Infiniti FX35 / FX45. Manual — part 123
ATC-88
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
3.
Check continuity between ambient sensor harness connector
E34 terminal 1 and unified meter and A/C amp. harness connec-
tor M57 terminal 39.
4.
Check continuity between ambient sensor harness connector
E34 terminal 1 and ground.
OK or NG
OK
>> 1.
Replace unified meter and A/C amp.
2.
ATC-43, "Self-Diagnosis Function"
and perform self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
>> Repair harness or connector.
COMPONENT INSPECTION
Ambient Sensor
After disconnecting ambient sensor connector E34, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace ambient sensor.
In-vehicle Sensor Circuit
INFOID:0000000001328197
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor is located on instrument driver lower panel. It
converts variations in temperature of compartment air drawn from
the aspirator into a resistance value. It is then input into the unified
meter and A/C amp.
1 – 39
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA2019E
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
RJIA2020E
RJIA2021E
TROUBLE DIAGNOSIS
ATC-89
< SERVICE INFORMATION >
C
D
E
F
G
H
I
K
L
M
A
B
ATC
N
O
P
Aspirator
The aspirator is located on driver’s side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR
SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or
−
22 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1.
CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND
1.
Disconnect in-vehicle sensor connector.
2.
Turn ignition switch ON.
3.
Check voltage between in-vehicle sensor harness connector
M46 terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND UNIFIED METER AND A/C AMP.
1.
Turn ignition switch OFF.
2.
Disconnect unified meter and A/C amp. connector.
RJIA0921E
RJIA1804E
RJIA1452E
1 – Ground
: Approx. 5 V
RJIA2022E
ATC-90
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
3.
Check continuity between in-vehicle sensor harness connector
M46 terminal 2 and unified meter and A/C amp. harness con-
nector M57 terminal 49.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK IN-VEHICLE SENSOR
Refer to "In-vehicle Sensor".
OK or NG
OK
>> 1.
Replace unified meter and A/C amp.
2.
ATC-43, "Self-Diagnosis Function"
and perform self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
>> 1.
Replace in-vehicle sensor.
2.
ATC-43, "Self-Diagnosis Function"
and perform self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
4.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE 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 in-vehicle sensor harness connector
M46 terminal 1 and unified meter and A/C amp. harness con-
nector M57 terminal 40.
4.
Check continuity between in-vehicle sensor harness connector
M46 terminal 1 and ground.
OK or NG
OK
>> 1.
Replace unified meter and A/C amp.
2.
ATC-43, "Self-Diagnosis Function"
and perform self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
>> Repair harness or connector.
COMPONENT INSPECTION
In-vehicle Sensor
2 – 49
: Continuity should exist.
RJIA2023E
1 – 40
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA2024E
TROUBLE DIAGNOSIS
ATC-91
< SERVICE INFORMATION >
C
D
E
F
G
H
I
K
L
M
A
B
ATC
N
O
P
After disconnecting in-vehicle sensor connector M46, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace in-vehicle sensor.
Sunload Sensor Circuit
INFOID:0000000001328198
COMPONENT DESCRIPTION
Sunload Sensor
The sunload sensor is located on the passenger’s side front
defroster grille. It detects sunload entering through windshield by
means of a photo diode. The sensor converts the sunload into a cur-
rent value which is then input into the unified meter and A/C amp.
SUNLOAD INPUT PROCESS
The unified meter and A/C amp. also includes a processing circuit which averages the variations in detected
sunload over a period of time. This prevents drastic swings in the ATC system operation due to small or quick
variations in detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sunload sensor will vary whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sunload, and the system will react accord-
ingly.
DIAGNOSIS PROCEDURE FOR SUNLOAD 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
RJIA2025E
RJIA2026E
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