Nissan Titan. Instruction — part 387
MAGNET CLUTCH
HAC-53
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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 M49
terminal 5 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.
M49
5
Ground
A/C switch: ON
Blower motor
operates
Approx. 0V
A/C switch: OFF
Approx. 5V
AWIIA0419ZZ
HAC-54
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
WATER VALVE CIRCUIT
WATER VALVE CIRCUIT
Description
INFOID:0000000009882469
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:0000000009882470
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
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 (driver) to 32
°C (90°F).
4. Check voltage between water valve harness connector F68 ter-
minal 1 and terminal 2 while rotating temperature control dial
(driver) to 18
°C (60°F).
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 M50.
3. Check continuity between water valve harness connector F68
(A) terminal 2 and front air control harness connector M50 (B)
terminal 42.
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"
.
NO
>> Repair harness or connector.
WJIA1791E
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
Water valve: F68
2
1
Rotate temperature
control dial
Battery
voltage
WJIA1794E
2 - 42
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0420ZZ
WATER VALVE CIRCUIT
HAC-55
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
3.
CHECK WATER VALVE POWER AND GROUND CIRCUITS
1. Rotate temperature control dial (driver) to 18
°C (60°F).
2. Check voltage between water valve harness connector F68 ter-
minal 1 and terminal 2 while rotating temperature control dial
(driver) to 32
°C (90°F).
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 M50.
3. Check continuity between water valve harness connector F68
(A) terminal 1 and front air control harness connector M50 (B)
terminal 41.
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 - 41
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA0421ZZ
HAC-56
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
AMBIENT SENSOR
Component Description
INFOID:0000000009882471
COMPONENT DESCRIPTION
Ambient Sensor
The ambient sensor (1) is attached on the radiator core support (left
side). It detects ambient temperature and converts it into a value
which is then input into the front air control.
AMBIENT TEMPERATURE INPUT PROCESS
The front air control includes a processing circuit for the ambient sensor input. However, when the tempera-
ture detected by the ambient sensor increases quickly, the processing circuit retards the front air control func-
tion. It only allows the front air control to recognize an ambient temperature increase of 0.33
°C (0.6°F) per 100
seconds.
This prevents constant adjustments due to momentary conditions, such as stopping after high speed driving.
Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor
will increase. This is because the heat from the engine compartment can radiate to the front grille area, loca-
tion of the ambient sensor.
Ambient Sensor Diagnosis Procedure
INFOID:0000000009882472
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted. Using the
CONSULT, DTC B257B or B257C is displayed. Without CONSULT,
code 40 or 41 is indicated on front air control as a result of conduct-
ing the front air control self-diagnosis.
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
AWIIA1074ZZ
AWIIA0422GB
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