Nissan Titan. Instruction — part 429
MAGNET CLUTCH
HAC-221
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
.
NO-2 >> If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to
.
12.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
• 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 - Instruction With 3 Control Dial Sys-
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
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 - Instruction With 3 Control Dial Sys-
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
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