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Nissan Titan. Manual - part 390

INTAKE SENSOR

HAC-65

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

1. Turn ignition switch OFF.

2. Disconnect front air control connector.

3. Check continuity between intake sensor harness connector

M146 (B) terminal 1 and front air control harness connector M49

(A) terminal 26.

Is the inspection result normal?

YES

>> GO TO 3.

>> Repair harness or connector.

CHECK INTAKE SENSOR

Check intake sensor. Refer to

HAC-65, "Intake Sensor Component Inspection"

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to

VTL-8, "Removal and Installation"

2. Go to

HAC-21, "Front Air Control Self-Diagnosis"

and perform self-diagnosis.

>> 1. Replace intake sensor. Refer to

VTL-11, "Removal and Installation"

2. Go to

HAC-21, "Front Air Control Self-Diagnosis"

and perform self-diagnosis.

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 (B) terminal 2 and front air control harness connector M49

(A) terminal 11.

4. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and ground.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to

VTL-8, "Removal and Installation"

2. Go to

HAC-21, "Front Air Control Self-Diagnosis"

and perform self-diagnosis.

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000009882481

COMPONENT INSPECTION

Intake Sensor

1 - 26

: Continuity should exist.

AWIIA0434ZZ

2 - 11

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0435ZZ

HAC-66

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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

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

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-67

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000009882482

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 motors, 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.

Self-diagnostic functions are also built into the front air control 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 front air

control. 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.

Front Air Control Component Function Check

INFOID:0000000009882483

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE

1. Press AUTO switch.

2. 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.

>> Go to diagnosis procedure. Refer to

HAC-67, "Front Air Control Power and Ground Diagnosis

Procedure"

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009882484

Regarding Wiring Diagram information, refer to

HAC-71, "Wiring Diagram - Automatic Air Conditioner"

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA0551ZZ

AWIIA0938ZZ

HAC-68

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

SYMPTOM: A/C system does not come on.

CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch ON.

2. Check voltage between front air control harness connector M49

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

Is the inspection result normal?

YES

>> GO TO 2.

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

PG-77, "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.

CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connectors.

3. Check continuity between front air control harness connector

M50 terminal 35 and ground.

Is the inspection result normal?

>> Replace front air control. Refer to

VTL-8, "Removal and

Installation"

>> Repair harness or connector.

AWIIA0438GB

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

front air

control

connector

Terminal No.

M49

Ground

Approx. 0V

Battery
voltage

M50

Battery
voltage

AWIIA1073ZZ

35 - Ground

: Continuity should exist.

AWIIA0440ZZ

Content .. 388 389 390 391 ..