Nissan Xterra. Manual - part 460

HAC-38

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

INTAKE SENSOR

INTAKE SENSOR

System Description

INFOID:0000000009482484

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor is located on top of the heater and cooling unit

assembly next to the A/C evaporator cover. It converts temperature

of air after it passes through the evaporator into a resistance value

which is then input to the front air control.

Intake Sensor Diagnosis Procedure

INFOID:0000000009482485

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. 

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

1. Disconnect intake sensor connector.

2. Turn ignition switch ON.

3. Check voltage between intake sensor harness connector M146

terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

WJIA1155E

AWIIA0433GB

2 - Ground

: Approx. 5V

WJIA1278E

INTAKE SENSOR

HAC-39

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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 M50

(A) terminal 26.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

Refer to 

HAC-39, "Intake Sensor Component Inspection"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Replace intake sensor. Refer to 

VTL-8, "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 M50

(A) terminal 11.

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-7, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake Sensor Component Inspection

INFOID:0000000009482486

COMPONENT INSPECTION

Intake Sensor

1 - 26

: Continuity should exist.

AWIIA0434ZZ

2 - 11

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0435ZZ

HAC-40

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL 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-8, "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

WJIA1159E

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-41

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000009482487

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, 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. 

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 dial.

Front Air Control Component Function Check

INFOID:0000000009482488

SYMPTOM: A/C system does not come on. 

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1. Turn blower motor ON, then press A/C switch.

2. 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-41, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009482489

Regarding Wiring Diagram information, refer to 

HAC-45, "Wiring Diagram"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA1217ZZ

AWIIA0481ZZ