Nissan Frontier. Instruction — part 910

HAC-194

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INTAKE SENSOR

If NG, replace intake sensor. Refer to

VTL-10, "Removal and Installation"

.

40 (104)

16.1

45 (113)

13.2

Temperature

°C (°F)

Resistance k

Ω

POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER

HAC-195

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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:0000000009478404

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:0000000009478405

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK

1. Turn blower control dial to position 1-4, 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-195, "Front Air Control Power and Ground Diagnosis

Procedure"

.

Front Air Control Power and Ground Diagnosis Procedure

INFOID:0000000009478406

Regarding Wiring Diagram information, refer to

HAC-200, "Wiring Diagram - With Type 2"

.

DIAGNOSTIC PROCEDURE FOR A/C SYSTEM

WJIA1302E

AWIIA1228ZZ

HAC-196

< 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 connector.

3. Turn ignition switch ON.

4. Check voltage between front air control harness connector M49

terminals 6 and 19, 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

M49 terminal 20 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to

VTL-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

WJIA1461E

Terminals

Ignition switch position

(+)

(-)

OFF

ACC

ON

Front air

control

connector

Terminal No.

M49

6

Ground

Approx. 0V

Approx. 0V

Battery
voltage

M49

19

Battery
voltage

Battery
voltage

Battery
voltage

WJIA1082E

20 - Ground

: Continuity should exist.

WJIA1239E

MANUAL A/C IDENTIFICATION TABLE

HAC-197

< ECU DIAGNOSIS INFORMATION >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS INFORMATION

MANUAL A/C IDENTIFICATION TABLE

Application Table

INFOID:0000000009478407

Instruction A/C Type

Description

Visual Identification

Instruction A/C (Type 1)

Two Control Dial System

[with variable blower control

(VBC)]

Instruction A/C (Type 2)

Three Control Dial System

[without variable blower con-

trol (VBC)]

AWIIA0481ZZ

AWIIA1228ZZ