Nissan Altima HL32 Hybrid. Manual - part 502

INTAKE DOOR CONTROL SYSTEM

HAC-29

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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Intake door position is basically fixed at FRE when FRE indicator

lamps of DEF switch and intake switch turn ON, and fixed at REC

when REC indicator lamp of intake switch turns ON.

Intake door automatic control selects FRE, 20%FRE, or REC

depending on a target air mix door opening angle, based on in-vehi-

cle temperature, ambient temperature, and sunload.

RHA383H

HAC-30

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

BLOWER MOTOR CONTROL SYSTEM

Description

INFOID:0000000004215307

SYSTEM DESCRIPTION

Component Parts

Fan speed control system components are:

• Auto amp.

• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)

• In-vehicle sensor

• Ambient sensor

• Sunload sensor

• Intake sensor

System Operation

Blower motor circuit

Automatic Mode

In the automatic mode, the blower motor speed is calculated by the auto amp. based on the input from the

PBR, in-vehicle sensor, sunload sensor, intake sensor and ambient sensor.

When the air flow is increased, the duty ratio of the blower fan motor’s drive signal is changed at 8%/sec. to

prevent a sudden increase in air flow.

In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low

water temperature starting control and high passenger compartment temperature starting control are avail-

able.

Starting Fan Speed Control

Start up from COLD SOAK Condition (Automatic mode)

In a cold start up condition where the engine coolant temperature is below 56

°C (133°F), the blower will not

operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the

ambient and engine coolant temperature.

JPIIA0020GB

JPIIA0022GB

BLOWER MOTOR CONTROL SYSTEM

HAC-31

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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In the most extreme case (very low ambient) the blower starting delay will be 150 seconds as described

above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above

56

°C (133°F), and then the blower speed will increase to the objective speed.

Start up from usual or HOT SOAK Condition (Automatic mode)

The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed will gradu-

ally rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective

blower speed).

Blower Speed Compensation

Sunload

When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low

speed. The low speed will vary depending on the sunload. During conditions of low or no sunload, the blower

speed is at duty ratio 25%. During high sunload conditions, the auto amp. raise the blower speed (duty ratio

41%).

Fan Speed Control Specification

JPIIA0021GB

HAC-32

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ELECTRIC COMPRESSOR CONTROL SYSTEM

ELECTRIC COMPRESSOR CONTROL SYSTEM

Description

INFOID:0000000004215308

SYSTEM DESCRIPTION

• The auto amp. calculates the target speed of the compressor based on the target evaporator temperature

(which is calculated by the in-vehicle sensor, ambient sensor, and the sunload sensor) and the actual evap-

orator temperature that is detected by the intake sensor in order to control the compressor speed.

• The auto amp. calculates the target evaporator temperature, which includes corrections based on the in-

vehicle sensor, ambient sensor, the sunload sensor, and intake sensor. Accordingly, the auto amp. controls

the compressor speed to an extent that would not inhibit the proper cooling performance or defogging per-

formance.

Electric Compressor Circuit

JSIIA0309GB