Infiniti FX35 / FX45. Manual - part 123

 

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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.

Go to self-diagnosis 

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

 

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.

Go to self-diagnosis 

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.

Go to self-diagnosis 

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.

Go to self-diagnosis 

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

 

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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