Nissan Titan. Manual - part 411

INTAKE SENSOR

HAC-149

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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-150

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000009882543

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 motor, mode door motor, intake door

motor, defroster door motor, blower motor and A/C 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. 

Potentio Temperature Control (PTC)

The PTC is built into the front air control. It can be set from cold to

hot or any intermediate position by rotating the temperature control

dial. 

Front Air Control Component Function Check

INFOID:0000000009882544

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE

1. Turn the blower control dial clockwise to low speed.

2. Press the A/C Turn the blower control dial clockwise to low speed.

3. 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-150, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009882545

Regarding Wiring Diagram information, refer to 

HAC-155, "Wiring Diagram - Manual With 2 Control Dial Sys-

tem"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA0551ZZ

ALIIA0692ZZ

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-151

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

SYMPTOM: A/C system does not come on.

1.

 CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch ON.

2. Check voltage between front air control harness connector

M180 (B) terminal 15 and M181 (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-76, "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 FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connectors.

3. Check continuity between front air control harness connector

M181 terminal 35 and ground.

Is the inspection result normal?

OK

>> Replace front air control. Refer to 

VTL-8, "Removal and

Installation"

.

NG

>> Repair harness or connector.

AWIIA0438GB

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Front air 

control 

connector

Terminal No.

M180

15 

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

M181

27

Battery 
voltage

Battery 
voltage

Battery 
voltage

AWIIA1047ZZ

35 - Ground

: Continuity should exist.

AWIIA0440ZZ

HAC-152

< ECU DIAGNOSIS INFORMATION >

[MANUAL A/C (TYPE 1)]

MANUAL A/C IDENTIFICATION TABLE

ECU DIAGNOSIS INFORMATION

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000009882546

Manual A/C Type

Description

Visual Identification

Manual A/C (Type 1)

Two Control Dial System

Manual A/C (Type 2)

Three Control Dial System 

[with variable blower control 

(VBC)]

ALIIA0692ZZ

AWIIA0478ZZ