Nissan Titan. Manual - part 429

MAGNET CLUTCH

HAC-221

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

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HAC

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1. Reconnect BCM connector and front air control connector.

2. Turn ignition switch ON.

3. Check voltage between front air control harness connector

M177 terminal 36 and ground.

Is the inspection result normal?

YES

>> GO TO 12.

NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to 

VTL-8,

"Removal and Installation"

.

NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to 

BCS-52, "Removal

and Installation"

.

12.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-4, "System Description"

.

• BCM  –  ECM

• ECM – IPDM E/R

• ECM – Front air control
Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-28, "Removal and Installation of IPDM E/R"

.

NO

>> Repair or replace malfunctioning part(s).

Terminals

Condition

Voltage

(+)

(-)

front air con-

trol connector

Terminal No.

M177

36

Ground

A/C switch: ON
Blower motor 
operates

Approx. 0V

A/C switch: OFF

Approx. 5V

AWIIA0545ZZ

HAC-222

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

WATER VALVE CIRCUIT

WATER VALVE CIRCUIT

Description

INFOID:0000000009882594

COMPONENT DESCRIPTION

Water Valve

The water valve (1) cuts the flow of engine coolant to the heater core

to allow for maximum cooling during A/C operation. It is controlled by

the front air control.

Water Valve Diagnosis Procedure

INFOID:0000000009882595

Regarding Wiring Diagram information, refer to 

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

tem"

.

DIAGNOSTIC PROCEDURE FOR WATER VALVE

1.

CHECK WATER VALVE POWER AND GROUND CIRCUITS

1. Disconnect water valve connector F68.

2. Turn ignition switch ON.

3. Rotate temperature control dial to maximum heat.

4. Check voltage between water valve harness connector F68 ter-

minal 1 and terminal 2 while rotating temperature control dial to

maximum cold. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK WATER VALVE CONTROL OUTPUT CIRCUIT 

1. Turn ignition switch OFF.

2. Disconnect front air control connector M177.

3. Check continuity between water valve harness connector F68

(A) terminal 2 and front air control harness connector M177 (B)

terminal 30.

4. Check continuity between water valve harness connector F68

terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

WJIA1791E

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Water valve: F68

2 

1

Rotate temperature 

control dial

Battery 
voltage

WJIA1794E

2 - 30

: Continuity should exist.

2 - Ground

: Continuity should not exist.

AWIIA0546ZZ

WATER VALVE CIRCUIT

HAC-223

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

C

D

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F

G

H

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L

M

A

B

HAC

N

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NO

>> Repair harness or connector.

3.

CHECK WATER VALVE POWER AND GROUND CIRCUITS

1. Rotate temperature control dial to maximum cold.

2. Check voltage between water valve harness connector F68 ter-

minal 1 and terminal 2 while rotating temperature control dial to

maximum heat. 

Is the inspection result normal?

YES

>>  Replace the water valve. 

NO

>> GO TO 4.

4.

CHECK WATER VALVE CONTROL OUTPUT CIRCUIT 

1. Turn ignition switch OFF.

2. Disconnect front air control connector M177.

3. Check continuity between water valve harness connector F68

(A) terminal 1 and front air control harness connector M177 (B)

terminal 29.

4. Check continuity between water valve harness connector F68

(A) terminal 1 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

.

NO

>> Repair harness or connector.

Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

Water valve: F68

1 

2

Rotate temperature 

control dial

Battery 
voltage

WJIA1792E

1 - 29

: Continuity should exist.

1 - Ground

: Continuity should not exist.

AWIIA0547ZZ

HAC-224

< DTC/CIRCUIT DIAGNOSIS >

[MANUAL A/C (TYPE 2)]

INTAKE SENSOR

INTAKE SENSOR

System Description

INFOID:0000000009882596

COMPONENT DESCRIPTION

Intake Sensor

The intake sensor (1) is located on the heater & cooling unit assem-

bly. It converts temperature of air after if passes through the evapo-

rator into a resistance value which is then input to the front air

control.

Intake Sensor Diagnosis Procedure

INFOID:0000000009882597

Regarding Wiring Diagram information, refer to 

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

tem"

.

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

AWIIA1083ZZ

AWIIA0548GB

2 - Ground

: Approx. 5V

WJIA1375E