Infiniti G35 (V35). Manual — part 108
TROUBLE DIAGNOSIS
ATC-103
C
D
E
F
G
H
I
K
L
M
A
B
ATC
In-vehicle Sensor Circuit
NJS0003R
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 display
and A/C auto amp.
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, continuously taking compartment air in the
aspirator.
RJIA3756E
RJIA0921E
RJIA1402E
ATC-104
TROUBLE DIAGNOSIS
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR
SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or
−
22 is
indicated on display and A/C auto 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
M42 terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND DISPLAY AND A/C AUTO
AMP.
1.
Turn ignition switch OFF.
2.
Disconnect display and A/C auto amp. connector.
3.
Check continuity between in-vehicle sensor harness connector
M42 terminal 2 and display and A/C auto amp. harness connec-
tor M31 terminal 40.
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
3.
CHECK IN-VEHICLE SENSOR
Refer to
OK or NG
OK
>> 1. Replace display and A/C auto amp.
2. Go to self-diagnosis
ATC-52, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
NG
>> 1. Replace in-vehicle sensor.
2. Go to self-diagnosis
ATC-52, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
RJIA3530E
1 – Ground
: Approx. 5 V
RJIA2022E
2 – 40
: Continuity should exist.
RJIA3531E
TROUBLE DIAGNOSIS
ATC-105
C
D
E
F
G
H
I
K
L
M
A
B
ATC
4.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND DISPLAY AND A/C AUTO
AMP.
1.
Turn ignition switch OFF.
2.
Disconnect display and A/C auto amp. connector.
3.
Check continuity between in-vehicle sensor harness connector
M42 terminal 1 and display and A/C auto amp. harness connec-
tor M31 terminal 18.
4.
Check continuity between in-vehicle sensor harness connector
M42 terminal 1 and ground.
OK or NG
OK
>> 1. Replace display and A/C auto amp.
2. Go to self-diagnosis
ATC-52, "FUNCTION CONFIRMATION PROCEDURE"
and perform self-
diagnosis STEP-2. Confirm that code No. 20 is displayed.
NG
>> Repair harness or connector.
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M42, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace in-vehicle sensor.
1 – 18
: Continuity should exist.
1 – Ground
: Continuity should not exist.
RJIA3532E
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
RJIA3757E
ATC-106
TROUBLE DIAGNOSIS
Sunload Sensor Circuit
NJS0003S
COMPONENT DESCRIPTION
Sunload Sensor
The sunload sensor is located on the driver’s side defroster grille. It
detects sunload entering through windshield by means of a photo
diode. The sensor converts the sunload into a current value which is
then input into the display and A/C auto amp.
SUNLOAD INPUT PROCESS
The display and A/C auto 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
SYMPTOM: Sunload sensor circuit is open or shorted. (25 or
−
25 is
indicated on display and A/C auto amp. as a result of performing
self-diagnosis STEP-2.)
1.
CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND
1.
Disconnect sunload sensor connector.
2.
Turn ignition switch ON.
3.
Check voltage between sunload sensor harness connector M18
terminal 1 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
RJIA0925E
RJIA3533E
1 – Ground
: Approx. 5 V
RJIA2027E
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