Infiniti G35 (V35) Sedan. Manual — part 780
HAC-92
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MAGNET CLUTCH
8.
CHECK ECM INPUT (FAN ON) SIGNAL
Check FAN ON/OFF signal. Refer to
HAC-49, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : CONSULT-III Function"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair harness or connector.
9.
CHECK CAN COMMUNICATION
Check CAN communication. Refer to
• ECM – IPDM E/R
• ECM – Unified meter and A/C amp.
Is the inspection result normal?
YES
>> Replace ECM.
NO
>> Repair or replace malfunctioning part(s).
Component Inspection
INFOID:0000000000959951
Refrigerant Pressure Sensor
The refrigerant pressure sensor (1) is attached to the liquid tank.
Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operating
condition figure. Refer to
.
FAN SW ON
: HEATER FAN SW ON
FAN SW OFF
: HEATER FAN SW OFF
JSIIA0045ZZ
SJIA1841E
AMBIENT SENSOR
HAC-93
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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AMBIENT SENSOR
Description
INFOID:0000000000959952
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 resis-
tance value which is then input into the unified meter and A/C amp.
Ambient Sensor Circuit
AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the
temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter
and A/C amp. function. It only allows the unified meter and A/C amp. to recognize an ambient temperature
increase of 0.33
°
C (0.6
°
F) per 100 seconds.
As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient tem-
perature 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 bumper area, location of the ambient sensor.
Component Function Check
INFOID:0000000000959953
1.
PERFORM SELF-DIAGNOSIS STEP-2
Perform self-diagnosis STEP-2. Refer to
HAC-44, "WITHOUT LEFT AND RIGHT VENTILATION TEMPERA-
TURE SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(Without left and right ventilation tempera-
ture separately control system) or
HAC-50, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE
SEPARATELY CONTROL SYSTEM : Diagnosis Description"
(With left and right ventilation temperature sepa-
rately control system), see No. 1 to 2.
21 or
−
21 is displayed.
YES
>> Go to Diagnosis Procedure. Refer to
.
NO
>> END.
Diagnosis Procedure
INFOID:0000000000959954
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1.
Disconnect ambient sensor connector.
2.
Turn ignition switch ON.
3.
Check voltage between ambient sensor harness connector E76 terminal 1 and ground.
JSIIA0046ZZ
RJIA4088E
HAC-94
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AMBIENT SENSOR
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
3.
Check continuity between ambient sensor harness connector E76 terminal 2 and unified meter and A/C
amp. harness connector M67 terminal 61.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AMBIENT SENSOR
HAC-94, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace unified meter and A/C amp.
NO
>> Replace ambient sensor.
4.
CHECK CIRCUIT CONTINUITY BETWEEN AMBIENT SENSOR AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
3.
Check continuity between ambient sensor harness connector E76 terminal 1 and unified meter and A/C
amp. harness connector M67 terminal 45.
4.
Check continuity between ambient sensor harness connector E76 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace unified meter and A/C amp.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000000959955
(+)
(
−
)
Voltage
Ambient sensor
—
Connector
Terminal
E76
1
Ground
Approx. 5 V
(+)
(
−
)
Continuity
ambient sensor
Unified meter and A/C amp.
Connector
Terminal
Connector
Terminal
E76
2
M67
61
Continuity should exist
(+)
(
−
)
Continuity
Ambient sensor
Unified meter and A/C amp.
Connector
Terminal
Connector
Terminal
E76
1
M67
45
Continuity should exist
(+)
(
−
)
Continuity
Ambient sensor
—
Connector
Terminal
E76
1
Ground
Continuity should not exist
AMBIENT SENSOR
HAC-95
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
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A
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HAC
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After disconnecting ambient sensor (1) connector E76, measure
resistance between terminals 1 and 2 at sensor side. Refer to table
below.
If NG, replace ambient sensor.
Temperature
°
C (
°
F)
Resistance k
Ω
−
15 (5)
12.73
−
10 (14)
9.92
−
5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
JSIIA0047ZZ
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