, intake door

motor, defroster door motor, blower motor and compressor are then

controlled.

The A/C auto amp. is unitized with control mechanisms. When the

various switches and temperature dials are operated, data is input to

the A/C auto amp.

Self-diagnostic functions are also built into the A/C auto amp. to pro-

vide quick check of malfunctions in the auto air conditioner system.

Potentio Temperature Control (PTC)

There are two PTCs (driver and passenger) built into the A/C auto

amp. They can be set at an interval of 0.5

°C (1.0°F) in the 18°C

(60

°F) to 32°C (90°F) temperature range by rotating the temperature

dial. The set temperature is displayed.

A/C Auto Amp. Component Function Check

INFOID:0000000005147730

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE

1. Press AUTO switch.

2. Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).

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

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-4, "Operational Check

(Front)"

.

Can a symptom be duplicated?

YES

>> Refer to

HAC-3, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4.

4.

CHECK POWER AND GROUND CIRCUIT

AWIIA0573ZZ

AWIIA0211GB

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-87

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Check main power supply and ground circuit. Refer to

HAC-87, "A/C Auto Amp Power and Ground Diagnosis

Procedure"

.

Is the inspection result normal?

YES

>> System OK.

NO

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and Installation"

.

A/C Auto Amp Power and Ground Diagnosis Procedure

INFOID:0000000005147731

Regarding Wiring Diagram information, refer to

HAC-91, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

SYMPTOM: A/C system does not come on.

1.

CHECK POWER SUPPLY CIRCUITS FOR A/C AUTO AMP.

1. Turn ignition switch ON.

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

(B) terminal 15 and M50 (A) terminal 27, and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to

PG-69, "Terminal

Arrangement"

.

• If fuses are OK, check harness for open circuit. Repair or replace as necessary.

• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-

sary.

2.

CHECK GROUND CIRCUIT FOR A/C AUTO AMP.

AWIIA0212GB

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

A/C auto

amp. con-

nector

Terminal No.

M49

15

Ground

Approx. 0V

Approx. 0V

Battery
voltage

M50

27

Battery
voltage

Battery
voltage

Battery
voltage

AWIIA1073ZZ

HAC-88

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. connectors.

3. Check continuity between A/C auto amp. harness connector

M50 terminal 36 and ground.

Is the inspection result normal?

OK

>> Replace A/C auto amp. Refer to

VTL-7, "Removal and

Installation"

.

NG

>> Repair harness or connector.

36 - Ground

: Continuity should exist.

AWIIA0214ZZ