Nissan Xterra. Manual — part 460
HAC-38
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
INTAKE SENSOR
INTAKE SENSOR
System Description
INFOID:0000000009482484
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on top of the heater and cooling unit
assembly next to the A/C evaporator cover. It converts temperature
of air after it passes through the evaporator into a resistance value
which is then input to the front air control.
Intake Sensor Diagnosis Procedure
INFOID:0000000009482485
Regarding Wiring Diagram information, refer to
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
WJIA1155E
AWIIA0433GB
2 - Ground
: Approx. 5V
WJIA1278E
INTAKE SENSOR
HAC-39
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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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 M50
(A) terminal 26.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE SENSOR
HAC-39, "Intake Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Replace intake sensor. Refer to
VTL-8, "Removal and Installation"
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 M50
(A) terminal 11.
4. Check continuity between intake sensor harness connector
M146 (B) terminal 2 and ground.
Is the inspection result normal?
YES
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
NO
>> Repair harness or connector.
Intake Sensor Component Inspection
INFOID:0000000009482486
COMPONENT INSPECTION
Intake Sensor
1 - 26
: Continuity should exist.
AWIIA0434ZZ
2 - 11
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0435ZZ
HAC-40
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL 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
.
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
WJIA1159E
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-41
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component Description
INFOID:0000000009482487
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:0000000009482488
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK
1. Turn blower motor ON, 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-41, "Front Air Control Power and Ground Diagnosis
.
Front Air Control Power and Ground Diagnosis Procedure
INFOID:0000000009482489
Regarding Wiring Diagram information, refer to
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
AWIIA1217ZZ
AWIIA0481ZZ
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