Nissan Altima L32. Instruction — part 819

HAC-50

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

AMBIENT SENSOR

Description

INFOID:0000000004498215

COMPONENT DESCRIPTION

Ambient Sensor

The ambient sensor (1) is attached on the front bumper reinforce-

ment. It detects ambient temperature and converts it into a resis-

tance value which is then input into the front air control.

AMBIENT TEMPERATURE INPUT PROCESS

The automatic amplifier includes a processing circuit for the ambient sensor input. However, when the temper-

ature detected by the ambient sensor increases quickly, the processing circuit retards the front air control func-

tion. It only allows the front air control to recognize an ambient temperature increase of 0.33

°C (0.6°F) per 100

seconds.

As an example, consider stopping for a cup of coffee after high speed driving. Although the actual ambient

temperature 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 grille area, location of the ambient sensor.

Diagnosis Procedure

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DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR

SYMPTOM: Ambient sensor circuit is open or shorted.

1.

CHECK VOLTAGE BETWEEN AMBIENT SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect ambient sensor connector.

2. Press ignition switch ON.

3. Check voltage between ambient sensor harness connector

E211 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> GO TO 4

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Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

5V

E211 - 1

RJIA0244E

AMBIENT SENSOR

HAC-51

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

2.

CHECK AMBIENT SENSOR GROUND CIRCUIT BETWEEN AMBIENT SENSOR AND IPDM E/R

1. Press ignition switch OFF.

2. Disconnect IPDM E/R connector E201.

3. Check continuity between IPDM E/R harness connector M201

(A) terminal 99 and ambient sensor harness connector E211 (B)

terminal 2.

If OK, check harness for short.
Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK AMBIENT SENSOR

Check ambient sensor. Refer to

HAC-51, "Component Inspection"

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> Replace ambient sensor. Refer to

HA-43, "Removal and Installation"

.

4.

CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND IPDM E/R

1. Press ignition switch OFF.

2. Disconnect IPDM E/R connector E201.

3. Check continuity between IPDM E/R harness connector E201

(A) terminal 100 and ambient sensor harness connector E211

(B) terminal 1.

If OK, check harness for short.
Is the inspection result normal?

YES

>> 1. Replace IPDM E/R. Refer to

PCS-48, "Removal and Installation"

.

2. Confirm system operation.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000004498217

Ambient Sensor

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

E201 - 99

E211-2

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Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

E201 - 100

E211 - 1

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HAC-52

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AMBIENT SENSOR

After disconnecting ambient sensor (1) harness connector E1, mea-

sure resistance between terminals 2 and 1 at sensor side, using the

table below.

If NG, replace ambient sensor. Refer to

HA-43, "Removal and Instal-

lation"

.

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

AWIIA0607ZZ

IN-VEHICLE SENSOR

HAC-53

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

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A

B

HAC

N

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IN-VEHICLE SENSOR

Component Description

INFOID:0000000004498218

In-vehicle sensor

The in-vehicle sensor (1) is located on instrument lower panel LH. It

converts variations in temperature of compartment air drawn from

the aspirator into a resistance value. It is then input into the front air

control.

Aspirator

The aspirator (1) is located on LH side of heater and cooling unit. It

produces vacuum pressure due to air discharged from the heater

and cooling unit, continuously taking compartment air in the aspira-

tor.

Diagnosis Procedure

INFOID:0000000004498219

DIAGNOSTIC PROCEDURE

SYMPTOM: In-vehicle sensor circuit is open or shorted.

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RHA482A

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