Nissan X-Trail 32. Manual - part 1390

SYSTEM

HAC-35

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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PTC HEATER CONTROL SYSTEM : Circuit Diagram

INFOID:0000000010941033

STOP/START SYSTEM

JMIIA3668GB

HAC-36

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

STOP/START SYSTEM : System Description

INFOID:0000000010939711

SYSTEM DIAGRAM

DESCRIPTION

• In the stop/start system, ECM performs integrated control based on the information from control units, sen-

sors and switches. For details, refer to 

EC-848, "STOP/START SYSTEM : System Description (M/T mod-

els)"

 (R9M M/T models) or 

EC-856, "STOP/START SYSTEM : System Description (CVT models)"

 (R9M

CVT models).

• A/C auto amp. transmits stop/start permit signal (permit) to ECM via CAN communication if it judges that the

comfort level in the passenger room can be maintained, even when engine stops while idling, based on each
sensor and the set temperature.

• A/C auto amp. receives operation status of stop/start system (stop/start status signal) from ECM via CAN

communication. When A/C auto amp. recognizes that stop/start system is operating based on the signal, it
changes control characteristics of air flow and inlet.

• When A/C auto amp. judges that the comfort level in the passenger room cannot be maintained while stop/

start function operates, it cancels stop/start permit signal (permit) and requests ECM to restart engine. Also,
when switch operation of A/C control (DEF switch) occurs, it also requests engine restart to ECM as well.

Stop/start Permission Condition Evaluated By A/C Auto Amp. (Before Stop/start Operation)

Before stop/start operation, when the following conditions are met, A/C auto amp. judges that stop/start sys-
tem operation is available and transmits stop/start permit signal to ECM via CAN communication.
• Outlet: Other than DEF (Enabled only when the ambient temperature is 25

°

C or less. When ambient temper-

ature is higher than 25

°

C (77

°

F), the outlet condition is not included in the conditions for judging that stop/

start is possible.)

• Air flow: Other than for maximum position
• Passenger room temperature: Becomes approx. 20

°

C (68

°

F) or more (when A/C switch is ON/OFF) or

approx. 30

°

C (86

°

F) or less (only when A/C switch is ON).

- When A/C switch is ON: 20

°

C (68

°

F) or more, and 30

°

C (86

°

F) or less.

- When A/C switch is OFF: 20

°

C (68

°

F) or more

NOTE:
When air conditioning system is OFF, it judges stop/start function is available at all times.

JMIIA3571GB

SYSTEM

HAC-37

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Stop/start Prohibition Condition Evaluated By A/C Auto Amp. (During Stop/start Operation)

During stop/start operation, when any of the following conditions is met, A/C auto amp. judges that stop/start
system operation is prohibited, cancels stop/start permit signal (inhibit), and requests ECM to restart engine.
• AUTO switch: Pressed
• A/C switch: Pressed.
• MAX DEF switch: Pressed [only when ambient temperature is 25

°

C (77

°

F) or less]

• Passenger room temperature: Becomes 20

°

C (68

°

F) or less (when A/C switch is ON/OFF) or 30

°

C (86

°

F) or

more (only when A/C switch is ON)

• Evaporator temperature: Becomes 16

°

C (60.8

°

F) or more (only when A/C switch is ON)

A/C CONTROL DURING STOP/START OPERATION

During stop/start operation, A/C auto amp. changes air flow and control characteristics of air inlet within a
range that does not adversely affect the comfort level, prolongs stop/start operation time and reduces power
consumption for improving fuel economy. Refer to the following items for details of each control.

Air Flow Control

Air flow reduction control during stop/start operation

• A/C auto amp increases voltage to power transistor gate compared to ordinary operation and reduces volt-

age to blower motor. This reduces air flow.

• Due to reduced airflow, the amount of air that passes evaporator is reduced. Increase of evaporator temper-

ature can be moderated. This helps prevent a rise in evaporator temperature from meeting the stop/start
prohibition condition, prolonging stop/start operation time.

• Also, by decreasing the voltage applied to blower motor, power consumption is reduced. This moderates

alternator power output after engine is restarted.

NOTE:
When the fan switch is operated while stop/start is operating, the air flow changes to the setting from before
stop/start is activated. (The air flow indicator also changes in the same way.)

Air Inlet Control

Air inlet change control during stop/start operation

• A/C auto amp. increases recirculation air mixing ratio compared to ordinary operation.
• By increasing recirculation air mixing ratio, cooled air in passenger room is circulated in larger amount than

during ordinary operation and increase of evaporator temperature can be moderated. This helps prevent
stop/start prohibition condition (evaporator temperature) from being met and prolongs stop/start operation
time.

HAC-38

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

SYSTEM

STOP/START SYSTEM : Circuit Diagram

INFOID:0000000010941034

JMIIA3669GB