Nissan Altima L32. Instruction — part 821

HAC-58

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

SUNLOAD SENSOR

• When checking sunload sensor, select a place where sun shines directly on it.

SHA930E

INTAKE SENSOR

HAC-59

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

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F

G

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L

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A

B

HAC

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INTAKE SENSOR

Description

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Intake Sensor

The intake sensor is located on the heater and cooling unit. It converts temperature of air after it passes

through the evaporator into a resistance value which is then input to the front air control.

Diagnosis Procedure

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SYMPTOM: Intake sensor circuit is open or shorted.

1.

CHECK VOLTAGE BETWEEN INTAKE SENSOR HARNESS CONNECTOR AND BODY GROUND

1. Disconnect intake sensor connector M69.

2. Press ignition switch ON.

3. Check voltage between intake sensor connector M69 terminal 1

and ground.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> GO TO 4

2.

CHECK INTAKE SENSOR GROUND CIRCUIT BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A)

terminal 26 and intake sensor harness connector M69 (B) termi-

nal 4.

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

YES

>> GO TO 3

NO

>> Repair harness or connector.

3.

CHECK INTAKE SENSOR

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Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

5V

M69 - 1

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Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M37 - 26

M69 - 4

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HAC-60

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INTAKE SENSOR

Check intake sensor. Refer to

HAC-59, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> 1. Replace front air control. Refer to

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> 1. Replace intake sensor. Refer to

VTL-11, "Removal and Installation"

.

2. Confirm system operation.

4.

CHECK INTAKE SENSOR CIRCUIT BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

1. Press ignition switch OFF.

2. Disconnect front air control connector M37.

3. Check continuity between front air control connector M37 (A)

terminal 25 and intake sensor harness connector M69 (B) termi-

nal 1.

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

YES

>> 1. Replace front air control, Refer to

VTL-8, "Removal and Installation"

.

2. Confirm system operation.

NO

>> Repair harness or connector.

Component Inspection

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Intake Sensor

After disconnecting intake sensor harness connector, measure resistance between terminals 1 and 2 at sen-

sor harness side, using the table below.

If NG, replace intake sensor. Refer to

VTL-11, "Removal and Installation"

.

Terminals

Continuity

Connector - Terminal

Connector - Terminal

Yes

M69 - 1

M37 - 25

AWIIA0633ZZ

Temperature

°C (°F)

Resistance k

Ω

-15 (5)

12.34

-10 (14)

9.62

-5 (23)

7.56

0 (32)

6.00

5 (41)

4.80

10 (50)

3.87

15 (59)

3.15

20 (68)

2.57

25 (77)

2.12

30 (86)

1.76

35 (95)

1.47

40 (104)

1.23

45 (113)

1.04

POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

HAC-61

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL

Description

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COMPONENT DESCRIPTION

FRONT AIR CONTROL

The front air control has a built-in microcomputer which processes

information sent from various sensors needed for air conditioner

operation. The air mix door motors, mode door motor, intake door

motor, blower motor and compressor are then controlled.

Signals from various switches and Potentio Temperature Control

(PTC) are directly entered into front air control.

POTENTIO TEMPERATURE CONTROL (PTC)

The PTC is built into the front air control.

Component Function Check

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COMPONENT INSPECTION

SYMPTOM: A/C system does not come on.

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - AUTO MODE

1. Press AUTO switch (indicator should illuminate).

2. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower

speed will depend on ambient, in-vehicle and set temperature.)

Can a symptom be duplicated?

YES

>> GO TO 3

NO

>> GO TO 2

2.

PERFORM COMPLETE OPERATIONAL CHECK

Perform a complete operational check and check for any symptoms. Refer to

HAC-5, "Description and Condi-

tions"

.

Is the inspection result normal?

YES

>> Refer to

HAC-83, "Symptom Matrix Chart"

.

NO

>> System OK.

3.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 4

4.

CHECK MAIN POWER SUPPLY AND GROUND CIRCUIT

Check main power supply and ground circuit. Refer to

HAC-61, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace front air control. Refer to

VTL-8, "Removal and Installation"

.

NO

>> Repair as necessary.

Diagnosis Procedure

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DIAGNOSIS PROCEDURE FOR A/C SYSTEM

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