Nissan Titan. Manual — part 390
INTAKE SENSOR
HAC-65
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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 M49
(A) terminal 26.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE SENSOR
Check intake sensor. Refer to
HAC-65, "Intake Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace intake sensor. Refer to
VTL-11, "Removal and Installation"
.
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
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 M49
(A) terminal 11.
4. Check continuity between intake sensor harness connector
M146 (B) terminal 2 and ground.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
Intake Sensor Component Inspection
INFOID:0000000009882481
COMPONENT INSPECTION
Intake Sensor
1 - 26
: Continuity should exist.
AWIIA0434ZZ
2 - 11
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0435ZZ
HAC-66
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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-11, "Removal and Installa-
.
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
WJIA1378E
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-67
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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:0000000009882482
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 motors, mode door motor, intake door
motor, defroster 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.
Self-diagnostic functions are also built into the front air control to pro-
vide quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
There are two PTCs (driver and passenger) built into the front air
control. They can be set at an interval of 0.5
°C (1.0°F) in the 18°C
(60
°F) to 32°C (90°F) temperature range by rotating the temperature
dial. The set temperature is displayed.
Front Air Control Component Function Check
INFOID:0000000009882483
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE
1. Press AUTO switch.
2. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle and set temperatures.)
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-67, "Front Air Control Power and Ground Diagnosis
.
Front Air Control Power and Ground Diagnosis Procedure
INFOID:0000000009882484
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
AWIIA0551ZZ
AWIIA0938ZZ
HAC-68
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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 ON.
2. Check voltage between front air control harness connector M49
(B) terminal 15 and M50 (A) terminal 27, 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
.
• 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. Disconnect front air control connectors.
3. Check continuity between front air control harness connector
M50 terminal 35 and ground.
Is the inspection result normal?
OK
>> Replace front air control. Refer to
NG
>> Repair harness or connector.
AWIIA0438GB
Terminals
Ignition switch position
(+)
(-)
OFF
ACC
ON
front air
control
connector
Terminal No.
M49
15
Ground
Approx. 0V
Approx. 0V
Battery
voltage
M50
27
Battery
voltage
Battery
voltage
Battery
voltage
AWIIA1073ZZ
35 - Ground
: Continuity should exist.
AWIIA0440ZZ
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