Nissan Titan. Manual - part 430

INTAKE SENSOR

HAC-225

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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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

M176 (A) terminal 21.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

Check intake sensor. Refer to 

HAC-225, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

NO

>> Replace intake sensor. Refer to 

VTL-11, "Removal and Installation"

.

4.

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

M176 (A) terminal 9.

4. Check continuity between intake sensor harness connector

M146 (B) terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000009882598

COMPONENT INSPECTION

Intake Sensor

1 - 21

: Continuity should exist.

AWIIA0549ZZ

2 - 9

: Continuity should exist.

2 - Ground

: Continuity should not exist.

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HAC-226

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INTAKE SENSOR

After disconnecting intake sensor (1) 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

AWIIA1084ZZ

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-227

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000009882599

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:0000000009882600

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

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

2. Press the A/C switch.

3. Confirm that the compressor clutch engages (sound or visual inspection). 
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-227, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009882601

Regarding Wiring Diagram information, refer to 

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

tem"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA0551ZZ

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HAC-228

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

SYMPTOM: A/C system does not come on.

1.

 CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL

1. Turn ignition switch OFF.

2. Disconnect front air control connectors.

3. Turn ignition switch ON.

4. Check voltage between front air control harness connector

M176 terminals 14, 22, 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. Check continuity between front air control harness connector

M176 terminal 1 and ground.

Is the inspection result normal?

OK

>> Replace front air control. Refer to 

VTL-8, "Removal and

Installation"

.

NG

>> Repair harness or connector.

WJIA0414E

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

front air 

control 

connector

Terminal No.

M176

14 

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

22

Battery 
voltage

Battery 
voltage

Battery 
voltage

AWIIA1087ZZ

1 - Ground

: Continuity should exist.

AWIIA0552ZZ