Nissan Frontier D40. Manual - part 735

INTAKE SENSOR

HAC-43

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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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 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-43, "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:0000000005275893

COMPONENT INSPECTION

Intake Sensor

1 - 26

: Continuity should exist.

AWIIA0434ZZ

2 - 11

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0435ZZ

HAC-44

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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-45

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

Component Description

INFOID:0000000005275894

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:0000000005275895

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-45, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000005275896

Regarding Wiring Diagram information, refer to 

HAC-50, "Wiring Diagram - Air Conditioner Control - With

VBC"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

AWIIA1217ZZ

AWIIA0481ZZ

HAC-46

< COMPONENT DIAGNOSIS >

[MANUAL A/C (TYPE 1)]

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 connector.

3.

Turn ignition switch ON.

4.

Check voltage between front air control harness connector M50
terminals 1 and 15, 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-79, "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
M50 terminal 13 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

AWIIA1218ZZ

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Front air 

control 

connector

Terminal No.

M50

15

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

M50

1 

Battery 
voltage

Battery 
voltage

Battery 
voltage

AWIIA1219ZZ

13 - Ground

: Continuity should exist.

AWIIA1220ZZ