Nissan Pathfinder (2007 year). Manual - part 59

TROUBLE DIAGNOSIS

ATC-123

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 Pathfinder

COMPONENT INSPECTION
Ambient Sensor 1

After disconnecting ambient sensor 1 (1) connector E1, measure
resistance between terminals 1 and 2 at sensor component side,
using the table below.

●

⇐

: Front

NOTE:
Both of the ambient sensors are located behind the front grille, below
the hood latch. The upper ambient sensor 1 (1) provides input for the
automatic A/C system. The lower ambient sensor 2 (2) provides
input for the compass/temperature driver information system.

If NG, replace ambient sensor 1.

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

WJIA1981E

ATC-124

TROUBLE DIAGNOSIS

2007 Pathfinder

In-vehicle Sensor Circuit

EJS004PI

COMPONENT DESCRIPTION
In-vehicle Sensor

The in-vehicle sensor is located on cluster lid D. It converts varia-
tions in temperature of passenger compartment air (drawn in through
the integrated fan) into a resistance value. It is then input into the
front air control.

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR

SYMPTOM: In-vehicle sensor circuit is out of range. (30 or 31 is indi-
cated on front air control display as a result of conducting self-diag-
nosis.)

1. 

CHECK IN-VEHICLE SENSOR CIRCUIT

Perform A/C system self-diagnosis. Refer to 

ATC-50, "A/C System Self-diagnosis Function"

 .

Is self-diagnosis code 30 or 31 present?

YES

>> GO TO 2.

NO

>> GO TO 6.

WJIA1145E

WJIA0606E

WJIA1146E

TROUBLE DIAGNOSIS

ATC-125

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 Pathfinder

2. 

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
M32 terminal 4 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 5.

3. 

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector M49.

3.

Check continuity between in-vehicle sensor harness connector
M32 terminal 1 and front air control harness connector M49 ter-
minal 13.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4. 

CHECK IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to 

ATC-126, "In-vehicle Sensor"

 .

OK or NG

OK

>> 1. Replace front air control. Refer to 

ATC-131, "FRONT AIR CONTROL"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

NG

>> 1. Replace in-vehicle sensor. Refer to 

ATC-133, "IN-VEHICLE SENSOR"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

5. 

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector.

3.

Check continuity between in-vehicle sensor harness connector
M32 terminal 4 and front air control harness connector M50 ter-
minal 27.

4.

Check continuity between in-vehicle sensor harness connector
M32 terminal 4 and ground.

OK or NG

OK

>> 1. Replace front air control. Refer to 

ATC-131, "FRONT AIR CONTROL"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

NG

>> Repair harness or connector.

4 - Ground

: Approx. 5V.

LJIA0089E

1 - 13

: Continuity should exist.

WJIA1147E

4 - 27

: Continuity should exist.

4 - Ground

: Continuity should not exist.

WJIA1148E

ATC-126

TROUBLE DIAGNOSIS

2007 Pathfinder

6. 

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND FRONT AIR CON-

TROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and in-vehicle sensor con-
nector.

3.

Check continuity between in-vehicle sensor harness connector
M32 terminal 2 and 3 and front air control harness connector
M50 terminal 34 and 33.

4.

Check continuity between in-vehicle sensor harness connector
M32 terminal 2 and 3 and ground.

OK or NG

OK

>> 1. Replace in-vehicle sensor. Refer to 

ATC-133, "IN-VEHICLE SENSOR"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis. If code still

exsists, GO TO 3.

3. Replace front air control. Refer to 

ATC-131, "FRONT AIR CONTROL"

 .

4. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

NG

>> Repair harness or connector.

COMPONENT INSPECTION
In-vehicle Sensor

After disconnecting in-vehicle sensor connector M32, measure resis-
tance between terminals 1 and 4 at sensor component side, using
the table below.

If NG, replace in-vehicle sensor.

2 - 34

: Continuity should exist.

3 - 33

: Continuity should exist.

2, 3 - Ground

: Continuity should not exist.

WJIA1149E

Temperature 

°

C (

°

F)

Resistance k

Ω

 

−

15 (5)

21.40

 

−

10 (14)

16.15

 

−

5 (23)

12.29

0 (32)

9.41

5 (41)

7.27

10 (50)

5.66

15 (59)

4.45

20 (68)

3.51

25 (77)

2.79

30 (86)

2.24

35 (95)

1.80

40 (104)

1.45

45 (113)

1.18

WJIA1150E

TROUBLE DIAGNOSIS

ATC-127

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 Pathfinder

Optical Sensor Circuit

EJS004PJ

COMPONENT DESCRIPTION

The optical sensor is located in the center of the 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 front air control.

OPTICAL INPUT PROCESS

The front air control includes a processing circuit which averages the variations in detected sunload over a
period of time. This prevents adjustments 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 optical 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.

DIAGNOSTIC PROCEDURE FOR OPTICAL SENSOR

SYMPTOM: Optical sensor circuit is open or shorted. (50 or 52 is
indicated on front air control display as a result of conducting self-
diagnosis).

WJIA1466E

WJIA1152E

ATC-128

TROUBLE DIAGNOSIS

2007 Pathfinder

1. 

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL

1.

Turn ignition switch OFF.

2.

Disconnect front air control connector and optical sensor con-
nector.

3.

Check continuity between optical sensor harness connector
M145 (B) terminal 1 and 2 and front air control harness connec-
tor M50 (A) terminal 37 and 29.

4.

Check continuity between optical sensor harness connector M145 (B) terminal 1 and 2 and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair harness or connector.

2. 

CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector and optical sensor connector.

3.

Check continuity between optical sensor harness connector
M145 (B) terminal 3 and BCM harness connector M18 (A) termi-
nal 18.

4.

Check continuity between optical sensor harness connector
M145 (B) terminal 3 and ground.

OK or NG

OK

>> Replace optical sensor. Refer to 

ATC-134, "OPTICAL SENSOR"

 .

NG

>> Repair harness or connector.

A

B

Connector

Terminal Connector

Terminal 

Continuity

Front air control: 

M50

29 

Optical sensor: 

M145

2

Yes

Front air control: 

M50

37 

Optical sensor: 

M145

1

Yes

B

Continuity

Connector

Terminal 

Ground

Optical sensor: 

M145

1 No

Optical sensor: 

M145

2 No

WJIA1654E

A

B

Connector

Terminal Connector

Terminal 

Continuity

BCM: M18

18 

Optical sensor: 

M145

3

Yes

B

Continuity

Connector

Terminal 

Ground

No

Optical Sensor: M145

3 

WJIA1655E

TROUBLE DIAGNOSIS

ATC-129

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2007 Pathfinder

Intake Sensor Circuit

EJS004PK

COMPONENT DESCRIPTION
Intake Sensor

The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the front air control.

DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR

SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indi-
cated on front air control display as a result of conducting self-diag-
nosis.)

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.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

2. 

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 terminal 1 and front air control harness connector M49 ter-
minal 13.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

WJIA1155E

WJIA1156E

2 - Ground

: Approx. 5V

WJIA1278E

1 - 13

: Continuity should exist.

WJIA1157E

ATC-130

TROUBLE DIAGNOSIS

2007 Pathfinder

3. 

CHECK INTAKE SENSOR

Refer to 

ATC-130, "Intake Sensor"

 .

OK or NG

OK

>> 1. Replace front air control. Refer to 

ATC-131, "FRONT AIR CONTROL"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

NG

>> 1. Replace intake sensor. Refer to 

ATC-135, "INTAKE SENSOR"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

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 terminal 2 and front air control harness connector M49 ter-
minal 12.

4.

Check continuity between intake sensor harness connector
M146 terminal 2 and ground.

OK or NG

OK

>> 1. Replace front air control. Refer to 

ATC-131, "FRONT AIR CONTROL"

 .

2. Go to 

ATC-50, "A/C System Self-diagnosis Function"

  and perform self-diagnosis.

NG

>> Repair harness or connector.

COMPONENT INSPECTION
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.

2 - 12

: Continuity should exist.

2 - Ground

: Continuity should not exist.

WJIA1158E

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